Lunkenheimer Cylinder Lubricators
IMPROVED "SENIOR" SIGHT-FEED LUBRICATOR.
A-Oil Reservoir. B-Upper Valve. C-Valve for regulating flow of oil. D-Discharge Valve. E-Drain Valve. F-FillingPlug. H-Sight-feed Glass. I-Valve to drain or blow out Sight-feed Glass H. J-Indicator Glass. K-Plug to replace or cleanse Indicator Glass J. L-Plug to replace or cleanse Sight-feed Glass H.
This lubricator has special features and advantages not found in Other makes. We have dispensed with the use of a condensing chamber or bulb, owing to its liability to freeze and consequent bursting. The filling plug has been placed directly on top of the oil reservoir or chamber, which makes the cup easy to fill. The sight-feed and indicator glasses, when broken, can be easily replaced by removing plugs K or L, and the sight-feed is provided with a vent plug, by means of which steam can be blown through the glass to clean it. The connection shanks on the 1/4, 1/3 and 1/2-pint sizes are threaded for %-inch pipe instead of 1/2-inch consequently, cups of these sizes can be attached to small steam pipes.
These advantages. combined with neat design, superior workmanship and finish, make the "Senior" the most modern and efficient sight-feed lubricator on the market. Every cup is tested and warranted.
DIRECTIONS FOR CONNECTING AND OPERATING.
Drill and tap steam pipe above the throttle valve to receive oil discharge shank, and higher up for 1/4-inch -inch pipe thread for condenser pipe and angle valve.
To fill, close valves B, C and D.
Drain the lubricator by opening valve E. Close valve E and fill (full) with oil at F.
After filling, open valve D (slowly) and wait until sight-feed glass H has filled with water by condensation, then open valve B slowly and regulate the oil drops with valve C.
After the first filling with oil, valve D need not be closed; as long as glass tube H is full of clear water, it is only necessary to close valves B and C to refill.
The bottom sight-feed glass fitting is provided with a drain valve for blowing out or draining sight-feed glass.
Indicator glass j shows the quantity of oil in the oil reservoir.
If indicator glass J, or sight-feed glass H should break. they can be replaced by unscrewing plugs K or L and slipping new glasses through from the top.
Lubricators are sent without Condenser Pipes and Angle Valves unless otherwise ordered. They are neatly packed in wooden boxes with sliding lids.
"JUNIOR" SINGLE CONNECTION SIGHT-FEED LUBRICATOR.
M-Oil Reservoir. N-Steam Valve. O-Oil Regulating Valve. P-Plug to replace or cleanse glass. R-Drain Valve. S-Valve for draining sight-feed glass. T-Filling Plug. U-Sight-feed Glass. V-Condensing Chamber. W-Bent Condenser Pipe.
The "Junior" has been designed to meet the demand for a simple, reliable and inexpensive single connection sight-feed lubricator for small engines, portables, steam inexpensive pumps and locomotive air brakes. It has but two valves, steam valve N and oil regulating valve 0.
The "Junior" can be attached to steam pipe or chest; if to steam pipe, it is preferable to connect same on boiler side of throttle; if placed on steam chest, attach it on top of same by using a short piece of vertical pipe and elbow. The working of the cup is not affected by turning steam on or off. In attaching, see that hole in steam pipe is tapped straight, allowing shank to stand exactly horizontal.
Use good cylinder oil and feed about four drops per minute. To clean glass tube remove plug P, using cotton waste on a piece of wood (not iron wire). To prevent freezing, the cup can be drained by closing valve N and opening drain valve R. Keep stuffing-boxes tight, as leakage prevents perfect working of cup.
The "Junior" is the only single connection sight-feed lubricator thus far placed on the market giving satisfaction, and is covered by patents. Many thousands are in use, and infringements and imitations are offered. We warn users against these. Insist on getting the genuine; they cost no more. Every cup is plainly marked with "Junior," our name and patent stamp.
TO FILL AND OPERATE.
Close valves N and 0, drain cup at R, and fill (full) with oil. Then open valve N slowly. When glass tube has filled with water, regulate oil drops at 0.
While cup is working, leave steam valve N wide open, unless pulsation interferes with oil drops, in which case regulate to suit. Valve S should only be opened when it becomes necessary to blow out or drain sight-feed glass.
1/4 and 1/3-pint sizes are also made with 1/2-inch pipe shank, but will be sent with %-inch pipe unless otherwise specified. These Lubricators can be furnished with glass gauge to indicate quantity of oil in reservoir, at an extra charge of 50 cents each net, but will be sent without unless specially ordered. Where sizes larger than 1/2-pint are wanted, we recommend our "Senior," pages 328 and 329. See pages 332 and 333 for price list of repairs.
DOUBLE SIGHT-FEED LUBRICATOR.
This Lubricator is designed for use on compound engines and is fully warranted to fulfil] the requirements of such service. Especial attention is called to its simplicity of construction and neat design. It is provided with equalizing tubes fitted with regulating Ives, so that variations in pressure may be properly equalized (preventing
"syphoning" of the oil) and it has many other important features exclusive with this lubricator. Owing to the variety of methods employed in connecting lubricators of this kind, we make them in several styles, viz.: with brace-stud and locknut at back or bottom, and with vertical or horizontal stand. In ordering, always specify which style of support is desired, and if wanted with stand, give height and base diameter of same. Cups furnished with stands are charged at a slightly higher price than those with brace studs.
Attach the cup securely to the engine in whatever manner most convenient and accessible. Then connect top live steam connection to steam pipe above lubricator, and oil discharge ends to tubes connecting with center of steam chests of cylinders.
To fill, close water and oil discharge valves and fill reservoir with oil. Open oil discharge valves and allow sight-feed glasses to fill with water, then open water valve and regulate feed of oil with oil regulating valves. Before refilling, drain water from cup by means of drain valve at bottom of reservoir. In some cases, it may be necessary to regulate oil discharge valves to insure cup working to best advantage. Broken glasses can easily be replaced by taking off plugs 0.
On all sizes of cups, the unions at top of condenser connection, and on oil delivery connections have 3/8-inch female pipe thread.
"MAJOR" SIGHT-FEED LUBRICATOR.
A-Reservoir. B-Steam Valve. C-Oil Regulating Valve. F-Drain Valve. H-Bull's Eye Sight-feed.
Lunkenheimer "Major" Lubricator is a down-drop cup of compact and simple construction, suitable for steam pumps and small engines, and should be placed on the steam Jest. This cup is provided with our Improved "Bull's Eye" sight-feed. When a glass breaks, remove the glass holder with a wrench, insert a new glass and replace holder. These glasses are very strong and thick and of superior grade, and seldom have to be renewed.
After the cup is attached to steam chest, close steam valve B and oil regulating valve C, and fill the cup with oil. Then open steam valve B (slowly) and regulate flow of oil with C; do not feed too fast, as time must be allowed for condensation. When cup requires refilling, close valves B and C, drain the cup at F and fill with oil, then proceed as before.
Lunkenheimer "Independent" Sight-feeds are intended to be used in connection with closed pressure tank systems for the purpose of supplying oil-to steam chest. and cylinders of steam engines. This method of lubrication is often used where a number of engines are in close proximity to each other, and the oil for all is supplied from a centrally located tank under pressure.
The plain device, Fig. 494, is intended for use on simple engines, and should be connected above the throttle valve.
The device with Equalizing Attachment, Fig. 683, can be attached on the steam chests of simple or compound engines. The steam pressure on it can be equalized and oil prevented from syphoning by connecting a 1/8-inch pipe from boiler side of throttle valve and attaching it to the small union E at top of discharge shank of sight-feed. The equalizing pipe should have a valve in it so that the steam may be shut off after the engine throttle is closed.
Should a sight-feed glass become broken, it can easily be replaced without taking off valve D, by simply unscrewing stuffing-boxes AA, and bushing M, when the broken glass can be slipped out and a new one put in place.
These devices are heavy and substantial in construction, and have unions for both oil pipe and engine connections. The shanks are threaded for inch pipe and oil connections for 1/4-inch pipe. Estimates and general information regarding oiling systems furnished on request. In writing, send sketch of engine room showing location cl engines.
The illustration above shows a conventional method of attaching the "Independent" sight-feeds illustrated and listed on page 336. This system of lubrication cornprises a centrally located tank of large size, to hold the cylinder oil, from which can be led off any number of pipes to the engines. We make these tanks in all capacities from five to sixty gallons. See pages 338 and 339.
This system of lubrication is very economical for the reason that no oil is wasted, as is the case in filling a number of small independent lubricators; and, if properly arranged and sufficient hydrostatic pressure is placed on the tank, the oil can be fed with great regularity.
While the illustration shows simply a conventional form of attachment, this systern can be adapted in a number of ways, so that the tank can be located in any part of the engine room most convenient .
When writing, specify size of tank required, number of outlets from same, and also whether the sight-feeds are wanted with or without equalizing attachment.
TANKS FOR PRESSURE OILING SYSTEMS.
A-Tank. B-Oil Gauge. C-Drain Cock. D-Funnel for Filling Tank. E-Delivery Connection, G-Steam Connection.
Where it is desired to supply a series of engines with lubricant from a common source, we are prepared to furnish the tank shown on opposite page. The illustration on page 337 shows a conventional method of its application. A condensing pipe, connected to any convenient source of steam supply, is attached to the connection G to furnish the necessary hydrostatic pressure. The oil outlet pipe is connected to the valve E, from which branches are led off to sight-feeds P (shown in conventional view on page 337) attached to the steam pipes leading to the cylinders.
These tanks are very strong and well made and are guaranteed for working pressures not exceeding 175 pounds per square inch.
We list herewith, tanks having capacities from 5 to 60 gallons, but are prepared to supply larger sizes if desired, and will furnish dimensions and prices upon application.
Connect valve G to any convenient source of steam supply. The pipe directly attached to valve should be at least twenty feet high, to give the necessary hydrostatic pressure. The perfect operation of the device will not be guaranteed unless this detail is observed.
Attach pipe leading to sight-feeds to the outlet valve. When in use, keep this valve wide open and regulate the supply by the valves on the sight-feeds. Close this valve when the engines are not running.
The large funnel D is provided for filling the tank. Use clean oil, as foreign matter is apt to cause considerable annoyance. It is advisable to carefully strain the oil before filling tank. The cock C is provided to drain the tank.
AUTOMATIC SIGHT-FEED "GRAPHITE" LUBRICATOR.
For Cylinders of Steam Engines and Pumps.
The tendency of the present period among steam users generally, is toward higher pressures and often superheated steam, and the use of oil as a lubricant is not entirely satisfactory in all cases.
Flaked graphite has long been known as a superior lubricant, having the peculiar quality of being adapted to be forced into the superficies of the cylinders and valves of steam pumps and engines, due to the motion of the moving parts, giving them a highly finished surface, thus reducing the friction and requiring very little oil. While graphite possesses high lubricating qualities, it is not advisable to use it alone, and we therefore deem it a good practice to use in connection with the "Graphite" Lubricator either an oil pump or sight-feed lubricator. When this combination is effected, it is only necessary to feed about one-third as much oil as when no graphite is used.
The Lunkenheimer Patented Sight-feed "Graphite" Lubricator should always be placed on the steam chest. On slide valve engines it is only necessary to use one cup, placing it in about the middle of the steam chest, but on Corliss engines it is best to use two, placing one over each valve.
DIRECTIONS FOR OPERATING.
Close steam valve and open drain plug to allow steam to escape from cup; then close regulating valve, remove filling plug and fill cup with graphite. After replacing filling plug, close drain plug, open steam valve (wide) and regulate the feed of graphite by regulating valve. The sight-feed glass can be easily cleaned by opening drain plug. If necessary to replace the sightfeed glass, take cup apart by means of lock-nut, and slide the new glass down through the opening.
As graphite is a very superior lubricant, and a small quantity will last quite a while, a continuous feeding of same is not necessary, and the feed may occasionally be shut off. To insure best results, we would recommend the use of our superior Graphite, which is put up in five-pound packages and is reasonable in price.
PLAIN ENGINE LUBRICATOR.
Although a plain lubricator, as its name implies, there is, nevertheless, quite a demand for this design. There are quite a number of different makes of this style of lubricator on the market. but none of them possess the strength or durability of the Lunkenheimer. It is very heavy and is made in two parts, the shank being screwed into the cup, which is very desirable when subjected to rough usage, for should either the shank or cup become damaged, only that part need be replaced, thereby saving the expense of an entire new cup.
The valve in the shank makes it possible to fill the cup while the engine is running. by simply closing same, and it also acts as a feed regulator.
Unless otherwise specified, the filling plug at the top is provided with a wood wheel, but it can be had with an iron wheel if desired without extra charge.
AUTOMATIC NEEDLE VALVE OIL FEEDER.
Lunkenheimer Automatic Needle Valve Oil Feeder is intended for slide valve engines only, works automatically by pulsation, and must be placed on the steam chest. The stop valve must always be left open, except when filling cup with oil. Do not drain off the water until ready to refill the cup. The Lubricator stops feeding when the engine stops, and is about properly adjusted as shipped. To regulate the feed, screw yoke up or down, thereby increasing or decreasing the lift of needle. The greater the lift of the needle, the more oil is fed; the needle works up and down like a check valve while the engine is in motion.
A card with full directions for using Oil Feeder is attached to every cup.
OIL FEEDER WITH COCK AND TUBE.
This Plain Oil Feeder with Cock and Tube is constructed on the same general prin ciples as the old style, but will be found superior in design and efficiency. The cup is heavier, stronger and better proportioned, and instead of an ordinary air cock screwed into the side of the oil chamber, it has a well-made drain valve with drip nozzle, which is not liable to leak; it is located opposite the steam valve instead of on the oil chamber.
As is well known, cups of this character work automatically by condensation, and although the flow of oil from the cup cannot be accurately regulated, still the feed is continuous and the cup requires refilling but once per day. Where a strong and simple automatic lubricator, without sight-feed, is wanted, we recommend this cup. It will be found very convenient for small engines and steam pumps and should be placed on the steam chest.
"MONARCH"- STEAM CYLINDER LUBRICATOR.
A-Reservoir. B-Filling Plug. C-Regulating Valve. D-Drain Valve.
This lubricator was designed particularly for steam drills, but is also applicable for the lubrication of steam pumps and small engines. It is an inexpensive device, but very strong and will readily withstand the rough usage to which steam drill lubricators are usually subjected. A very desirable feature is the large filling hole. The construction comprises but few parts, and there is but little possibility of the "Monarch" getting out of order.
After cup is attached, close valves C and D and fill with oil. Then open regulating valve C slowly, until the proper feed is obtained. When cup requires refilling, close valve C, drain the cup with valve D and fill with oil, then proceed as before.
GAS ENGINE TYPE MULTIPLE OILERS.
For Gas, Gasoline or Coil Engine Cylinder and Bearing Lubrication.
Illustrated above are two forms of Lunkenheimer Gas Engine Type Multiple Oilers, designed for the lubrication of cylinders and bearings of vapor engines. The only difference between these two devices is that Figure 130 has all the snap levers at the top (which control the oil feed) connected by means of a rod, permitting of the closing and opening of all the valves at the same time. If desired, any one or a number of the sight-feed valves can be closed (in the construction shown in Figure 130) by simply screwing down the regulating cap beneath the snap lever, so that the lever will not bear on same when in a vertical position.
All of the sight-feeds are fitted with check ball, baffle cap and equalizing tube, and they can therefore be connected either for cylinder or bearing lubrication. With these improved patented features, and by providing a large and free passage through the outlet connections, the drops are perfectly formed, drop freely and steadily, and the sight-feed valves never fill up, thus insuring a constant, even flow of oil to the cylinders and bearings. The sight-feed glasses are very strong and heavy, and seldom, if ever, have to be renewed. The reservoirs are provided with extra large filling holes and heavy glass ends.
These oiling devices are extensively used on Marine Gas Engines, and can be furnished with any number of sight-feeds or any capacity of reservoir. When ordering, always give the capacity of the reservoir, and the number of sight-feeds; also state whether wanted with independent or connected levers.
The sight-feed unions can be tapped for 1/8, 1/4 or %-inch female pipe, or can be had for -,5, or 3/8-inch outside diameter brass tubing for brazing. Unless otherwise specified, however, the oilers will be furnished with 1/8-inch female pipe threaded unions.
"PREMIER 11 BRASS BODY SIGHT-FEED LUBRICATOR. For Gas, Gasoline or Oil Engines.
This cup is made of the highest grade of bronze composition, the construction is very compact, and the general design will undoubtedly appeal to users of this class of goods. The cup was designed not only with a view to positive and proper lubrication, but also to readily withstand severe service, the body being made entirely of brass. It is particularly adapted for motor boat gasoline engines, and a large number are in use and giving perfect satisfaction.
The "Premier" has a large filling hole, a feature which will be appreciated by users. especially when the cups are applied to motor boat engines, where it is difficult to refill cups without wasting the oil.
Like the "Paragon" lubricator, described on pages 348 and 349, the above is provided with the improved devices for preventing the back pressure from interfering with the proper formation of the drops in the sight-feed. These consist of the large ball check D and baffle cap E.
The large "Bull's Eye" sight-feed P is also an important feature, inasmuch as the oil drops can be plainly seen.
TO REFILL THE CUP WITH OIL, close valves C and X and remove filling plug H. After having filled the cup, be sure to screw down the filling plug tightly. and open valve C to its greatest extent.
TO REGULATE THE QUANTITY OF OIL, adjust valve K.
IMPROVED "PARAGON" GLASS BODY SIGHT FEED LUBRICATOR.
For Gas, Gasoline or Oil Engines.
The improved form of Gas Engine Lubricator shown herewith, which we have designated by the trade name "Paragon", will be found to adequately fulfill the requirements of the service for which it has been designed. Its construction has been improved over the other forms heretofore on the market, and all objectionable features have been eliminated. The construction is very compact, and the general design will, we believe, appeal to users of this class of goods.
The filling arrangement consists of a sliding lid. Referring to the sectional illustration, it will be seen that the slide A screws down on and around the lid of cup, and has a loose plug which covers the filling hole when the slide is swung over to a closed position. This loose plug is so arranged that the wear on same can be taken up by turning down screw B. The whole construction is very heavy, and the slide can be depended upon to seat perfectly and remain tight for an almost indefinite period. On account of this construction, it is possible to secure a large filling hole, which, as users know, is a desirable feature.
The feed-regulating mechanism is the same as our "Sentinel" Pattern oil cup, and the feed can be put on or off by raising or lowering the snap lever C. The rate of feed can be adjusted by turning nut D, which is prevented from loosening by spring E.
By this arrangement, the feed can be set and turned on or off without disturbing the rate of flow. The cup is thoroughly packed around the stem and at the top and bettom of body, and sight-feed glasses, and cannot become leaky.
The whole cup is secured together by our patented locknut construction (not found in other kinds), which makes it impossible for the cup to jar apart, due to the shaking of the engine, and also dispenses with the annoyance of oil leaks. The sight-feed glass is large, and can be readily cleaned by unscrewing the upper part of the cup from the base piece.
The shank is fitted with a large ball cheek valve to prevent back pressure from blowing into the sight-feed chamber and interfering with the proper formation of the drops, which would otherwise be spattered around the glass. In extreme cases, where the back pressure is unusually great, as on old engines with worn piston rings, the check valve does not entirely remedy the trouble. To meet this condition, the sight-feeds are fitted with a "baffle cap" R, placed within the sight-feed glass just above the cheek valve, which effectually muffles and diffuses the gases that escape past the ball. With these improved, patented features, and by providing a large, free passage through the shank, with ample clearance around the check, the drops form perfectly, drop freely and steadily, and the sight-feed glasses never fill up, thus insuring a constant, even flow of oil to the cylinders.
Where a heavier cup is required, we recommend the use of our "Mars" Pattern, which, although not any more efficient in operation, is somewhat heavier in construction.
In ordering extra glasses and cork washers, always specify name and size number of cup, as stamped on same.
IMPROVED "MARS" GAS ENGINE LUBRICATOR.
For Gas, Gasoline or Oil Engines.
This cup is intended to supply the demand for a heavy, substantial and durable glass body lubricator for vapor engines. The glass body enables the operator to readily ascertain the amount of oil in the reservoir. The sight-feed is large and can be easily cleaned when dirty. The "Mars" is provided with a check and baffle cap in the shank, the same as the "Paragon," described on pages 348 and 349. The feed-regulating device is so arranged that when once set, it Deed never be changed when refilling. This cup will feed heavy oils regularly, and having a large opening at the top, is easy to fill.
To fill, turn stop cock B up in a horizontal position, remove filling plug E and fill with oil; replace filling plug, open stop cock B wide by turning the lever down, and regulate oil drops with regulating valve C. Never change regulation of valve C unless necessary to feed more oil, as the cup can be refilled without interfering with same.
When ordering extra glasses and cork washers, give number of cup as stamped on same.
"BANNER" SIGHT-FEED LUBRICATOR.
For Air Compressors, Blowers, Etc.
This Sight-feed Lubricator is designed for use on air compressors and blowers. and will also be found suitable for various other purposes, especially on account of its simplicity and compactness. It is provided with our improved "Sight-feed," which is easily replaced when broken, although, owing to the extra thick glasses, it is seldom,. if ever, that they have to be replaced.
To fill and operate: Close valves B and C and fill with oil. Then open valve B. wide and regulate flow of oil at C.
EXTRA HEAVY "HERCULES" SIGHT-FEED AIR COMPRESSOR LUBRICATOR.
For Working Pressures up to 800 Pounds.
Lunkenheimer "Hercules" Sight-feed Lubricator is intended for the lubrication of air compressor cylinders where the pressure carried is very high. It will safely stand a working pressure of 800 pounds per square inch. The construction is simple, compact and very durable. The improved "Bull's Eye" sight-feed glasses are very strong, thick and are of superior grade, and it is seldom, if ever, that they have to be renewed. Should they break, however, the glass holder can easily be removed with a wrench, and a new glass inserted. For price list of extra "Bull's Eye" glasses, see list below.
To fill the lubricator, close valve K and unscrew cap D, raising it up on the stem B until the stuffing-box strikes the knurled button at the top. The filling hole being very
large, permits of quickly and easily refilling the cup. The regulation is accomplished by means of the stem B, which is operated by the knurled button at the top. A spring F is provided to prevent the regulation from unsetting.
"CUPID" SIGHT-FEED LUBRICATOR.
For Small Blowers.
The demand for a lubricator suitable for the bearings of small blowers has induced us to place on the market the device illustrated above. Of practical and simple construction, this lubricator fulfills all the requirements of the service for which it has been designed, and the large number now in use are giving perfect satisfaction.
The cup is provided with a large filling hole, and the valve E enables regulation of the feed. The oil can clearly be seen feeding, owing to the large Eight-feed glasses. .
To fill the cup, close valve Ewa remove cap B and fill. Replace the plug and regulate the feed with valve E.
ALL-IRON "ARCTIC" SIGHT-FEED LUBRICATOR.
For Ammonia Compressors.
D-Oil Chamber. E-Filling Plug. H-Regulating Valve. J---Stop Valve.
This lubricator was designed particularly for use on ammonia compressors in refrigerating plants. It is made entirely of iron, and is by far better adapted for this service than brass lubricators, inasmuch as brass will not stand the corroding action of ammonia.
In construction the above is similar to the brass "Banner" Sight-feed Lubricator, described on page 391. It is very simple and compact in design, and is provided with our improved "Sight-feed," which is easily replaced when broken. The glasses, however, are very thick, and it is seldom, if ever, that they have to be replaced.
To fill, close valves H and J. To operate, open valve J wide and regulate flow of oil by valve H.
"VULCAN" FORCE-FEED SIGHT-FEED LUBRICATOR. For Gas Engines, Air Compressors, Etc.
A-Oil Reservoir. C-Oil Regulating Valve. D-Piston. E-Thumbnut for raising and regulating piston.
This Cup will be found an excellent lubricator for feeding heavy oils, when cold, to gas engine and air compressor cylinders, as the spring-actuated piston causes a "force-feed." Tests have proven its efficiency for the purpose intended and it is also recommended for use on bearings requiring heavy oil. Do not feed grease in this cup. DIRECTIONS.
Turn thumbnut E to the right until the plunger is drawn to top of cup, then unsere cover and fill the cup with oil. Replace cover and adjust pressure on oil by screwing up thumbnut E to the top of piston stem. Regulate the drops by turning valve C.
This cup is provided with our improved sight-feed, which dispenses with the necessity of packing glass tubes. Broken glasses can be easily replaced at slight expense, but as these glasses are extra heavy, it is seldom, if ever, that they have to be replaced.
PLAIN LUBRICATOR WITH COCK.
To supply the demand for a plain, inexpensive Oil Cup for the lubrication of small steam cylinders, pumps, air compressors, etc., we have designed the above, which is guaranteed to give perfect satisfaction.
It is very strong, is nicely finished, and is provided with either tee or lever handle, by means of which the cup can be easily filled while the engine is running.