Illus

CRANKCASE BREATHER (SIDE VALVE ENGINE)

7. Oil seal ring spring.

8. Oil seal ring—must bear against centrifuge.

9. Oil centrifuge—separates oil from air by centrifugal force, allowing only air and a slight oil mist to escape through holes in periphery of centrifuge.

10. Outside breather oil trap.

11. Outside breather tube—through which air, after having been separated from oil is exhausted to atmosphere.

Servicing Oil Pump (O.H.V. Engine)

(1941 to 1947 Models)

(To Identify Items. Refer to Illus. 56)

Oil feed pump and scavenger (oil return) pump are gear type pumps incorporated in one pump body. Feed pump incorporates an automatic (centrifugal) by-Dass valve, reducing oil feed supply at low engine speeds and increasing supply at high engine speeds.

Pump is provided with check valve (11) and adjustable pressure regulating valve (16). Maximum pressure is approximately 30 pounds per sq. in.

Thoroughly clean exterior of pump in gasoline or cleaning solvent before disassembling.

With cover (29), governor rotor (28) and cover plate (26) and gasket (27), already removed, scavenger pump gears (wide gears) (22) and (23) are exposed. Scavenger pump gear (23) is keyed on pump drive shaft (8) and idler gear (22) idles on stud in pump body.

Remove lock ring (24) from end of pump drive shaft and slide gears off shaft and stud respectively. Remove scavenger pump gear key (21) from pump drive shaft.

Drive shaft can now be pulled out of pump body. Oil feed pump gears (narrow gears) (5) and (6) are now free for removal, however, gear (6) may come out with drive shaft. Remove drive gear key (7) from drive shaft.

Remove chamber cap screws (9) and (13), adjusting screw (14), springs (10) and (15) and valves (11) and (16).

Remove front chain oiler adjusting screw (17) and adjusting screw washers (18) and (19). If pump is fitted with rear chain oiler, remove adjusting screw and adjusting screw washers.

Clean all parts in gasoline or cleaning solvent and blow out all pump body passages with air.

Using a light, inspect valve seats in pump body for pits and for dirty condition. Note: A small particle of foreign matter lodged on valve seat will prevent valve from seating, thus preventing correct operation of pump. Replace pump body if seats are damaged.

Inspect springs for breakage and rusted condition. Replace if not in good condition. Free length of new pressure regulating (by-pass) valve spring (15) is approximately 1-31/32".

Check valve spring (10) is the same for all pumps but is not interchangeable with any pressure regulating (by-pass) valve spring. It is much lighter (has less tension) than pressure regulating (by-pass) valve spring. Free length of check valve spring is approximately 1-9/32".

Valves (11) and (16) are interchangeable for check valve or pressure regulating (by-pass) valve and are the same for all pumps. Valves may have rings formed by action on valve seats. Valves not perfectly smooth and round should be replaced.

Governor rotor (28) and rotor chamber in pump cover (29) ordinarily show no appreciable wear, and very seldom need replacing.

Make sure that all parts and valve seats and all passages in pump body are thoroughly clean and free from dust, dirt, or grit before assembling. Also make sure valve in governor rotor (28) works freely, as a sticking valve will likely result in over-oiling at lower speeds.

Install check valve (11) and spring (10) and secure with cap screw (9). Install pressure regulating (by pass) valve (16), spring (15), and adjusting screw (14), turning in adjusting screw until end of screw is %" below end of valve chamber. This is normal setting. See "Adjusting Oil Feed Pump." Page 28.

To complete assembling of oil pump reverse procedure followed in disassembling. Note that one of the three gear keys, (7), is smaller than other two-install this key in shaft for oil feed pump gear (6) (narrow gear).

Some pumps may have a thin (.003") spacer behind scavenger pump idler gear (22) and gear will be .497" wide. Other pumps will have no spacer behind scavenger pump idler gear and gear will be .500" wide. A gear .497" wide should be used with spacer but a gear .500" wide must not be used with spacer. To exceed a total of .500" for width of idler gear and thickness of spacer may cause gear to bind tight enough to result in serious damage to pump.

Note: If scavenger idler gear has a groove on one side starting between two gear teeth and extending nearly to stud hole, install it on stud with grooved side against pump body. If scavenger idler gear has a groove across stud hole and in line with gear teeth, install it on stud with groove side outward. Parts order scavenger idler gear has both the grooves just mentioned, one on each side; is .497" wide and can be installed in any OM.V. Model scavenger pump.

If pump is fitted with rear chain oiler, install scavenger pump gear (23) on drive shaft with groove (between two gear teeth) outward.

Lock rings (1) and (24) are often damaged when removing them, therefore, it is advisable to install new ones when reassembling and installing pump. Make sure lock ring is securely engaged and seated in retaining groove.

Servicing Oil Pump (O.H.V. Engine)

(1940 Model)

With few exceptions, information under "Servicing Oil Pump" (O.H.V. Engine)—1941 to 1947 Models, Page 71, applies to 1940 Model oil pump. The exceptions are:

1. Pump does not incorporate governor rotor with automatic (centrifuaal) by-pass valve.

2. Pressure regulating (by-pass) valve spring is not interchangeable with 1941 and later spring. Free length of new pressure regulating (by-pass) valve spring (15) is approximately 1-25/32".

Servicing Oil Feed Pump (Side Valve Engine)

(1941 to 1947 Models)

(To Identify Items. Refer to Illus. 57)

Oil feed pump is of the vane type. Pump incorporates an automatic (centrifugal) by-pass valve, reducing oil feed supply at low engine speeds and increasing supply at high engine speeds. Pump is provided with two check valves (8) and (16) and adjustable pressure regulating valve (4). Maximum pressure is approximately 35 pounds per sq. in.

Thoroughly clean exterior of pump in gasoline or cleaning solvent before disassembling.

When disassembling oil feed pump, note location of all parts for correct reassembly.

Remove rotor (17) with vanes (19) and (20) and spring (18) from pump body (5) holding vanes to prevent expansion of spring and possible loss of parts.

Remove chamber cap screws (1), (6) and (14), adjusting screw (2), springs (3), (7) and (15) and valves

Clean all parts in gasoline or cleaning solvent and blow out all pump body passages with air.

Inspect rotor chamber closely for excessive wear caused by vanes. Pump body with badly worn rotor chamber should be replaced.

Inspect vane spring (18) for breakage and rusted condition. Free length of new spring is approximately 1-5/32". Replace if not in good condition. Vanes will usually be found in good condition, unless excessively worn by dirt taken into engine (rotor chamber would also be worn). Replace worn or damaged vanes.

Using a light, inspect valve seats in pump body for pits and for dirty condition. Note: A small particle of foreign matter lodged on valve seat will prevent valve from seating, thus preventing correct operation of pump. Replace pump body if seats are damaged.

Inspect springs for breakage and rusted condition. Replace if not in good condition. Free length of new pressure regulating (by-pass) valve spring (3) is approximately 2-1/16".

Check valve springs (7) and (15) are the same for all pumps, but are not interchangeable with any pressure regulating (by-pass) valve spring. It is much lighter (has less tension) than pressure regulating (by-pass) valve spring. Free length of new check valve spring is approximately 1-9/32".

Valves (4), (8) and (16) are interchangeable for check valve or pressure regulating (by-pass) valve and are the same for all pumps. Valves may have rings formed by action on valve seats. Valves not perfectly smooth and round should be replaced. Rotor and centrifugal by-pass valve assembly (17), and rotor chamber in pump body, ordinarily show no appreciable wear, and very seldom need replacing.

Make sure that all parts, and valve seats and all passages in pump body are thoroughly clean and free from dust, dirt, or grit before assembling. Also make sure valve in rotor (17) works freely, as a sticking valve will likely result in over-oiling at lower speeds.

Install the two check valves (8) and (16), springs (7) and (15) and secure with chamber cap screws (6) and (14). Install pressure regulating (by-pass) valve (4) and spring (3). Turn down adjusting screw (2) until end of screw is 3/a" below top of pump body. This is normal setting. See "Adjusting Oil Feed Pump," Page 28. Install chamber cap screw (1).

Install spring (18) between rotor vanes (19) and (20) registering spring ends in holes in vanes and install rotor and vane assembly in pump body chamber. Make sure that chamber rotor and vanes are perfectly clean and thoroughly oiled before installation.

Servicing Oil Feed Pump (Side Valve Engine)

(1940 and Earlier Model)

With few exceptions information under "Servicing Oil Feed Pump" (Side Valve Engine), 1941 to 1947 Models, Page 72, applies to 1940 and earlier Model oil feed pump. The exceptions are:

1. 1940 and earlier Model oil feed pump has one check valve instead, of two.

2. Pump rotor (17) does not incorporate an automatic (centrifugal) by-pass valve.

3. Pressure regulating (by-pass) valve adjusting screw setting differs—turn screw (2) down (to right) until it bottoms lightly against ball valve and then turn it out (to left) 9 full turns. This is normal setting. See "Adjusting Oil Feed Pump," Page 28.

4. Pressure regulating (by-pass) valve spring is not interchangeable with 1941 to 1947 spring. Free length of new spring for 1940 and earlier Model pump is approximately l5/s".

Installing Oil Pump (O.H.V. Engine)

(1941 to 1947 Models)

(To Identify Items, Hefer to Illus. 56)

Examine pump gaskets closely. If they are in good condition they can be re-used. If condition is at all questionable, install new "factory-made" gaskets. Never use "home-made" gaskets because these gaskets have holes especially located for oil pas sages and if a hole is left out or put in wrong place, oiling system may be put completely out of commission. With pump assembled (except pump cover, rotor and cover plate) and pump body gasket (4) in position against crankcase, enter pump drive shaft in bushing in crankcase and mount pump on studs.

Install drive gear key (3) in shaft keyway, and install drive shaft gear (2) and lock ring (1). Use new lock ring and make sure it is securely engaged and seated in retaining groove. Insert flat head screw (20) and tighten securely. Note: Before installing drive shaft gear (2), install bearing oil seal ring (33) shown in Illus. 62.

Install cover plate gasket (25), cover plate (26), and cover gasket (27).

Install oil governor rotor (28) in pump cover (29). Start cover on mounting studs, turn pump drive shaft slowly and press lightly against cover until driving tongue on rotor (28) registers in slot in scavenger idler gear.

Install nuts (31) and (32) and lock washers on pump mounting studs, insert hexagon head screw (33) with washer and tighten nuts securely. Note that extension nut (32) is placed on left center stud.

Turn pump drive shaft and note whether or not it turns freely. If there is considerable bind, check pump to determine cause.

Installing Oil Pump (O.H.V. Engine)

(1940 Model)

(To Identify Items. Refer to Illus. 56)

With the exception of installing governor rotor (28), cover plate (26), screws (20) and (33), information under "Installing Oil Pump (O.H.V. Engine)" 1941 to 1947 Models, applies to 1940 Model oil pump.

Memorando

DIY Battery Repair

DIY Battery Repair

You can now recondition your old batteries at home and bring them back to 100 percent of their working condition. This guide will enable you to revive All NiCd batteries regardless of brand and battery volt. It will give you the required information on how to re-energize and revive your NiCd batteries through the RVD process, charging method and charging guidelines.

Get My Free Ebook


Post a comment