Section 5.1

ENGINE OIL SYSTEM

OIL PUMP (CONTINUED)

INSPECTION (CONT'D):

Inspect the outer drive pins on the camshaft. Look for breakage, bending, other damage. These are roll pins which can be removed and replaced.

Figure 3. Oil Pump Check Points

CRANKSHAFT OIL SEALS

An oil seal is provided in the crankcase and in the oil sump, to prevent leakage past the crankshaft jour- nals. See Figure 4.

PRESSURE RELIEF VALVE

DESCRIPTION:

A ball type pressure relief valve is located in a bore of the crankcase. The ball and spring are retained in the crankcase bore by a spring retainer.

The Relief Valve serves to limit oil pressure to a maxi- mum value. The ball will remain against its seat as long as oil pressure in the crankcase ail passage is below approximately 30 psi (29 kg/cm ). Should oil pressure increase above that value, the ball will be forced off its seat to relieve excess pressure into the crankcase.

1. SCREW

2. RETAINER

3. SPRING

4. BALL

4

3

2

1

Figure 5. Oil Pressure Relief Valve

A defective or leaking seal can be replaced. If the crankshaft has been removed from the engine, old seals can be removed by tapping out with a screw- driver or punching them out from inside. Oil seal pullers are available commercially, for seal removal with the crankshaft installed.

Always use a seal protector when installing the crank- shaft into its crankcase bore and when installing the oil sump over the crankshaft.

Figure 4. Crankshaft Oil Seals

INSPECTION:

Remove the 8mm screw that retains the spring RETAINER to the crankcase interior. Remove the RETAINER, SPRING and BALL. Clean all parts in solvent.

Inspect the BALL and RETAINER for damage, exces- sive wear. Replace any damaged or worn compo- nents. Inspect the SPRING and replace if damaged or worn.

Apply a known test load to the SPRING, sufficient to compress the spring to a length of 1.03 inch (26.3mm). The amount of the test load at the stated spring length should be as follows:

FORCE REQUIRED TO COMPRESS

RELIEF VALVE SPRING TO 1.03 INCH (26.3mm)

0.86-0.95 pounds (0.43-0.39 kg)

If the test load at the stated length is not within limits, replace the SPRING.

BREATHER ASSEMBLY

DESCRIPTION:

A crankcase breather is located in the crankcase assembly.

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Generac Power Systems 940-2, 941-2 Crankshaft OIL Seals, Pressure Relief Valve, Breather Assembly, Inspection Contd
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941-2, 940-2 specifications

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