Section 2.4

CRANKSHAFT AND CAMSHAFT

Figure 6. Bearing Bore in Crankcase Cover

COMPRESSION RELEASE MECHANISM

A mechanical compression release is provided on the camshaft. See Figure 7. A PIN extends over the cam lobe. This PIN pushes on the tappet, to lift the valve and relieve compression for easier cranking. When the engine starts, centrifugal force moves the FLY- WEIGHT outward against SPRING force. The PIN will then drop back and allow the engine to run at full compression.

Measure the amount of compression release lift at the tappet (Figure 8).

COMPRESSION RELEASE LIFT FOR GV-220 ENGINE

(MEASURED AT TAPPET)

DESIGN LIFT: 0.020-0.047 inch (0.50-1.20mm)

WEAR LIMIT: 0.016 inch (0.406mm) Minimum

Figure 7. Compression Release Mechanism on

Camshaft

Figure 8. Measuring Compression Release Lift

INSTALLING THE CRANKSHAFT

Before installing the crankshaft, lubricate all bearing surfaces with engine oil. Use oil seal protectors, to prevent damage to seals during installation. Install the crankshaft as follows:

1.Lubricate all bearing surfaces with engine oil.

2.Install the valve tappets.

3.Support both ends of the crankshaft and carefully install into the crankcase.

4.Rotate the crankshaft until the timing mark (Figure 9) is toward the cam gear side of the crankcase.

INSTALLING THE CAMSHAFT

Apply engine oil to the camshaft main bearing and to bearing bore in crankcase. Carefully install the camshaft into the crankcase camshaft bore.

Hold the tappets out of the way during installation. Align timing mark on camshaft gear with timing mark on crankshaft gear (piston will be at top dead center). See Figure 10.

NOTE: For Installation of the oil pump assembly, oil pickup assembly and crankcase cover, see Part 5 "ENGINE OIL & COOLING SYSTEM".

Page 2.3-7

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Generac Power Systems 941-2, 940-2 Compression Release Mechanism, Installing the Crankshaft, Installing the Camshaft

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