9-4
ADJUSTING VALVE LASH
Valve lash is adjustable through the maintenance
access opening on gensets with enclosures. Ac-
cess to Cylinder No. 1 requires removal of the air fil-
ter enclosure. See Page 8-1, 8-8 or 8-13, depend-
ing on fuel system.
Note: For accurate adjustments, valve lash
must be adjust when the engine is at room tem-
perature.
Adjust valve lash (Figure 9-2) for all valves to
0.004 inch (0.01 mm). Torque the adjustment lock
nuts to 6.5 lb-ft (8.5 N-m) and recheck lash.
The following procedure is recommended, noting
that the intake valves are the upper ones and the ex-
haust valves the lower ones and that Cylinder No. 1
is to the left (generator side) and Cylinder No. 2 to
the right:
1. Remove the spark plugs so that the engine is
easier to turn over.
2. Use a socket wrench on the generator pulley
nut to turn the engine. Remove the snap-in cov-
er in the access hole in the drip pan. Always
turn clockwise so that the nut does not loosen.
3. Remove the valve covers. Have rags in place
to catch the oil that spills out.
4. Turn the engine until the Cylinder No. 2 intake
valve (top) is at maximum lift. Then adjust Cyl-
inder No. 1 intake valve lash.
5. Turn the engine until the Cylinder No. 2 ex-
haust valve (bottom) is at maximum lift. Then
adjust Cylinder No. 1 exhaust valve lash.
6. Turn the engine until the Cylinder No. 1 intake
valve (top) is at maximum lift. Then adjust Cyl-
inder No. 2 intake valve lash.
7. Turn the engine until the Cylinder No. 1 ex-
haust valve (bottom) is at maximum lift. Then
adjust Cylinder No. 2 exhaust valve lash.
8. Secure the valve covers using new gaskets.
Torque the cover screws to 5.5 lb-ft (8 N-m).
9. Replace the spark plugs and pulley nut cover.
FIGURE 9-2. ADJUSTING VALVE LASH
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