Oil System - GMC 1976 ZEO 6083 Maintenance Manual

CAUTION: Do not remove heads when they
are hot . Warpage may occur.
2. After removing heads, clean out all carbon
deposits . Be careful not to damage the outer sealing
edges where gaskets fit. The heads are made of
aluminum and can be damaged by careless handling .
3. Use new head gaskets and clean both the heads
and the cylinder block thoroughly where the head
gaskets rest .
4. Place heads in position and follow head torque
tightening sequence shown in Figure 29 . Start out
tightening all Nuts to 5 ft-lb, then 10 ft .-lb, etc., until
all Nuts are torqued 14-16 ft - lb . (17-19 ft .-lb . on
6KW) .
5. Recheck torque before engine has run a total
of 50 hours.
CRANKCASE OIL
Change crankcase oil every 100 operating hours
and only when engine is warm .
(EXCEPTION : Drain initial oil fill at 25 operat-
ing hours.)
To drain, remove the 1/2 inch cap screw (requir-
ing 3/4" socket) on oil pan. After oil drains, replace
the cap screw and refill crankcase with a good qual
ity detergent oil. Refer to Section 24A for specific
details on oil for the Onan Motor Generator.
OIL FILTER
Change the crankcase oil filter every 200 hours.
Filter is located above starter on right side of engine .
Remove by turning filter counterclockwise with a
filter wrench . Before installing new filter, coat gasket
on base of filter with a light film of oil . Install by
OIL SYSTEM
ONAN MOTOR GENERATOR
24C- 2 1
Figure 29-Cylinder Head Tightening Sequence
turning clockwise until friction is noted, then turn an
additional 1/4 to 1/2 turn . See Figure 30 .
Figure 30-Onan Motor Generator (Right Side View)