GMC 1976 ZEO 6083 Maintenance Manual page 687

24C- 1 0
ONAN MOTOR GENERATOR
11 . Remove oil base, oil pump and cylinder
heads.
etc.
12 . Remove valves, springs, rocker arm, lifters,
13 . Remove camshaft and gear assembly .
14 . Remove connecting rods, pistons and bear-
ings .
15 . Remove rear bearing plate.
16 . Remove crankshaft .
17 . Remove front main bearing.
ASSEMBLY
Observe proper clearances throughout the en-
gine . Use a torque wrench to assure proper tightness.
Coat the internal engine parts with SAE 30 oil as
they are assembled . After the internal engine parts
are assembled, the engine should turn over by hand
freely .
1 . Use the proper bearing driver to install front
main bearing after coating it with a light film of oil.
2 .
3 .
4.
5 .
6 .
NOTE :
Keep all parts in their respective orders .
Keep valve assemblies together . Return rod caps
to their respective pistons. Analyze the reasons
for parts failure.
Insert rear main bearing in rear bearing plate.
Install crankshaft and rear bearing plate.
Install connecting rods, pistons and bearings .
Install camshaft and gear .
Install valve assemblies .
etc.
Figure 5-Valve System
7. Install oil pump, oil base and cylinder heads.
8 . Install breaker box .
9. Install fuel pump, oil filter, starter, generator,
carburetor, fuel lines, spark plugs, etc.
10 . Install crank gear, aligning crank gear mark
with camshaft .
11 . Install gear cover and oil seal .
12 . Install flywheel alternator stator .
13 . Install flywheel .
14 . Install all housings, air cleaner, control box,
15 . Reinstall power plant in vehicle, making
proper fuel, battery, electrical and exhaust connec-
tions.
16 . Fill crankcase with oil .
17 . Start engine.
18 . Check oil pressure.
19 . Run engine approximately 15 minutes to
bring up to operating temperature .
20. Check for oil leaks, electrical connections,
fuel lines and exhaust connections .
VALVE SYSTEM (FIGURE 5)
Properly seated valves are essential to good en-
gine performance. The aluminum cylinder heads are
removable for valve servicing. Do not use a pry bar
to loosen the cylinder head; rap sharply on the edge
with a soft faced hammer, taking care not to break
NOTE : USE A STANDARD AUTOMOTIVE-
TYPE WRENCH TO ADJUST THE
TAPPETS .
NOTE : SEE VALVE TAPPET
CLEARANCES IN TEXT .
VALVE RETAINER
_VALVE SPRING
VALVE GUIDE, -
O `
A-1594