80
14. Remove the internal components. Align the timing
marks on all engines except VM70, 80, 100, HHM80,
HM70, 80, 100, TVM170, 195, 220 to relieve valve lifter
pressure. On these engines it is necessary to rotate
the camshaft clockwise three (3) teeth past the aligned
position to allow the compression release mechanism
to clear the exhaust valve lifter and to allow the
camshaft to be removed (diag. 19 & 20).
TIMING MARK
19
20
OIL SLEEVE TOOL
MOUNTING FLANGE
OIL SEAL
SNAP RING
OIL SEAL REMOVED
13. Remove the cylinder cover or mounting flange using a seal protector positioned in the seal to prevent seal damage.
The crankshaft must be free of rust or scale to slide the cover off the crankshaft. H30-HS50 horizontal crankshaft
engines with ball bearings on the crankshaft require the oil seal and the snap ring to be removed prior to the cylinder
cover removal. On engines equipped with 8 1/2:1 gear reduction, turn the crankshaft to roll the reduction shaft gear off
the crankshaft worm gear when removing the cylinder cover (diag. 15, 16, 17, 18).
WORM GEAR
15
17
16
18
BEVELED TOOTH
CAMSHAFT GEAR
CRANKSHAFT
GEAR
15. Remove the lifters, rod cap, and balance shaft or gears
if applicable.
16. Before removing the piston, remove any carbon from
the top of the cylinder bore to prevent ring breakage.
Push the piston out the top of the cylinder bore.
17. Remove the valves by using a valve spring compressor
to compress the valve spring and rotate the valve spring
retainer to allow the valve stem to pass through. Lift
the valves out of the cylinder block. Remove the spring
assemblies being careful to note the differences, the
original placement of the springs and the presence of
seals. Reinstall the spring assemblies on the same
valve in the reverse order as they are removed.
EXHAUST CAM
ROLL PIN
CAM GEAR
SPRING
INTAKE CAM
PLUNGER (COMPRESSION RELIEF PIN)
1. PTO
Shaft
2. Thin
Washer
3. Gear
4. Tang
Washer
5. Thick
Washer
6. Retainer
To Next Page
Loading...
