4-CYCLE OVERHEAD VALVE ENGINES - Small Engine Discount

15. Remove the cylinder cover or mounting flange
using a seal protector positioned on the seal to
prevent seal damage. The crankshaft must be
free of rust or scale to slide the cover or flange
off the crankshaft. OHH engines with a ball
bearing on the P.T.O. end of the crankshaft
require the oil seal and the snap ring to be
removed prior to the cylinder cover removal. For
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 flange (diag. 16, 17, 18, 19).
16. On engines equipped with 8-1/2 :1 gear
reduction, remove the auxiliary shaft from the
cover by removing the retaining ring and sliding
the shaft out of the washers and drive gear.
17. Align the timing marks on the camshaft and
crankshaft gears and remove the internal
components (diag. 20).
18. Remove the lifters, rod cap, and counterbalance
shaft or gears if applicable.
19. 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.
20. Remove the valves from the head on models
OHH and OVRM by supporting the valves with
fingers while compressing the valve springs, one
at a time, with thumbs. Slide the large opening
in the retainer toward the valve stem to remove
(diag. 21). On all other overhead valve engine
models, place a 3/4" (19.05 mm) deep socket
over the valve cap and strike the top with a steel
hammer. This action loosens the cap. Remove
the cap, retainers, and valve springs. The valve
springs must be assembled on the same valve
they are removed from (diag. 15).
WORM GEAR
SNAP RING
BEVELED TOOTH
OIL SLEEVE TOOL
MOUNTING FLANGE
OIL SEAL
16
GEAR 17
OIL SEAL REMOVED
18
19
TIMING MARK
CRANKSHAFT CAMSHAFT
GEAR GEAR
20
Not For Resale
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