4-CYCLE OVERHEAD VALVE ENGINES - Small Engine Discount

10. Remove the flywheel key and alternator if
equipped, and baffle plate.
11. Remove the muffler.
12. Remove the intake pipe, spacer if equipped, and
the carburetor. Be careful not to bend or damage
the linkage when removing. Mark the hookup
points or diagram the linkage arrangement to
aid in reassembly.
13. Remove the head by first removing the valve
cover. The push rod guide plate must be
removed to access one of the head bolts.
Remove the rocker arms by loosening the two
locking nuts or allen head screws. Use a 3/16"
Allen wrench and a 7/16" wrench on OHH,
OVRM and OHV 11-13 use a 1/2 wrench,
OHV13.5 - 17 use a 3/16" allen and 1/2" wrench.
Remove the rocker arm nuts or rocker arm
bearings followed by the rocker arms, rocker
arm studs, guide plate, and push rods. Remove
the head bolts, head, and head gasket.
NOTE: ON SOME OHV ENGINES THE
EXHAUST PUSH ROD CAN ONLY BE
REMOVED AFTER THE HEAD IS OFF. YOU
MUST HAVE IT BACK IN BEFORE RE-
ASSEMBLY.
On engine models OHM, OHSK120, OVM,
OVXL and OHV, with independent cylinder head
and rocker box, the valve springs, caps,
retainers, and retainer screw must be removed
to allow the rocker box to separate from the
head. Remove the jam nut, adjusting nut, rocker
arm bearings, rocker arms, push rods, guide
plate, and the rocker arm retainer screw.
Next to prevent valve or piston damage turn the
piston down in the cylinder. Then place a 3/4"
(19.05 mm) deep socket over the valve cap and
strike the top with a steel hammer (diag. 15).
This action loosens the cap. Remove the cap,
retainers, and valve springs. Remove the rocker
arm housing, head bolts, head, head gasket and
valves. Notice the "O"rings used to seal the
rocker box , valve stems, and push rod tubes.
14. Remove the crankcase breather if necessary.
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