4-CYCLE OVERHEAD VALVE ENGINES - Small Engine Discount

13. On engine models OHH and OVRM, install
the push rods on the lifters, and rocker arms
and lock nuts on the rocker arm pivot screws.
Fasten the screw to the head with the push
rod guide plate tabs facing up. Turn the screws
in until slight play exists between the valve
stem and rocker arm.
On OHM, OHSK120, OVM, and OVXL
models, install the rocker arms, rocker arm
bearings, and new rocker arm adjusting nuts
on the studs. Tighten the adjusting nut until
slight play exists.
On OHV 11-13, OHSK80-130, OHV110-145
models, install the push rods on the lifters,
place the rocker arms on the rocker arm
screws followed by the locking nut, washer,
and push rod guide plate (with the tabs up).
Turn the screws in until slight play exists
between the valve stem and rocker arm.
On OHV13.5 -17 models, install the guide
plate with the rocker arm studs and torque to
190 in. lbs. (21.5 Nm). Insert the push rods
in the lifter sockets with the longer steel end
toward the rocker arms. Place the rocker arms
onto the studs with the socket end toward the
push rod and thread the rocker arm bearings
on until excessive play is removed.
14. Set the valve lash with the engine cold, the
piston at T.D.C., and both valves closed. Insert
the specified feeler gauge between the rocker
arm and valve stem. Adjust until a slight sliding
drag is felt.
On models OHH and OVRM, lock this position
by holding an 3/16" Allen wrench on the pivot
ball screw while tightening the lock nut to 120
in. lbs. (13.5 Nm) of torque. A 7/16" crowfoot
will be needed to torque the lock nut. Rotate
the crankshaft at least one full turn to check
push rod movement and valve lash (diag. 67).
On models OVM, OHM, OHSK120 and
OVXL, with a 1/2" crowfoot, tighten down the
rocker arm studs to 190 in. lbs. (21.5 Nm).
Adjust the rocker arm hex nut with a 1/2"
wrench to set the correct valve lash and
tighten the locking jam nut to 18 in. lbs. (2
Nm). Rotate the crankshaft at least one full
turn to check push rod movement and valve
lash (diag. 68).
On models OHV 11-13, OHSK80-130,
OHV110-145, hold the rocker arm pivot
bearing using a 7/16" wrench or socket while
using a 1/2" crowfoot to tighten the lock nut
to 120 in. lbs (13.5 Nm) of torque. Rotate the
crankshaft at least one full turn to check push
rod movement and valve lash (diag. 69).
"O" RING OR GASKET
FEELER
GAUGE
VALVE STEM
OHH / OVRM
LOCKING / ADJUSTING NUT
CROWN DOWN
ROCKER ARM
STUD
OVM / OHM / OVXL
3/16"
ALLEN WRENCH
7/16"
CROWFOOT WRENCH
67
PUSH ROD
GUIDE
TABS UP
68
7/16"
SOCKET WRENCH
1/2"
CROWFOOT
WRENCH
OHV 11-13 and OHV 110-135 / OHSK80-130 69
80
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