Specifications

79
Install the cylinder head using a new head
gasket. On OHV 11-13 models, place the
push rods in the block before installing the
head and head gasket. Tighten the head bolts
in the numbered sequence using 60 inch
pound (6.8 Nm) increments to the specified
torque.
NOTE: Tecumseh strongly recommends you
order a complete seal kit. Replace all "O" ring
and gaskets in kit.
12. STEPS 12A -12G APPLY ONLY TO ENGINE
MODELS OHM, OHSK80-130, OVM AND
OVXL. CONTINUE WITH STEP 12 FOR
ENGINE MODELS OHH, OVRM AND OHV.
a. Install the push rods with the cupped ends
of the rods placed on top of the lifters.
Visually check correct placement through
the valve box opening. Use lubricated new
"O" ring seals for both ends of the push
rod tubes and install the push rod tubes in
the crankcase.
b. Install the valves into the head, and using
a new head gasket, place the head on the
cylinder block. Tighten the head bolts in the
numbered sequence using 60 inch pound
(6.8 Nm) increments to the specified torque.
c. Install the rocker arm housing, push rod
guide plate with the legs facing up, new
rocker arm studs with "O" rings under the
guide plate. Install the valve box to head
retaining screw using a flat washer and a
new "O" ring. Tighten the screw and the
studs to the specified torque.
d. Lift each valve up until it contacts the seat
and hold the valve in this position. Use a
12 inch (30.5 cm) piece of fuel line and
wedge one end on each side of the valve
stem through the port opening to hold the
valve.
e. Bolt the valve spring compressor tool part
# 670315A on a rocker arm stud using the
rocker arm bearing and locking nut.
f. Install the new o-rings (white o-ring on the
exhaust guide) followed by valve spring
caps, valve springs with the closer together
coils toward the head, and valve spring
retainers with the larger opening away from
the engine.
DAMPENING COILS
LOCATED CLOSER
TOGETHER
THIS END MUST
FACE TOWARD THE
STATIONARY PART
OF THE ENGINE
(CYLINDER HEAD)
"O" RINGS
TEFLON EXHAUST
(WHITE)
(BLACK)
RETAINERS HELD BY SPRING
TENSION AGAINST THE CAP
VALVE SPRING
COMPRESSOR TOOL
PART NO. 670315
CAP
RETAINER
OVM / OHM STYLE
64
66
OVRM/OHH 1.105 (28.067 mm)
FREE LENGTH
1.980" (50.292 mm)
ALL OTHERS
65
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