70
Reassembly
KohlerEngines.com
32 690 01 Rev. D
Adjust Valve Clearance
Adjusters Retaining Push Rods
A
D
C
E
B
A
Adjustment Screw
B
End Adjustment Style
C
Adjuster
D
Center Pivot
Adjustment Style
E
Nut
1. Turn adjusters in rocker arms or pivots down
(clockwise) only enough to capture push rods in
recesses.
2. Rotate crankshaft to establish TDC on compression
stroke for cylinder 1.
Check for:
a. Compression will be felt through spark plug hole.
b. Keyway of crankshaft will be aligned with cylinder
1.
c. No rocker arm/push rod movement if crankshaft
is rotated slightly back and forth. If they are
moving, rotate crankshaft 1 full revolution.
3. Insert a 0.127 mm (0.005 in.) feeler gauge between
end of 1 valve and rocker arm. Turn adjuster or
adjustment nut (based on design), until a slight drag
is felt. Hold in this position and tighten locking nut or
setscrew securely. Torque setscrew to 7.9 N·m
(70 in. lb.). After tightening recheck adjustment.
Proper valve clearance is 0.101/0.152 mm
(0.004/0.006 in.).
4. Repeat procedure for other valve on side 1.
5. Viewed from PTO end, rotate crankshaft 270° (3/4
turn) counterclockwise and align crankshaft keyway
with cylinder 2, which now puts cylinder at TDC on
compression stroke.
6. Repeat steps 3-4 for setting valve clearance on side
2.
7. Rotate crankshaft to check for free operation of
valve train. Check for clearance between valve
spring coils at full lift, or bending of push rod(s) can
occur. Minimum allowable clearance is 0.25 mm
(0.010 in.).
Assemble and Install Cylinder Heads
Valve Stem Seals
Some engines use a valve stem seal on intake valves.
If engine being serviced used a valve stem seal, use
a new seal whenever valve is removed, or if seal is
deteriorated or damaged. Never reuse an old seal.
Assemble Cylinder Heads
Prior to installation, lubricate all components with engine
oil, paying particular attention to lip of valve stem seal,
valve stems, and valve guides. Install following items in
order listed below using a valve spring compressor.
● Intake and exhaust valves.
● Valve spring caps.
● Valve springs.
● Valve spring retainers.
● Valve spring keepers.
Install Cylinder Heads
NOTE: Match numbers embossed on cylinder heads
and crankcase.
NOTE: When installing cylinder heads, new screws
should always be used. New screws are
supplied in gasket sets.
NOTE: Push rods should always be installed in same
position as before disassembly.
1. Check to make sure there are no nicks or burrs on
sealing surfaces of cylinder head or crankcase.
Make sure dowel locating pins are in lower 2 cylinder
bolt holes on each side.
2. Install a new cylinder head gasket (with printing up)
on each side.
3. Install each cylinder head and start 4 new screws.
4. Torque screws in 2 stages; first to 22.6 N·m
(200 in. lb.), then finally to 41.8 N·m (370 in. lb.),
following sequence.
Install Rocker Arms
1. Loosen locking nut and back off adjusters for rocker
arms. If adjusters for rocker arms were removed,
reinstall them into threaded end of arm
approximately 3 threads and thread locking nut onto
adjuster from underside. Screw adjuster flush with
bottom of nut as an initial setting. Do not tighten
locking nut at this time, final adjustment will be made
later.
2. Apply grease to contact surfaces of adjusters, rocker
arms and rocker arm pivots. Install rocker arms and
rocker arm pivots onto appropriate cylinder head,
and start screws.
3. Hold rocker arms in aligned position and torque
screws to 11.3 N·m (100 in. lb.).
4. Note mark or tag identifying push rod as either
intake or exhaust and cylinder 1 or 2. Check each
push rod is straight and not bent. Dip ends of push
rods in engine oil and install in their original
positions, making sure each push rod ball seats in its
tappet socket.
