Kohler LH630-775 Service Manual page 154

Section 11
Reassembly
3
2
#1 Cylinder Head
1
4
#2 Cylinder Head
Figure 11-36. Cylinder Head Torque Sequence.
7. Repeat the installation procedure for the #2 side
cylinder head.
Install Push Rods and Rocker Arms
1. Note the mark or tag identifying the push rod as
either intake or exhaust for cylinder #1. Lightly
apply engine oil or grease to the ends of push
rods and install. Make sure that each push rod
ball seats in its respective hydraulic lifter socket.
See Figure 11-37.
NOTE: Push rods must always be installed in
the same position as before disassembly.
Figure 11-37. Installing Push Rods.
11.12
1
4
3
2
Figure 11-38. Installing and Torquing Rocker Arm
Mounting Screws.
Install Valve Covers
2. Apply grease to the contacting surfaces of the
rocker arms and rocker arm pivots. Install the
rocker arms and rocker arm pivots on the
cylinder head.
3. Install two new hex flange rocker arm screws
with Dri-Loc ® thread locking compound on the
threads. Torque the screws to 11.3 N·m
(100 in. lb.). When tightening, use a steady
motion, without interruption, until the proper
torque is achieved. The frictional heat from the
engaging threads may otherwise cause the
locking compound to set prematurely. If new
screws are not available, apply Loctite
to the bottom four or five threads. Then install
and torque the screws to 11.3 N·m (100 in. lb.).
See Figure 11-38.
4. Use a spanner wrench or rocker arm lifting tool
(see Section 2) to lift the rocker arms and position
the push rods underneath.
5. Rotate the crankshaft so the piston in cylinder #2
is at top dead center on the compression stroke,
and repeat the steps for the remaining cylinder.
Do not interchange parts from one cylinder head
with parts from the other cylinder head.
6. Rotate the crankshaft to check for free operation
of the valve train. Check the clearance between
valve spring coils at full lift. The minimum
allowable clearance is 0.25 mm (0.010 in).
1. Make sure the sealing surfaces of cylinder heads
and valve covers are clean and free of all old
gasket material.
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