Kohler Aegis LH630 Service Manual page 63

Install Cylinder Heads
Cylinder Head Torque Sequence
3 1
2 4
#1
NOTE: Match numbers embossed on cylinder heads
and crankcase.
1. Check to make sure there are no nicks or burrs on
sealing surfaces of cylinder head or crankcase.
2. Rotate crankshaft to position piston in cylinder 1 to
top dead center (TDC) on compression stroke.
3. Install a new cylinder head gasket.
4. Install cylinder 1 head onto number 1 side mounting
studs.
5. Install a plain washer onto each stud and secure
with a nut.
6. Torque nuts in two steps, first to 16.9 N·m
(150 in. lb.) and then to 33.9 N·m (300 in. lb.), using
torque sequence shown.
7. Repeat installation procedure for cylinder 2 side
head.
Install Push Rods and Rocker Arms
NOTE: Push rods must always be installed in same
position as before disassembly.
1. Note mark or tag identifying push rod as either
intake or exhaust for cylinder 1. Lightly apply engine
oil or grease to ends of push rods and install. Make
sure that each push rod ball seats in its respective
hydraulic lifter socket.
2. Apply grease to contacting surfaces of rocker arms
and rocker arm pivots. Install rocker arms and rocker
arm pivots on cylinder head.
3. Install new rocker arm screws with Dri-Loc® thread
locking compound on threads. Torque screws to
11.3 N·m (100 in. lb.). When tightening, use a steady
motion, without interruption, until proper torque is
achieved. Frictional heat from engaging threads may
otherwise cause locking compound to set
prematurely. If new screws are not available, apply
Loctite 242 to bottom 4 or 5 threads. Then install
® ®
and torque screws to 11.3 N·m (100 in. lb.).
4. Use a spanner wrench or rocker arm lifting tool to lift
rocker arms and position push rods underneath.
5. Rotate crankshaft so piston in cylinder 2 is at top
dead center on compression stroke, and repeat
steps for remaining cylinder. Do not interchange
parts from one cylinder head with parts from other
cylinder head.
66 690 01 Rev. A
3
1
4 2
#2
KohlerEngines.com
6. Rotate crankshaft to check for free operation of
valve train. Check clearance between valve spring
coils at full lift. Minimum allowable clearance is 0.25
mm (0.010 in).
Install Valve Covers
1. Make sure sealing surfaces of cylinder heads and
valve covers are clean and free of all old gasket
material.
2. Install new valve cover gaskets onto valve covers.
3. Install valve covers with gaskets in their original
locations.
4. Install lower mounting screws in each cover, and
finger tighten only. Upper screws will be installed
later.
Install Water Pump, Drive Belt, and Transfer Tube
Assembly
Water Pump Components
B
C
D
A
O-ring
C Water Pump Belt
E Transfer Tube
Water Pump Torque Sequence
3
1
6
NOTE: A mark or dot of paint applied to top, of pulley,
indicating keyway location, will make installation
easier.
Reassembly
A
E
B
Water Pump
D Camshaft Pulley
5
2
4
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