Kohler COMMAND CH18-745 User Manual download pdf (Page 211)

11.26

Section 11

Reassembly

Install Valve Covers

Three valve cover designs have been used. The

earliest type used a gasket and RTV sealant between

the cover and sealing surface of the cylinder head. The

second type had a black O-Ring installed in a groove

on the underside of the cover and may have metal

spacers in the bolt holes. The newest design uses a

brown O-Ring, and the bolt hole spacers are molded in

place. The tightening torque differs between gasket

and O-Ring style covers. Kits are available for

converting to the latest O-Ring type covers.

Differences are pointed out in the following installation

steps.

NOTE: Do not scrape old RTV sealant (if used) off

the sealing surface of the cylinder head as

this could cause damage and result in leaks.

The use of gasket remover solvent (paint

remover) is recommended.

1. If using the gasket or sealant type cover, prepare

the sealing surfaces of the cylinder head and

cover as directed in Service Bulletin 252. Refer to

Section 2, for approved sealants. Always use

fresh sealant – using outdated sealant could

result in leakage. With O-Ring type covers, make

sure the sealing surfaces are clean.

2. Make sure there are no nicks or burrs on the

sealing surfaces.

3. For covers requiring RTV sealant, apply a 1.5 mm

(1/16 in.) bead to the sealing surface of both

cylinder heads, install a new valve cover gasket

on each, then apply a second bead of sealant on

the top surface of the gaskets. For O-Ring type

covers, install a new O-Ring in the groove of the

covers. Do not use gaskets or RTV sealant.

4. Locate the cover with the oil fill neck on the same

side as removed and install the lifting strap in the

original position. With O-Ring type covers,

position the cover on the cylinder head. If loose

spacers were used, insert a spacer in each of the

screw holes. On both types, install the four hex.

flange screws in each cover and finger tighten.

5. Torque the valve cover fasteners to the proper

specification using the sequence shown in Figure

11-85.

Figure 11-86. Tightening Valve Cover Screws.

Install Air Cleaner Assembly

Refer to Section 4 for air cleaner reassembly

procedure.

1. Attach the rubber breather hose to the breather

cover. Connect the fuel inlet line to the carburetor

and secure with a clamp. See Figure 11-87.

Figure 11-85. Valve Cover Fastener Torque

Sequence.

NOTE: Fastener #2 may secure fuel pump bracket

on earlier models.

Gasket/RTV style cover.............3.4 N·m (30 in. lb.)

Black O-Ring style cover

with shoulder screws...........5.6 N·m (50 in. lb.)

with screws and spacers .....9.9 N·m (88 in. lb.)

Brown O-Ring style cover

with integral spacers ...........9.9 N·m (88 in. lb.)

1 2 ... 206 207 208 209 210 211 212 213 214 215 216 217 218

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Kohler COMMAND CH18-745 User Manual Page 211

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