Kohler COMMAND CV17-745 Service Manual page 189

Kohler Engine Parts Call K&T 606-678-9623 or 606-561-4983
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sealant – using outdated sealant could result in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 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 each
cover. Do not use gaskets or RTV sealant.
4. Position the covers on the cylinder heads. Locate
the cover with the oil separator hole on the #1
cylinder. If loose spacers were used, insert a
spacer in each of the screw holes. 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
11-66.
Gasket/RTV style cover .................. 3.4 N·m (30 in. lb.)
Black O-Ring style cover
w/shoulder screws ...................... 5.6 N·m (50 in. lb.)
w/screws and spacers ................. 9.9 N·m (88 in. lb.)
Brown O-Ring style cover
w/integral spacers ....................... 9.9 N·m (88 in. lb.)
Figure 11-66. Valve Cover Fastener Torque
Sequence.
Install Carburetor
Gasoline may be present in the carburetor and fuel
system. Gasoline is extremely flammable and its
vapors can explode if ignited. Keep sparks and other
sources of ignition away from the engine.
1. Install a new carburetor gasket. Make sure all
2. Install the carburetor, throttle linkage and governor
Figure 11-67. Installing Carburetor, Throttle
Linkage, and Governor Lever.
www.mymowerparts.com
1
4
WARNING: Explosive Fuel!
holes align and are open.
lever as an assembly. See Figure 11-67. If a plastic
intake manifold is used and the carburetor is
equipped with a fuel solenoid, attach the ground
lead. See Figure 11-67.
Section 11
Reassembly
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2
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