Kohler Courage SV710-740 Service Manual page 110

Section 9
Inspection and Reconditioning
Stamped Steel Valve Cover
Using a brass wire brush and gasket remover or
similar solvent, clean the old RTV from the surface of
the cylinder head and valve cover.
The sealing surface of stamped steel valve covers
must be checked for flatness prior to reinstallation.
Hold the valve cover down firmly against a flat,
level surface or piece of glass, and check around
the entire perimeter that a 0.012 in. (0.30 mm) feeler
gauge cannot be inserted anywhere. See Figure
9-4. If the gauge goes in anywhere, the cover needs
to be replaced. Refer to Section 10 for valve cover
reassembly procedures.
EXHAUST
VALVE
G
H
Dimension
Seat Angle
A
Insert O.D.
B
C Guide Depth
Guide I.D.
D
E
Valve Head Diameter
Valve Face Angle
F
G Valve Margin (Min.)
Valve Stem Diameter
H
Figure 9-5. Valve Details.
Hard starting, or loss of power accompanied by high
fuel consumption may be symptoms of faulty valves.
Although these symptoms could also be attributed to
worn rings, remove and check the valves first. After
removal, clean the valve heads, faces, and stems with
a power wire brush. Then, carefully inspect each valve
9.4
F
C
E
D
D
Intake
89°
36.987/37.013 mm (1.4562/1.4572 in.)
4 mm (0.1575 in.)
7.038/7.058 mm (0.2771/0.2779 in.)
33.37/33.63 mm (1.3138/1.3240 in.)
45°
1.5 mm (0.0591 in.)
6.982/7.000 mm (0.2749/0.2756 in.)
Figure 9-4. Checking with Feeler Gauge.
INTAKE VALVE
F
B A
E
EXHAUST
A
INSERT
INTAKE
INSERT
A
B
89°
32.987/33.013 mm (1.2987/1.2997 in.)
6.5 mm (0.2559 in.)
7.038/7.058 mm (0.2771/0.2779 in.)
29.37/29.63 mm (1.1563/1.1665 in.)
45°
1.5 mm (0.0591 in.)
6.970/6.988 mm (0.2744/0.2751 in.)
for defects such as warped head, excessive corrosion,
or worn stem end. Replace valves found to be in bad
condition. A normal valve and valves in bad condition
are shown in the accompanying illustrations.
G
H
Exhaust