Inspection And Service; Valve Details; Exhaust Valve - Kohler Command Pro ECV850 Service Manual

Disassembly/Inspection and Service
3. Once valve spring is compressed, remove following items:
● Valve spring keepers.
● Valve springs.
● Valve spring caps.
● Intake and exhaust valves (mark position).
● Valve stem seals.
4. Repeat above procedure for other cylinder head. Do not interchange parts from one cylinder head to another.

Inspection and Service

Valve Details

EXHAUST VALVE

E
G
H
Dimension
A Seat Angle
B Seat Taper
C Guide Depth
D Guide I.D.
E Valve Head Diameter
F Valve Face Angle
G Valve Margin (Min.)
H Valve Stem Diameter
After cleaning, check fl atness of cylinder head and corresponding top surface of crankcase using a surface plate or
piece of glass and feeler gauge. Maximum allowable out of fl atness is 0.08 mm (0.0031 in.).
Carefully inspect valve mechanism parts. Inspect valve springs and related hardware for excessive wear or distortion.
Check valves and valve seat area or inserts for evidence of deep pitting, cracks, or distortion. Check clearance of
valve stems in guides.
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 valves fi rst. After removal, clean valve
heads, faces, and stems with a power wire brush.
Then, carefully inspect each valve for defects such as a warped head, excessive corrosion, or a worn stem end.
Replace valves found to be in bad condition.
78
F
D
D
Intake
89°
30°
7.65/8.05 mm (0.3012/0.3169 in.)
7.038/7.058 mm (0.2771/0.2779 in.)
38.600/38.805 mm (1.5197/1.5295 in.)
45°
1.0 mm (0.0393 in.)
6.982/7.000 mm (0.2749/0.2756 in.)
KohlerEngines.com
C
A
EXH
B
INT
7.65/8.05 mm (0.3012/0.3169 in.)
7.038/7.058 mm (0.2771/0.2779 in.)
29.375/29.625 mm (1.1565/1.1663 in.)
6.970/6.988 mm (0.2744/0.2751 in.)
INTAKE VALVE
F
E
G
H
Exhaust
89°
30°
45°
1.0 mm (0.0393 in.)
19 690 01 Rev. --