Exhaust Valve - Kohler command cv17 Service Manual

Disassemble Cylinder Heads
NOTE: These engines use valve stem seals on intake valves. Use a new seal whenever valve is removed or if seal is
deteriorated or damaged in any way. Never reuse an old seal.
1. Remove screws, rocker arm pivots and rocker arms from cylinder head.
2. Compress valve springs using a valve spring compressor.
3. Once valve spring is compressed, remove following items.
● Valve spring keepers.
● Valve spring retainers.
● Valve springs.
● Valve spring caps.
● Intake and exhaust valves (mark position).
● Valve stem seal (intake valve only).
4. Repeat above procedure for other cylinder head. Do not interchange parts from 1 cylinder head to other.
Inspection and Service
Valve Details

EXHAUST VALVE

Dimension
A Seat Angle
B Insert O.D.
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 flatness of cylinder head and
corresponding top surface of crankcase, using a surface
plate or piece of glass and feeler gauge. Maximum
allowable out of flatness is:
0.076 mm (0.003 in.) for 73, 77, and 80 mm bores;
0.1 mm (0.004 in.) for 83 mm bore.
24 690 07 Rev. H
F
E
D
G
H
D
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.)
1.5 mm (0.0591 in.)
6.982/7.000 mm (0.2749/0.2756 in.)
KohlerEngines.com
Disassembly/Inspection and Service
C
B A
EXHAUST
INSERT
A
INTAKE
INSERT
B A
Intake
89°
45°
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 first. After removal,
clean valve heads, faces, and stems with a power wire
brush.
F
E
G
H
INTAKE VALVE
Exhaust
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.)
63