Kohler COMMAND CH18-745 User Manual download pdf (Page 176)

10.5

Section 10

Inspection and Reconditioning

EXHAUST

VALVE

INTAKE VALVE

EXHAUST

INSERT

INTAKE

INSERT

Seat Angle

Insert O.D.

Guide Depth

Guide I.D.

Valve Head Diameter

Valve Face Angle

Valve Margin (Min.)

Valve Stem Diameter

Dimension

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.)

Intake

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.)

Figure 10-6. 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 for defects such as

a warped head, excessive corrosion, or a 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.

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