Kohler COMMAND CH18-745 User Manual download pdf (Page 175)

10.4

Section 10

Inspection and Reconditioning

The final cleaning operation should always be a

thorough scrubbing with a brush and hot, soapy water.

Use a strong detergent that is capable of breaking

down the machining oil while maintaining a good level

of suds. If the suds break down during cleaning,

discard the dirty water and start again with more hot

water and detergent. Following the scrubbing, rinse the

cylinder with very hot, clear water, dry it completely,

and apply a light coating of engine oil to prevent

rusting.

Measuring Piston-to-Bore Clearance

Before installing the piston into the cylinder bore, it is

necessary that the clearance be accurately checked.

This step is often overlooked, and if the clearances are

not within specifications, engine failure will usually

result.

NOTE: Do not use a feeler gauge to measure piston-

to-bore clearance – it will yield inaccurate

measurements. Always use a micrometer.

Use the following procedure to accurately measure the

piston-to-bore clearance:

1. Use a micrometer and measure the diameter of

the piston 6 mm (0.24 in.) above the bottom of

the piston skirt and perpendicular to the piston

pin. See Figure 10-4.

3. Piston-to-bore clearance is the difference

between the bore diameter and the piston

diameter (step 2 minus step 1).

Flywheel

Inspection

Inspect the flywheel for cracks and the flywheel

keyway for damage. Replace the flywheel if it is

cracked. Replace the flywheel, the crankshaft, and the

key if flywheel key is sheared or the keyway is

damaged.

Inspect the ring gear for cracks or damage. Kohler

does not provide the ring gear as a serviceable part.

Replace the flywheel if the ring gear is damaged.

Cylinder Head and Valves

Inspection and Service

After cleaning, check the flatness of the cylinder head

and the corresponding top surface of the crankcase,

using a surface plate or piece of glass and feeler

gauge as shown in Figure 10-5. The maximum

allowable out of flatness is 0.076 mm (0.003 in.).

6 mm (0.24 in.)

Measure 6 mm above the

Bottom of Piston Skirt at

Right Angles to Piston Pin

Figure 10-4. Measuring Piston Diameter.

2. Use an inside micrometer, telescoping gauge, or

bore gauge and measure the cylinder bore. Take

the measurement approximately 63.5 mm

(2.5 in.) below the top of the bore and

perpendicular to the piston pin.

Figure 10-5. Checking Cylinder Head Flatness.

Carefully inspect the valve mechanism parts. Inspect

the valve springs and related hardware for excessive

wear or distortion. Check the valves and valve seat

area or inserts for evidence of deep pitting, cracks, or

distortion. Check clearance of the valve stems in the

guides. See Figure 10-6 for valve details and

specifications.

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Kohler COMMAND CH18-745 User Manual Page 175

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