Kohler CV1000 User Manual download pdf (Page 101)

Section 9

Inspection and Reconditioning

9.9

Overheated or Deteriorated Oil

Scored Piston and Rings

Abrasive Scratched RingsStuck, Broken Rings

Ring failure is usually indicated by excessive oil

consumption and blue exhaust smoke. When rings

fail, oil is allowed to enter the combustion chamber

ȱȱȱȱȱȱȱǯȱȱȱ

consumption can also occur when the piston ring

end gap is incorrect because the ring cannot properly

conform to the cylinder wall under this condition. Oil

control is also lost when ring gaps are not staggered

during installation.

When cylinder temperatures get too high, lacquer and

varnish collect on pistons causing rings to stick, which

results in rapid wear. A worn ring usually takes on a

shiny or bright appearance.

Scratches on rings and pistons are caused by abrasive

material such as carbon, dirt, or pieces of hard metal.

Detonation damage occurs when a portion of the fuel

charge ignites spontaneously from heat and pressure

¢ȱĞȱǯȱȱȱȱĚȱȱ

which meet and explode to create extreme hammering

ȱȱȱęȱȱȱȱǯȱȱ

generally occurs from using low octane fuels.

Preignition or ignition of the fuel charge before the

timed spark can cause damage similar to detonation.

ȱȱȱĞȱȱȱȱ

detonation damage. Preignition is caused by a hot

spot in the combustion chamber from sources such

ȱȱȱǰȱȱȱęǰȱȱ

improperly seated valve, or wrong spark plug(s).

ȱȱşȬŞȱȱȱȱ¢ȱȱȱȱ

ring damage.

Figure 9-8. Common Types of Piston Damage.

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Kohler CV1000 User Manual Page 101