Kohler KT19 series II User Manual

SECTION 7
DISASSEMBLY
Detonation damage occurs when a portion of the
fuel charge ignites spontaneously from heat and
pressure shortly after ignition. This creates two
flame fronts which meet and explode to create
extreme hammering pressures on a specific area of
the piston. Detonation generally occurs from using
fuels with too low an octane rating.
Preignition or ignition of the fuel charge before
the timed spark can cause damage similar to
Stuck, Broken Rings
Abrasive Scratched Rings
detonation. Preignition damage is often more
severe than detonation damage-often, a hole is
quickly burned right thru the piston dome by
preignition. Preignition is caused by a hot spot in
the combustion chamber from sources such as:
glowing carbon deposits, blocked fins, improperly
seated valves or wrong spark plugs.
See Figure 7-10 for some common sources of piston
and ring damage.
Worn Rings (Shiny Surface)
Scored
Piston and Rings
Figure 7-10. Common Sources Of Piston And Ring Damage
Pistons And Rings- Service
Service ring replacement sets and piston assem-
blies are available in the standard size, and in
.010", .020" and .030" oversize sets. The service
oversize piston assemblies are used only when the
48
cylinder has been rebored to the corresponding
oversize.
NOTE: If engine is .003 oversize and piston is to be
replaced, use .003 piston and STD service rings.

Kohler KT19 series II Specifications

General

Brand	Kohler
Model	KT19 series II
Category	Engine
Language	English