3.8HOW TO USE THIS SECTION
TOP END REPAIR
NOTE
During top end disassembly, the engine may be left in the
chassis for service.
If servicing only cylinder head components, pistons, cylinders
and/or upper rod bushings, two options are available depending
upon engine status. See 3.13 REMOVING ENGINE FROM
CHASSIS.
• 3.9 TOP END SERVICE, Engine in Chassis.
• 3.9 TOP END SERVICE, Engine Removed from Chassis.
BOTTOM END REPAIR
NOTE
Servicing components in the cam compartment requires only
partial disassembly. This can be done with the engine left in
the chassis.
After disassembling as far as the cylinder heads you may find
that bottom end repair is necessary. Bottom end service may
require either partial or complete disassembly of the engine.
• To service the cam compartment, see 3.10 BOTTOM END
SERVICE, Engine in Chassis.
• To service components in the flywheel compartment, the
engine must be removed and the crankcase halves split.
See 3.10 BOTTOM END SERVICE, Engine Removed
From Chassis.
TYPICAL SYMPTOMS
Symptoms indicating a need for engine repair are often mis-
leading, but generally if more than one symptom is present,
possible causes can be narrowed down to make at least a
partial diagnosis. An above normal consumption of oil, for
example, could be caused by several mechanical faults. But
when accompanied by a blue-gray smoke from the exhaust,
and when low compression is present, it indicates the rings
need replacing. Low compression by itself, however, indicates
improperly seated valves, not worn rings.
Certain "knocking" noises may be caused by loose bearings,
others by piston slap, a condition where piston or cylinder or
both out of tolerance, allowing the piston to slap from front to
rear of the cylinder as it moves up and down.
Most frequently, valves, rings, pins, bushings, and bearings
need attention at about the same time. If the symptoms can
be narrowed down through the process of elimination to indicate
that any one of the above components is worn, it is best to give
attention to all of the cylinder head and cylinder parts.
3-16 2008 Dyna Service: Engine
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