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7. Cvlinder Head/Cvlinder/Piston
Service Information
Troubleshooting
Camshaft Rernoval
Camshaft Holder Disassembly/Assembly
Service Inforrnation
7-1
7-1
7-2
7-5
Camshaft Installation
Cylinder Head Removalllnstallation
Cylinder Head Disassembly/Assembly
Cylinder, Piston Removalllnstaflation
7-6
7-10
7-11
7-12
Camshaft service can be doné with the engine in the frámé.:
-
•
Camshaft lubricating
oil
is fed throu.gh oil passages in the cylinder head. Clean the oil passages before assembling the
cylinder head.
•
Clean all disassembled parts with clean solvent and dry
thern
by blowing them off with compressed air before inspection.
•
Before reassembly, lubricate the camshaft bushings and cam lobes with a molybdenum solution (half engine oi! andhalf
molybdenum grease).
,
•
When disassembling, mark and store the disassembled partsto
ensure that they are reinstalled in their proper locations.
Troubleshoo'ting
•
Engine top-end problems usually affect engine períormanca.These can be diaqnosed by a compression or laak-down test,
, or by tracing noises to the top-end with a sounding rod
or stethoscope ,' .
If
performance is poor atlow speeds, check for white smoke in the craokcase breather tube. If the tu be is smoky, check for
a seized piston ringo
Compression Too low, Hard Starting Or Poor Performance
At Low Speed
Valves
-
Incorrect valve adjustment
Surned or bent valves
-
Incorrect valve timing
-
Broken valve spring
- Une ven valve seating
Cylinder head
-
Leaking or damaged head gasket
-
Warped or cracked cylinder head
Cylinder, piston
-
Leaking cylinder head gasket
-Loose spark plugs
-
Worn, stuck or broken pisten rings
-
Worn or damaged cylinder and piston
Compression Too High, Overheating Or Knocking
Excessive carbon built-up in cylinder head
or
on top
of
piston
Excessive
Smoke
•
Cylinder head
-
Worn
valve stem or valve guide
-
Damaged stem seal
Cylinder, piston
-
Worn cylinder, piston, or piston rinqs
-'- Improper installation of piston rings
-
Scored or scratched piston or cylinder wall
Excessive Noise '
•
Cylinder head
-
lncorrectvalve adjustrnent
-
Sticking valve or broken valve spring
-
Damaged or worn camshaft
-
Loose or worn cam chain
-
Worn or damaged cam chain
-
Worn or damaged cam chain 1ensioner
-
Worn cam sprocket teeth
-
Worn rocker arrn and/or shaft
Cylinder, piston .
-
Worn cylinder and pisto
n
-
Worn piston pin and piston pin hole
Rough Id'le
•
Low cylinder cornpression
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