6. CYLINDER / PISTON
6.1 SERVICE INFORMATION
GENERAL
Camshaft lubrication oil is fed to the cylinder head through an oil orifice in the cylinder head and engine
case. Before installing the cylinder head, make sure the orifice is not clogged and the gasket, O-ring, and
dowel pins are in place.
ITEM STANDARD
SERVICE
LIMIT
Cylinder
I.D.
57.400 - 57.410
57.50
TAPER
0.10
OUT OF ROUND
0.10
WARPAGE ACROSS TOP
0.10
Piston
Piston pin
Piston rings
PISTON O.D.
57.3075 - 57.3095
56.500
PISTON PIN BORE
15.002 - 15.008
15.04
PISTON PIN O.D.
14.994 – 15.000
14.960
PISTON-TO-PIN CLEARANCE
0.002 – 0.014
0.02
PISTON-TO-PIN CLEARANCE
TOP 0.015
–
0.050 0.12
PISTON RING-TO-RING GROOVE
CLEARANCE
SECOND 0.015
–
0.050
0.12
TOP/SEC 0.10
–
0.25
0.5
PISTON RING END GAP
OIL
0.2 –0.7
CYLINDER-TO-PISTON CLEARANCE
0.0005 – 0.1025
0.1
CONNECTING ROD SMALL END I.D.
15.010 – 15.028
15.06
6.2 TROUBLESHOOTING
Low or unstable compression
•
Worn cylinder or piston rings
Overheating
•
Excessive carbon build-up on piston or combustion chamber wall
Knocking or abnormal noise
•
Worn piston and cylinder
•
Excessive carbon build-up
Excessive smoke
•
Worn cylinder, piston, or piston rings
•
Improper installation of piston rings
•
Scored or scratched piston or cylinder wall
•
Damaged valve stem seal
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