153
POWERHEAD
CRANKSHAFT, PISTONS AND CAMSHAFT
7
surement exceeds service limit, rebore or replace
cylinder.
To check the piston to cylinder bore clearance,
measure:
•
Cylinder bore at 50 mm below the cylinder head
gasket surface.
•
Piston skirt diameter at 13 mm above the skirt
end.
•
Take measurements at a 90° angle from the pis-
ton pin.
Subtract the piston skirt measurement from the
cylinder bore measurement to determine clear-
ance.
Cylinder bore:
•
Standard: 2.7953 to 2.7961 in. (71.000 to
71.020 mm)
Piston skirt diameter:
•
Standard: 2.7941 to 2.7949 in. (70.970 to
70.990 mm)
Piston to cylinder clearance:
•
Standard: 0.0008 to 0.0016 in. (0.020 to 0.040
mm)
•
Service limit: 0.0039 in. (0.100 mm)
If measurement exceeds service limit, replace the
piston and/or the cylinder, or rebore the cylinder.
An oversize piston and rings, 0.020 in. (50 mm) is
available.
005713
005714
005715
