93
POWERHEAD
CYLINDER/CRANKCASE/PISTON
6
Piston Pin Clearance
To check the clearance, measure:
•
Piston pin outside diameter in the thrust and
axial directions.
•
Piston pin hole diameter in the thrust and axial
directions.
Pin clearance in piston pin hole:
•
Standard – 0.0001 to 0.0005 in. (0.002 to 0.013
mm)
•
Service limit – 0.0016 in. (0.040 mm)
Pin clearance in connecting rod small end:
•
Standard – 0.0002 to 0.0007 in. (0.006 to 0.019
mm)
•
Service limit – 0.0020 in. (0.050 mm)
If the clearance exceeds the service limit, replace
the piston, the piston pin and/or the connecting
rod assembly.
Piston pin outside diameter:
•
Standard – 0.4722 to 0.4724 in. (11.995 to
12.000 mm)
•
Service limit – 0.4717 in. (11.980 mm)
Piston pin hole diameter:
•
Standard – 0.4725 to 0.4728 in. (12.002 to
12.008 mm)
•
Service limit – 0.4736 in. (12.030 mm)
Connecting rod small end inside diameter:
•
Standard – 0.4727 to 0.4730 in. (12.006 to
12.014 mm)
•
Service limit – 0.4740 in. (12.040 mm)
Connecting Rod Big End Side Clearance
Measure the clearance with the connecting rod
installed on the crank pin as shown in the figure.
Connecting rod big end side clearance:
•
Standard – 0.008 to 0.028 in. (0.20 to 0.70 mm)
•
Service limit – 0.039 in. (1.00 mm)
If the measurement exceeds the service limit,
replace the connecting rod assembly and/or
crankshaft.
Connecting rod big end width:
•
0.689 to 0.701 in. (17.50 to 17.80 mm)
Crank pin width:
•
0.709 to 0.717 in. (18.00 to 18.20 mm)
Inspect the crank pin for uneven wear or damage.
Measure the crank pin outside diameter for out-of-
round or taper.
•
Out-of-round: A – B
•
Taper: a – b
006086-8
006089
006090
