Workshop Manual

ENGINE ASSEMBLY II 4–19
PISTON PIN
Piston Pin Outside Diameter
Use a micrometer to measure the piston pin outside
diameter at several points.
If the measured piston pin outside diameter exceeds the
specified limit, the piston pin must be replace.
mm (in)
Piston Pin and Piston Clearance
Use an inside dial indicator to measure the piston pin
hole.
mm (in)
Piston Pin and Piston Pin Hole Clearance
Determine the clearance between the piston pin and the
piston pin hole by calculating the difference between the
piston pin hole diameter and the piston pin outside
diameter.
mm (in)
If an inside dial indicator is not available, use the follow-
ing procedure to check the piston pin fit.
1. Use a piston heater to heat the piston to approxi-
mately 60°C (140°F).
2. Push strongly against the piston pin with your
thumbs.
The piston pin fitting should feel tight.
Standard Limit
Piston Pin Outside 35.000–35.005 34.95
Diameter (1.3780–1.3781) (1.3760)
Piston Pin Hole Diameter Standard
4BG1, 4BG1T, 6BG1 35.015–35.023
6BG1T (1.3785–1.3789)
Standard Limit
Piston Pin and
0.010–0.023 0.050
Piston Pin Hole
(0.00039–0.0009) (0.00197)
Clearance