D439E Service Manual 2. Engine Mechanical System (D439E)
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3. Measure the clearance between piston pin and
piston hole by measuring the inner diameter of
piston pin (1) and piston boss.
Inner diameter of piston boss : 38 mm
Outer diameter of piston pin : 38 mm
Clearance Reference : 0.007 ~ 0.021 mm
Clearance Limit : 0.05 mm
4. Measure the clearance between piston pin and
connecting rod end.
Outer diameter of piston pin : 38 mm
Inner diameter of connecting rod end : 38 mm
Clearance Reference : 0.025 ~ 0.046 mm
Clearance Limit : 0.1 mm
Piston Ring
1. Check the piston ring for any damage, unusual
wear or breakage. If damaged, replace the ring.
2. When replacing the piston, replace the piston pin
together.
3. Measure the clearance between piston ring and
the wall of the ring groove, using a feeler gauge.
Piston ring Standard Limit
Ring No.1 0.106 ~ 0.170 mm 0.2 mm
Ring No.2 0.07 ~ 0.11 mm 0.15 mm
Oil ring 0.03 ~ 0.07 mm 0.15 mm
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