TOHATSU MFS 25D Service Manual page 209

37) Inspection of Piston Pins
1. Measure the piston pin outer diameter. Replace the piston
pin if less than the specified value.
Piston Pin Outer Diameter: Standard Value
16.00 mm (0.62992 in)
Functional Limit:
15.97 mm (0.62874 in)
Measure the piston pin hole inner diameter a. Replace
2.
the piston if greater than the specified value.
Piston Pin Hole a Inner Diameter: Standard Value
16.002 to 16.008 mm (0.6300 to 0.6302 in)
Functional Limit:
16.012 mm (0.6304 in)
3. Calculate the clearance between the piston pin and pin
hole. Replace the piston pin or piston if greater than the
specified value.
Clearance Between Piston Pin and Pin Hole
(Piston pin hole inner diameter - Piston pin
outer diameter):
0.002 to 0.012 mm (0.00008 to 0.00047 in)
Functional Limit:
0.040 mm (0.00157 in)
38) Inspection of Connecting Rod Small
End Inner Diameter
Measure the connecting rod small end inner diameter a.
1.
Replace the connecting rod if greater than the specified
value.
Connecting Rod Small End Inner Diameter a:
Standard Value
16.010 to 16.021 mm (0.63031 to 0.63075 in)
Functional Limit:
16.040 mm (0.6315 in)
39) Inspection of Connecting Rod Big End
Side Clearance
Measure the connecting rod big end side clearance a.
1.
Replace the connecting rod or crankshaft or both if greater
than the specified value.
Connecting Rod Big End Side Clearance a:
0.10 to 0.25 mm (0.0039 to 0.0098 in)
Functional Limit:
0.60 mm (0.0236 in)
4st 25/30 2022
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