Yanmar 3TNV88F - Crankshaft and Piston Specifications

ENGINE
3TNV88F Service Manual
6-7
Crankshaft and Piston Specifications
CRANKSHAFT AND PISTON SPECIFICATIONS
Crankshaft
Note: Check appropriate parts catalog for various sizes of replacement main bearing inserts.
Thrust Bearing
Piston
Inspection item Standard Limit Reference page
Bend (1/2 the dial gauge reading) –
0.0008 in.
(0.02 mm)
See Inspection of
crankshaft on page 6-44.
Connecting rod
journals
Journal outside diameter
1.8879 - 1.8883 in.
(47.952 - 47.962 mm)
1.8859 in.
(47.902 mm)
Bearing inside diameter
1.8898 - 1.8909 in.
(48.000 - 48.026 mm)
–
Bearing insert thickness
0.0587 - 0.0591 in.
(1.492 - 1.500 mm)
–
Oil clearance
0.0015 - 0.0029 in.
(0.038 - 0.074 mm)
0.0059 in.
(0.150 mm)
Main bearing
journal
Journal outside diameter
1.9666-1.9670 in.
(49.952-49.962 mm)
1.9646 in.
(49.902 mm)
See Inspection of
crankshaft on page 6-44.
Bearing inside diameter
1.9685 - 1.9693 in.
(50.000 - 50.020 mm)
–
Bearing insert thickness
0.0785 - 0.0791 in.
(1.995 - 2.010 mm)
–
Oil clearance
0.0015 - 0.0027 in.
(0.038 - 0.068 mm)
0.0059 in.
(0.150 mm)
Inspection item Standard Limit Reference page
Crankshaft end play
0.0051 - 0.0091 in.
(0.13 - 0.23 mm)
0.0110 in.
(0.28 mm)
See Removal of crankshaft
on page 6-39.
Inspection item Standard Limit Reference page
Piston outside diameter
(Measure at 90° to the piston pin.)
3.4622 - 3.4634 in.
(87.940 - 87.970 mm)
3.4604 in.
(87.895 mm)
See Inspection of pistons,
piston rings and wrist pin
on page 6-41.
Piston diameter measure location
(Upward from the bottom of the piston.)
0.9449 in.
(24 mm)
–
Piston pin
Hole inside diameter
1.0236 - 1.0240 in.
(26.000 - 26.009 mm)
1.0252 in.
(26.039 mm)
See Inspection of pistons,
piston rings and wrist pin
on page 6-41.
Pin outside diameter
1.0234 - 1.0236 in.
(25.995 - 26.000 mm)
1.0222 in.
(25.965 mm)
Oil clearance
0.0000 - 0.0006 in.
(0.000 - 0.014 mm)
0.0029 in.
(0.074 mm)
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