TOHATSU BFT75A Service Manual page 422

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CONNECTING ROD SMALL END-TO-
PISTON PIN CLEARANCE
Measure the connecting rod small end I.D.
STANDARD:
Calculate the gap between the piston pin O.D. and the
connecting rod small end I.D.
STANDARD:
CONNECTING ROD BIG END AXIAL
CLEARANCE
Measure the axial clearance at each connecting rod big
end.
STANDARD:
SERVICE LIMIT:
If the measurement exceeds the service limit, replace
the connecting rod and the connecting rod cap with the
new ones as a set, and recheck.
If the measurement still exceeds the service limit after
replacing the connecting rod and the connecting rod
cap, replace the crankshaft with a new one.
THRUST WASHER SIDE CLEARANCE
Measure the clearance between the No.4 main journal
thrust washer and the crankshaft.
STANDARD:
SERVICE LIMIT:
If the measurement exceeds the service limit, check the
thrust washer and the cylinder block thrust surface.
Replace the thrust washer with a new one if necessary
and recheck.
If the measurement still exceeds the service limit after
replacing the thrust washer, replace the crankshaft with
a new one.
CRANKSHAFT MAIN JOURNAL O.D.
Measure the crankshaft main journal [1] O.D.
STANDARD:
17.964 – 17.977 mm (0.7072 – 0.7078 in)
0.019 – 0.036 mm (0.0007 – 0.0014 in)
0.15 – 0.35 mm (0.006 – 0.014 in)
0.40 mm (0.016 in)
0.10 – 0.35 mm (0.004 – 0.014 in)
0.45 mm (0.018 in)
49.976 – 50.000 mm (1.9676 – 1.9685 in)
CYLINDER BLOCK
[1]
15-21