TOHATSU BFT250A Service Manual page 447

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CYLINDER HEAD SURFACE
WARPAGE
Take care not to damage (scores, scratches, etc.) the
mating surface with the gasket.
Measure the surface warpage using a straight edge [1]
and a feeler gauge [2] as shown.
STANDARD:
0.07 mm (0.003 in) Max.
SERVICE LIMIT:
0.10 mm (0.004 in)
CONNECTING ROD BOLT
Measure the bolt O.D. at the two points as shown and
calculate the difference between the measurements.
STANDARD:
0 – 0.10 mm (0 – 0.004 in)
If the difference exceeds the standard value, replace
the connecting rod bolt.
Measure the O.D. of all connecting rod bolts.
CYLINDER BLOCK
MEASUREMENT POINTS
[2]
35 mm (1.4 in)
20 mm
(0.8 in)
[1]
15-33