TOHATSU BFT75A Service Manual page 397

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CYLINDER HEAD
CAMSHAFT JOURNAL I.D.
Measure the I.D. of each camshaft journal.
STANDARD:
41.995 – 42.019 mm (1.6533 – 1.6543 in)
CAMSHAFT OIL CLEARANCE
Calculate the difference between the camshaft journal
O.D. and the cylinder head journal I.D.
STANDARD:
0.045 – 0.084 mm (0.0018 – 0.0033 in)
SERVICE LIMIT:
0.100 mm (0.0039 in)
If the measurement exceeds the service limit, replace
the camshaft with a new one and recheck.
If the measurement still exceeds the service limit after
replacing the camshaft, replace the cylinder head with a
new one (page 14-22).
CAMSHAFT AXIAL CLEARANCE
Check the camshaft axial clearance with the oil pump
mounted on the outboard motor.
Install the rocker shaft on the cylinder head and tighten
the rocker shaft bolts to the specified torque (page 14-
26).
Put the camshaft at the top dead center of the
compression stroke of the No.1 piston (with the dowel
pin on your side).
Install the dial indicator.
Check the camshaft axial play by moving the camshaft
up and down with a screwdriver.
STANDARD:
0.05 – 0.25 mm (0.002 – 0.010 in)
SERVICE LIMIT:
0.50 mm (0.020 in)
If the measurement exceeds the service limit, replace
the oil pump body with a new one and recheck.
If the measurement still exceeds the service limit after
replacing the oil pump body, replace the camshaft with
a new one.
14-38
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