TOHATSU BFT75A Service Manual page 398

dummyhead dummyhead
CAMSHAFT RUNOUT
Place V blocks or equivalent under the journal at both
ends of the camshaft.
Install the dial indicator on the camshaft, and measure
the camshaft runout by turning the camshaft.
STANDARD:
SERVICE LIMIT: 0.04 mm (0.002 in)
If the measurement exceeds the service limit, replace
the camshaft with a new one.
CYLINDER HEAD WARPAGE
Remove the carbon deposits from the combustion
chamber.
Clean off any gasket material from the cylinder head
surface.
Check the spark plug holes and valve areas for cracks.
Check the cylinder head for warpage using a straight
edge [1] and a feeler gauge [2].
SERVICE LIMIT: 0.08 mm (0.003 in)
If the measurement exceeds the service limit,
recondition the cylinder head.
CYLINDER HEAD RECONDITIONING PROCEDURE:
Apply Prussian Blue compound to the level block to
identify the warpage, and using a fine oil stone, grind
the cylinder head in a figure "8", with the warped part
being the center of the ground part.
Or use the lapping machine to recondition the cylinder
head.
CYLINDER HEAD HEIGHT
Measure the cylinder head height.
STANDARD:
119.9 – 120.1 mm (4.72 – 4.73 in)
0.03 mm (0.001 in) max.
CYLINDER HEAD
[1]
[2]
14-39