TOHATSU BFT115A Service Manual page 445

Install new valve guides (1) from the valve spring side
of the cylinder head.
Drive each valve guide to the specified height,
measured from the top of the valve guide to the cylinder
head as shown.
TOOL:
Valve guide driver, 5.35 × 9.7 (2) 07742-0010100
Valve guide installation height:
IN: 15.20 – 16.20 mm (0.598 – 0.638 in)
EX: 15.50 – 16.50 mm (0.610 – 0.650 in)
After installation, ream the new valve guide from the
combustion chamber side, using the special tool.
Coat the reamer and valve guide with cutting oil.
Rotate the reamer clockwise through the valve guide for
the full length of the reamer.
Continue to rotate the reamer clockwise while removing
it from the valve guide.
Turn the special tool (valve guide reamer, 5.525 mm)
clockwise, never turn it counterclockwise. Continue to
turn it clockwise as you lift it from the valve guide.
TOOL:
Valve guide reamer, 5.525 mm (1) 07HAH-PJ70100
Thoroughly clean the cylinder head to remove any
cutting residue.
Check the valve guide bore; it should be straight, round
and centered in the valve guide, insert the valve and
check operation. If the valve does not operate
smoothly, the guide may have been bent during
installation.
Replace the valve guide (page 14-52) if it is bent or
damaged.
Check the Valve Stem-to-Valve Guide Clearance (page
14-46).
CYLINDER HEAD
(2)
(1)
VALVE
GUIDE
PROJECTION
HEIGHT
(1)
CORRECT
CYLINDER
HEAD
INCORRECT
14-53