TOHATSU BFT115A Service Manual page 437

CYLINDER HEAD INSPECTION
VALVE SPRING FREE LENGTH
Measure the free length of the valve springs.
STANDARD:
IN: 49.64 mm (1.954 in)
EX: 49.64 mm (1.954 in)
VALVE FACE/STEM O.D.
Inspect each valve face (1) for pitting, wear, or
irregularities.
Inspect each valve stem for bending or abnormal stem
wear. Replace the valve if necessary (page 14-39).
Measure and record each valve stem O.D.
STANDARD:
IN: 5.475 – 5.485 mm (0.2156 – 0.2159 in)
EX: 5.450 – 5.460 mm (0.2146 – 0.2150 in)
SERVICE LIMIT:
IN: 5.445 mm (0.2144 in)
EX: 5.420 mm (0.2134 in)
Replace the valves if their O.D. is smaller than the
service limit (page 14-39).
VALVE GUIDE I.D.
Using the valve guide reamer (special tool), ream the
valve guides to remove any carbon deposits before
measuring.
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
Measure and record each valve guide I.D.
STANDARD:
IN/EX: 5.515 – 5.530 mm (0.2171 – 0.2177 in)
SERVICE LIMIT:
IN/EX: 5.55 mm (0.219 in)
Replace the guides if they are over the service limit
(page 14-52).
• Check the stem-to-guide clearance if the valve guide
is replaced.
CYLINDER HEAD
(1)
(1)
14-45