83
POWERHEAD
CYLINDER HEAD
6
Valve Stem Runout
Measure the valve stem runout.
Valve stem runout:
•
0.002 in. (0.05 mm)
If the measurement exceeds the service limit,
replace the valve.
Valve Head Radial Runout
Measure the valve head radial runout.
Valve head radial runout:
•
0.003 in. (0.08 mm)
If the measurement exceeds the service limit,
replace the valve.
Valve Head Thickness
Measure the thickness of the valve head.
Valve head thickness:
•
IN / EX: 0.02 in. (0.5 mm)
If the measurement exceeds the service limit,
replace the valve.
Valve Seat Contact Width
Measure the valve seat contact width.
Remove all carbon from the valve and seat.
Coat the valve seat evenly with Prussian Blue (or
equivalent).
Install the valve into the valve guide.
Put the valve lapper on the valve head.
Rotate the valve while gently tapping the valve
contact area against the seat.
Continue coating the valve seating face with Prus-
sian Blue.
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