142
POWERHEAD
CYLINDER HEAD
Measure valve head thickness. If measurement
exceeds service limit, replace valve.
•
Standard: 0.0394 in. (1.0 mm)
•
Service limit: 0.0197 in. (0.5 mm)
Measure valve seat contact width as follows:
Coat valve seat evenly with Prussian Blue
Install valve into valve guide
Put valve lapper on valve
Rotate valve while gently tapping valve contact
area against seat
Repeat until a continuous pattern in the Prussian
Blue is seen
Measure valve seat contact width:
•
Service limit: 0.04 to 0.05 in. (1.1 to 1.3 mm)
If measurement exceeds service limit, repair valve
seat. Refer to
1.
Valve head thickness
004530
1.
Valve lapper
005679
1.
Valve seat contact area
004532
1