Engine System
43
Service Manual – PBU Propane Floor Burnisher
• If the valve seating pattern is not within limits,
re-cut the valve seat and valve face with the
following parameters:
Valve Seat (Intake & Exhaust)
Seat: 45° @ 0 8 ~ 1 4 mm (0 031 ~ 0 055 in )
Relief: 32
˚
3 Inspect the valves for damage and the following parameters:
Valve Margin Service Limit (Intake & Exhaust):
0 35 mm (0 0138 in)
Valve Stem Runout Service Limit: (Intake & Exhaust)
TIR 0 05 mm (0 002 in )
• Valve Stem Diameter
• Measure the diameter of the valve stem in two directions at right
angles, at four different positions on the stem
Valve Stem Diameter Service Limit:
Inlet 5 95 mm (0 234 in )
Exhaust 5 93 mm (0 233 in )
Seat Width
Stem
Margin
Face
Head
Margin
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