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ENGINE
3.5.3.
CHECKING THE COMPONENTS
HEADS
Make sure that:
•
Surfaces in contact with the cover and cylinder are not
scratched or damaged to the point where they
compromise sealing.
•
Check that clearance between valve guide holes and
valve stems is within the recommended limit.
•
Check valve seat condition.
VALVE GUIDES
Use a drift to remove the valve guides from the heads.
The valve guides should be changed only if clearance
between them and the valve stem cannot be eliminated by
changing the valves only.
To fit the valve guides to the head proceed as follows:
•
Heat up the head in an oven at about 60°C (140°F).
•
Lubricate the valve guides.
•
Fit the circlips.
•
Press the valve guides using a drift.
•
Using a bore reamer, grind the holes where the valve
stem slides, taking the inner diameter to the specified
value. Interference fit of the seat on the head and valve
guide should be 0.046 - 0.075 mm (0.0018 - 0.0030 in)
INNER ø OF
VALVE GUIDE
Intake
8.000-8.022 (0.3150-0.3158)
Exhaust
8.000-8.022 (0.3150-0.3158)
3 - 30
VALVE-TO-GUIDE COUPLING
mm (in)
7.972÷7.987 (0.3139÷0.3145)
7.965 ÷ 7.980 (0.3136 ÷ 0.3142)
VALVE STEM ø
mm (in)
Engine V1100
ASSEMBLY
CLEARANCE
mm (in)
0.013-0.050 (0.0005÷0.0020)
0.020 ÷ 0.057 (0.0008 ÷ 0.0022)
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