Characteristic
Maximum allowable run-out:
0.1 mm
- In case of irregularities, replace the head.
- Check the sealing surfaces for the intake and ex-
haust manifold.
- Check that the camshaft and the rocker pin ca-
pacities exhibit no wear.
- Check that the head cover surface is not worn.
- Check that the coolant sealing pad exhibits no
oxidation.
Inspecting the timing system components
- Check that the guide shoe and the tensioner shoe
are not worn out.
- Check that the crankshaft pinion and the cam-
shaft timing gear and crankshaft pinion exhibit no
wear.
In case of wear of the sliding blocks, replace them.
In case of wear of the chain or rim, replace the en-
tire unit.
N.B.
IF THE CHAIN HAS DAMAGED THE PINION, REPLACE THE CRANKSHAFT AS DESCRIBED IN
CHAPTER CRANKCASE AND CRANKSHAFT.
Chain tensioner:
- Remove the centre screw with the washer and
the tensioner spring. Check that the one-way
mechanism is not worn.
- Check the condition of the tensioner spring.
- If examples of wear are found, replace the whole
assembly.
Inspecting the valve sealings
- Visually inspect the valve sealing surface.
CAUTION
DO NOT REVERSE THE FITTING POSITIONS OF THE VALVES (RIGHT - LEFT).
Engine MP3 400 i.e.
ENG - 62
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