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Head unit: checks and adjustments
Note
Engine timing should be checked after replacing such component parts as camshafts, valves or timing belt rollers or
when overhauling badly worn engines.
Remove the spark plugs and fit tool (E) part no.
88765.1297
in the spark plug hole and determine piston top dead
center with gauges (C) part no.
88765.1058
and timing gauge (hub part no.
88713.0123
and degree wheel (G)
part no.
98112.0002
).
With the camshaft at rest position, take up valve opening clearance fitting a suitably sized feeler gauge (D) between
opening rocker arm and opening shim.
Check that camshaft can rotate. If it runs hard, use a smaller feeler gauge.
In this condition, the piston of the horizontal cylinder is at TDC with the valves fully closed - verify looking at gauge
(E). Set dial gauges (C) to zero.
Tension belts to:
- Horizontal belt
145
Hz;
- Vertical belt
160
Hz.
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