Release 00 - 11/2018
page 40
Engine WBE 170
Workshop Manual
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15. ENGINE BLOCK - External operations
15.2. Adjusting the valve clearance
WARNING: The adjustment must be made
with the engine is cold.
1 -
Remove the cover and demount the spark plug
[ 15.1].
2 - Remove the cover (5) which is secured with four
screws (6) and remove the gasket (7).
3 - Manually set the piston to the TDC (Top Dead
Centre) of the compression stroke so that both
valves are closed.
4 - Use a feeler gauge (8) to check the gap betwe-
en the rocker arm and the tip of the valve stem; the
gauge should pass between without forcing and
without a further gap.
5 - Slack is adjusted by loosening the nut (9) and
using suitably adjusting the register nut (10) to
obtain the following values:
Inlet - IN = 0,10 - 0,15 mm
Exhaust - EX = 0,15 - 0,20 mm
6 - Following adjustment, check that the pushrods
(11) are properly inserted in the rocker arm housings
(12) and always fully tighten the dowel (9).
7 - When reassembling check the condition
of the gasket (7) of the cover (5) and replace it if
it is damaged. Tighten the “cross” screws (6) to the
indicated values.
8 - Assemble the spark plug [ 15.1].
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