PT 2/3 /... Maintenance
wc_tx000013gb.fm 30
4.15 Valve Clearances (Hatz)
See Graphic: wc_gr000034
Only carry out adjustments when the engine is cold (42–62°F / 10–
30°C).
4.15.1 Remove air cleaner cover and noise-insulating hood.
4.15.2 Remove any contamination adhering to the cover for the cylinder head.
4.15.3 Pull oil feed knob as far as the limit stop.
4.15.4 Remove screws (a) and take off the cylinder head cover with gasket
(b).
4.15.5 Remove rubber cap from the inspection hole cover (c).
4.15.6 Turn the engine over in the normal direction of rotation until the valves
are in the overlap position (exhaust valve not yet closed, inlet valve
starts to open).
4.15.7 Turn crankshaft through 360° in direction of rotation and position it
precisely at the TDC mark (d).
4.15.8 Check valve clearance with feeler gauge (e).
Note:
Refer to the Technical Data for valve clearances.
4.15.9 If valve clearances require adjusting, slacken off screw (f) and turn hex
nut (g) until feeler gauge can be pulled through with just slight
resistance when screw is retightened.
4.15.10 Check the O-rings (h) on the oil feed for cracks and/or damage.
4.15.11 Fit cover for cylinder head and tighten evenly, always using a new
gasket.
4.15.12 Re-attach parts previously removed from engine.
Note:
Don't forget to replace the rubber cap at the inspection hole
cover.
4.15.13 Carry out a brief test run, then check the cover for leaks.
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