Vetus M Series Operation Manual page 74

6 Maintenance
M3
43 Remove rocker cover
• Remove the 2 nuts of the rocker cover.
• Complete the following steps:
72
Mark on
M3
gearcase
TDC mark
10
44 Locating TDC
• Locate the Top Dead Center (TDC), at the
end of the compression stroke, for cylinder
1 by barring the engine slowly until the TDC
marks of the engine block and the crank
pulley match.
Note: There are two TDC's e.g. compression
and suction. At the TDC at the end of the com-
pression stroke the rocker arm does not move
when the crank pulley is rotated a little.
Checking valve clearance
Every 500 operating hours.
M3
24
45 Adjusting valve clearance
Cylinders are numbered consecutively, begin-
ning at the front end.
• Check valve clearance at cylinder 1 and ad-
just if necessary.
• Rotate the crankshaft 240° clockwise and
check valve clearance at cylinder 3.
• Again rotate the crankshaft 240° and check
valve clearance at cylinder 2.
Valve clearance:
Inlet 0.25 mm
(0.010")
Exhaust 0.25 mm
(0.010")
10 1.0 x 5.5