Remove valve cover.
Valve clearance check.
Turn propeller according to engine rotation until the valves of the second cylinder are
overlapping. Now, the valve clearance of the first cylinder may be checked (see cylinder
designation at page 3.2).
Move thickness gauge between valve shaft and setscrew. The thickness gauge must be
movable slightly "sucking". It must not jam.
Valve clearance setting.
Untighten nut of setscrew and turn setscrew until thickness gauge can be moved
slightly "sucking". Tighten nut and check valve clearance again, readjust, if necessary.
Order of adjustment
The order of adjustment is: 1 - 3 - 2 - 4, i.e. the propeller has to be turned by 180° after
the first cylinder has been set, in order to check the valve clearance of the third cylinder.
After another 180° turn according to the engine rotation, the valve clearance of the
second cylinder may be checked, etc.
Valve clearance: Intake Valve 0.20 mm
Exhaust Valve 0.20 mm
Check cylinder head cover gaskets and replace, if necessary.
8.13 Check of Valve Shaft Projecting Length
Remove cylinder head covers.
Dismount rocker arm shafts.
Measurement of valve shaft projecting length by means of measuring device P/N: 803.001.130.
If the projecting length is less than 24 mm for the intake and exhaust valve the cylinder
heads have to be replaced by new ones.
Install rocker arm shafts.
Apply sealant P/N: 708.413.004 to the sealing face of the bearing blocks.
Position rocker shafts on the studs.
Insert push rods into the cavities of the rocker arms.
Pre-assemble spring washers and M8 nuts (strength class 10).
Ensure that the pushrods are also seated in the camshaft followers.
Torque nuts to 25 Nm
Note:
Turning the pushrods while tightening the bolts will prevent the pushrods from becoming
unseated at the cam followers.
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