Technical data

64
Repair instructions
Inspecting the timing gears
Clean the gear wheels and other components in the
timing gear, and inspect them carefully. Replace any
gear wheels which are heavily worn or damaged.
During assembly, all clearances must be checked.
Max. permitted gear flank clearance is 0.17 mm.
Check the radial clearance and end float of the idler
wheel.
End float .................................... 0.05–0.15 mm
Radial clearance ........................ 0.025–0.082 mm
Clean the timing gear cover and the mating surface of
the cover on the engine (timing cover)
Nitrocarburised timing gear wheels
Since some of the timing gear wheels are more heavi-
ly loaded in some engine versions than in other ver-
sions, the timing gear wheels on these engines are
made to withstand heavier loading, by nitrocarburising
them.
WARNING! Nitrocarburised gears must not
be installed in contact with quenched and
tempered gears.
Always observe the spare part catalogue when replac-
ing gears. If you are not sure about the grade of a
gear, nitrocarburised gears can be recognised by the
following signs:
Nitrocarburised gears have a matte grey to yel-
low/grey colour.
The gears are marked with white oil-resistant
paint or have an “N” or NITRO punched on them.