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Design and Function
Valve system
The valves are made of chrome-nickel steel. The
valve stems are chromed.
The valve seats of special steel are replaceable. The
seats are available are as replacement parts as
standard size and as over-sized. The over-sized seat
has a 2 mm larger outer diameter and is used if new
valve seats need to be cut in the cylinder head.
Camshaft
The camshaft is carried in seven bearings (31/32-se-
ries 5 bearings). The bearings are replaceable, the
new bearings should be bored to the right size and
aligned after pressing in.
Transmission
The transmission consists of gear wheels with helical
teeth.
Transmission
1 Crankshaft gear
2 Intermediate gear for oil pump
3 Intermediate gear for oil pump
4 Intermediate gear for camshaft
5 Camshaft gear
6 Injector pump and water pump gear
Crankshaft
The crankshaft is supported on seven main bearings.
The thrust bearing consists of thrust washers located
each side of the central main bearing. On late model
engines, the thrust washers are integrated into the
central main bearing.
The crankshaft is statically and dynamically balanced.
The crankshaft nose is provided with a so-called poly-
gon profile, and the rear end has a flange to which the
flywheel is screwed.
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