34
Model Code Page
21. Engine
1. 11. 2000
95--115
X100--X120
210 12
Engine, description
General
T h e Valmet 2 0 --- series e n g i n e s ( 3 --- , 4 --- , or 6 --- c y l i n d e r s ) are
water---cooled, four stroke, turbocharged, direct---injection
in---line diesel engines. Technical values, see page 210/3.
The engines have a rigid and ribbed cylinderblock. The crank
mechanism is designed for supercharging. The cylinder
liners are wet and supported at the middle, the cylinder head
bolts are high tensile bolts.
Cylinder block
The cylinder block is the main body o f the engine, to which
otherengine parts are attached. Wet and replaceable cylinder
liners are supported at the middle which reduces vibrations
and directs coolant circulation mainly to the upper part of the
liners.
The seal between the cylinder liner lower part and the cylinder
block is achieved by three o---rings, which are fitted in grooves
in the liner. The upper part is s ealed by the cylinder head
gasket.
The camshaft is located in the cylinder block. The camshaft
front bearing location is fitted with a separate bearing sleeve.
The remaining bearing locations are machined directly in the
cylinder bloc k. The dri lling for the camshaft rear end is cov-
ered with a plug.
There are spaces on both sides of the rear main bearing for
guide bearing shims (the crankshaft thrust bearings).
Flywheel housing
The flywheel housing is fitted at t he rear end of the cylinder
block. The seal for the crankshaft rear end is placed in a bore
in the housing. The starter motor fixing point is fitted in the fly-
wheel housing.
The lower face of the flywheel housing functions as a sealing
surface for the oil sump gasket. This means that the lower face
of the cylinder bloc k must be level with the flywheel housing.
When fitting the flywheel housing, its positio n is determined
by tension pins.
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