Fig.1 - Engine cylinder block.
Fig. 2 - Oil chamber for cylinder cooling.
Fig. 3 - Piston cooling nozzles.
Fig. 4 - Piston cooling nozzle assembly.
Engine cylinder block
The one-piece engine cylinder block is a particularly sturdy cas-
ting. All oil passages necessary to piston lubrication and cooling
are directly machined in it.
Whenever the engine is stripped, ensure that all passages are not
obstructed. If necessary perform a thorough cleaning by compres-
sed air after the block has been soaked in a water and soda or
Diesel oil bath for some time, and all passage caps have been
removed.
It is most important to make sure that neither the piston cooling
nozzles nor the cylinder bottom cooling throats are obstructed as
this could prevent the engine from running smoothly.
If the piston cooling nozzles have been removed, pay particular
attention on reassembly so as to avoid any interference with piston
stroke, since this would certainly result in a serious engine da-
mage. For this reason we recommend using the special tool no.
5.9030.658.4, enabling the nozzles to be correctly positioned.
The tappet seat surfaces should be completely smooth.
Tappets must be fitted before installing the camshaft and with the
cylinder block overturned. After fitting tappets, ensure these can
move freely.
Installing bushings into the camshaft journals
Ascertain the camshaft journal bushings are correctly positioned,
i.e. thoroughly aligned with the oil passages machined in the
cylinder block.
Bushings should be positioned so that they may recess about 2
mm from the holes in the block, except the last bushing on flywheel
side which should be flush with the block wall.
Fig. 5 - Camshaft journal bushings.
engine
cylinder block
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