4
How to clean parts
Clean all parts with suitable biodegradable solvents and
then dry them with compressed air.
Clean the assemblies before disassembling them as well
as the individual parts after disassembly. Also clean each
part before reassembly.
Fits
To keep the engine in perfect running order, ensure that all
fits are within the prescribed tolerances. The use of re-
duced tolerances can lead to seizure; on the other hand,
using excessive tolerances causes vibrations that acceler-
ate the wear and tear of components.
Part fitting guidelines
When refitting parts, follow the removing procedures in re-
verse order, paying attention to any specific operations that
are pointed out. Always replace gaskets, oil seals, metal
retainers, sealing washers made of deformable materials
and self-locking nuts.
Bearings are designed to last a given number of hours. It is
therefore advisable to periodically replace them, all the
more so that their wear is difficult to verify. This approach
is recommended in addition to the dimensional checks of
the various components mentioned in the related para-
graphs.
It is essential to thoroughly clean all components. Bearings
and other wear-prone parts should be lubricated with en-
gine oil before they are fitted. Screws and nuts must be
tightened to the prescribed torques.
The following is a description of the removal, overhauling
and refitting operations to be used for the different assem-
blies and subassemblies that make up the engine, in a se-
quence that leads to the complete disassembly of the en-
gine.
Remove the engine from the frame as described in the re-
lated paragraph. Drain the oil from the sump, remove the
spark plugs taking care to block up their holes with clean
rags so as to prevent small items (washers, etc.) from
falling into the engine.
Workshop manual RR 4T - 400 - 450 - 525
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