8
TERMS AND SYMBOLS
Workshop manual RR 4T - 400 - 450 - 525
When performing these oper-
ations, flammable vapours
can be released and metal
parts can be ejected at high
speed. It is therefore neces-
sary to:
- Avoid working near sparks
or open flames.
- Wear protective clothing.
- Wear protective goggles.
IMPORTANT
Whenever a worn cylinder
part needs to be replaced,
we recommend checking
and if necessary replacing all
the parts that are related to it.
In particular, the following
parts should always be re-
placed at the same time:
- Piston, piston rings and
piston pins.
- Valves, valve springs,
valve cotters, caps and
thrust washers.
- Valve guides with related
valves, springs, caps,
valve cotters and thrust
washers.
- Crankshaft bearings.
- Any part subject to even
wear.
To keep the engine in perfect
running order, ensure that all
fits are within the prescribed
tolerances. A close fit can
lead to seizure as soon as
the moving parts heat up; on
the other hand, a loose fit
causes vibrations that accel-
erate the wear and tear of
moving parts.
NOTE
Whenever the words left, right, upper,
lower, front and rear are used, reference
is made to the vehicle in its normal direc-
tion of travel.
Avoid disposing of the parts in the envi-
ronment.
NOTE
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