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REMOVING THE CYLINDER A N D PISTON
W i t h the cylinder head removed, the barrel can be raised vertically to clear the holding
down studs.
Before doing so, position the engine with the piston on the top of its stroke,
have available a piece of clean rag.
put into the throat of the crankcase (under the piston) as a precaution against a broken
ring falling into the crankcase, then lift the cylinder clear of the four studs passing
through it.
Make a mark inside the piston to indicate front,
The gudgeon pin is a sliding fit in both the piston and connecting rod. Use round nose
pliers to compress and extract the circlip (It is immaterial which one is removed) then
push out the gudgeon pin and lift the piston off the connecting rod.
Do not disturb the piston rings unless absolutely necessary.
If new piston rings are fitted and if they are obtained from our Spare Parts Department
they are ready for fitting, as the ring gap is allowed for during manufacture.
The top compression ring is chromium plated and has a slightly tapered extension.
When new, the word TOP is etched on the ring face to indicate which way it should be
fitted. Fit first the scraper or oil control ring, then the two compression rings, to avoid
breakage do not expand these rings unnecessarily.
REFITTING THE PISTON
Before refitting the piston apply a little oil to the gudgeon pin, also to the bosses for the
gudgeon pin in the piston.
as it was removed, or in accordance with the marking made, and then introduce the
gudgeon pin through the piston, connecting rod and piston bosses.
It is vitally important to correctly locate the gudgeon pin circlip, and a little extra care
and time should be devoted to this most simple and important operation.
nosed pliers to introduce the circlip into its groove, using a rotary motion then verify
that the circlip Is correctly located.
Illustration 4
Application of
valve spring compressor
1
COLLET, FOR VALVE.
2
COLLAR, FOR VALVE SPRING.
3
COLLAR, FOR VALVE SPRING.
4
BOLT THROUGH TOOLS A N D COILS OF
VALVE SPRING.
WWW.PlanDeGraissage.ORG
Raise the cylinder sufficiently to enable the rag to be
Place the piston over the connecting rod in the same way
5
VALVE SPRING COMPRESSOR T O O L .
OIL PASSAGE FROM ROCKER B O X TO
6
INLET VALVE GUIDE.
7
SCREW
OIL FEED TO INLET VALVE.
18
18
Use round-
W I T H
LOCK
N U T ADJUSTING
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