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REFITTING T H E CYLINDER BARREL
Fit a new cylinder base gasket, after removing broken pieces of the old one. Use a little
jointing compound on the base of the cylinder and stick a new gasket to it, no Jointing
compound should be on the crankcase face. Set the piston ring gaps at 120°, pass the
cylinder over the four long studs and lower it gently at the same time compressing each
piston ring in turn with the fingers, until the cylinder has passed the scraper ring when
it can be lowered on to the crankcase,
NOTE—Some clean rag under the piston to fill the throat of the crankcase will safeguard
against a broken piston ring falling into the crankcase.
REFITTING T H E CYLINDER HEAD
The cylinder head gasket also acts as an oil seal for the push rod tunnels, consequently it
must be in good order if it is to be used again.
attention a new gasket is desirable,
This gasket is neither symmetrical nor reversible and it must be placed on the cylinder in
the correct way.
A study of the cylinder barrel face will show an elongated hole (where the push rods
operate).
Just behind is a tapped hole for the cylinder head bolt.
Close to the cylinder bore and to the right of the cylinder head bolt hole is a smaller
hole, which is the oil feed passage from the pump to the rocker gear.
Place the gasket on the cylinder so that the oil feed hole in the cylinder registers with
the small hole in the gasket.
Put the cylinder head in position, refit the four cylinder head sleeve nuts and the Jong;
cylinder head bolt, do not omit the five washers.
First tighten the four sleeve nuts diagonally—not one side at a time—then tighten the
long bolt, until all are firmly tightened.
If a torque spanner is available it should be set to 35 foot Ibs. for the four sleeve nuts only.
REFITTING THE ROCKER B O X
Before attempting to refit, make sure the piston is on T.D.C. of the firing stroke, with
both cam followers down,
Use a new rocker box gasket for this assembly.
projection with a small hole in it. There is also a similar size hole in the cylinder head
which is the oil feed passage from the oil pump through the cylinder to the rocker gear,
It will be readily seen that if the rocker box gasket is reversed the oil feed passage will be
sealed, therefore ensure that the gasket is properly located before fitting the rocker box,
With the rocker box gasket correctly located, take up the rocker box, pass all the holding
down bolts through it, put the rocker box into position.
Take up the two engine push rods, tilt the right side of the rocker box upwards, then
introduce the push rods through the head and cylinder. The exhaust push rod operates
with the cam follower nearest to the contact breaker.
Locate the rocker arms in the push rod adjusters and first tighten the two central rocker
box bolts which have screwed extensions.
Tighten the remainder diagonally including the one inside the rocker box.
Washers are fitted under the heads of all these bolts.
It should be remembered that a soft gasket is used between the cylinder head and the
rocker box, therefore the degree of tightness for these bolts is a matter of good judgment
and common sense.
Re-adjust the tappets as previously described.
I G N I T I O N T I M I N G
Before setting or checking the Ignition timing, make sure the contact gap at full separa-
tion, is ·012".
(See details on Contact Breaker).
Reference to illustration 5 will indicate the principle used.
WWW.PlanDeGraissage.ORG
To avoid the possibility of subsequent
In the centre portion of this gasket is a
(See illustration 1).
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