A.J.S. 16MS, Instruction Book

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The grinding is accomplished by smearing a thin layer of fine grinding paste (obtainable
ready for use at any garage) on the valve face and then, after inserting the valve in the head,
partially revolve, forwards and backwards, while applying light finger pressure to the head,
raising the valve off its seat and turning to another position after every few movements.
(Never revolve the valve continuously in one direction.)
When the abrasive ceases to bite, remove the valve and examine its face.
The grinding may be considered to be satisfactorily completed when a continuous matt
ring is observed on both valve face and seat.
After grinding, all traces of abrasive must be carefully washed off with petrol and a piece
of rag, moistened in petrol, should be pulled through the bore of each valve guide to
remove any abrasive that may have entered.
A holder for the valve, when grinding in the valve, can be supplied. The part number
is 017482.
TO REPLACE THE CYLINDER HEAD
A gasket is fitted between cylinder head and barrel. (Touring models only).
The top ends of the push rod cover tubes have rubber gaskets between tubes and head,
they are a push fit and metal washers are located between the top edges of the gaskets
and the cylinder head recesses. If the cover tubes are pulled away from the head, the
gaskets will probably remain in position in the head.
A rubber gland is fitted at the bottom of each cover tube.
Replace the cylinder head by :
Carefully clean the top edge of the cylinder barrel and the under face of the cylinder
head.
Fit the cover tubes, with their rubber gaskets and metal washers, into the cylinder
head.
Place the cylinder head gasket in position on the top edge of the cylinder barrel.
Place a rubber gland round each tappet guide
Place the cylinder head in position.
Ensure each cylinder head securing bolt has a plain steel washer on It and then replace
the bolts and engage each a few turns.
Finally, screw down the cylinder head securing bolts, in turn, bit by bit, until all are fully
home.
Replace
The sparking plug, but before doing so it is desirable to coat thread with " O i l Dag" or
graphite paste to prevent seizure upon next removal.
The rocker box, carburetter, exhaust system, and the petrol tank.
NOTE—If old gaskets are re-fitted they must be in an undamaged state otherwise new
must be used.
Whether new or re-used, the gasket should be annealed just prior to fitting. This is
done by heating to " blood red heat" and plunging into clean cold water.
TO REMOVE THE CYLINDER BARREL AND PISTON
Remove
The cylinder head.
The four nuts retaining cylinder barrel to crankcase.
Take away
Cylinder barrel. (Ensure piston is not damaged in doing this. Steady piston with hand
as barrel is withdrawn.)
Fill throat of crankcase with clean rag to prevent entry of foreign matter.
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