A.J.S. 3.46 H.P., Руководство пользователя

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The cylinder head can then be lifted up and off. There is no Spigot or washer on
the Cylinder Barrel, hut the Head must he lifted high enough to clear the two Cylinder Head
studs. If the Cylinder Barrel is removed do not prise this from (he Crank-case but place
the palms of the hands round the finning and rock the Cylinder from side to side and when
it starts to leave the crank-case lift upwards. Do not let the connecting rod fall heavily
against the mouth of the Crank-case or the crank-case face will be damaged. When removing
the Piston, only withdraw one Gudgeon Pin Circlip with the special pliers provided and then
either push the Gudgeon Pin out from the opposite side or insert a screw-driver inside the
Gudgeon Pin and bear the screw-driver to one side and turn the Pin slowly out of the Piston
Bosses. The Gudgeon Pin is a sliding fit in the Piston and Small End. When the Piston is
removed either remember the correct original position indicated by the remaining Circlip,
or take a sharp instrument and make a mark on the inside of the piston to indicate front and
back ; be sure to replace the Piston in its original position,
For the removal of the Valves we list a special tool costing 5s. 9d. Part No. XB3340;
and for Valve Grinding a Small Tool costing 1s. 6d. Part No. XB.3360.
The accompanying illustration shows the method of operation of both the valve
extractor and the valve grinding tool; although the Cylinder Head shown does not of course
belong to a Camshaft Model the operation is similar. For portability the valve extractor is
made to fold. Be careful to see that the portion of the toot which depresses the valve spring
collar is central before compressing the spring, otherwise it is almost impossible to remove the
split cones. An important factor to watch when replacing the valve springs is that the
collars are replaced underneath the valve springs. Whilst the cylinder head is dismantled
remove the oil feed nipples to the valve guides to ascertain that these are clear; the inlet
nipple, it will be noticed, is purposely restricted with a disc, so be careful to see that these
nipples are replaced correctly.
Re-assembling— After replacing the Piston, rotate the piston rings in, their grooves
until the respective gaps are at equal distances round the piston, and make sure that the
crankcase washer is still unbroken, otherwise replace. Lead the piston into the cylinder
by holding the piston as far round as possible with the thumb and first finger, at the same
time closing in the rings round the piston. The Cylinder barrel has a chamfer lead-in for
the rings to enter. When the cylinder is again on the crankcase tighten the cylinder nuts
down evenly, not independently.
VALVE EXTRACTOR.
—7—
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