MG Magnette KA Instruction Manual page 50

After the cylinder head has been removed the combustion chamber side
presents the view seen in lllustration No. 30.
Each valve is numbered in relation
t o the number on the face o f the cylinder head, and valve grinding can be effected
either by holding the valve in a suitable clamp from above, o r by means o f the screw-
driver from the combustion chamber side.
It
is as well t o study this illustration
from another point, namely the possible necessity of changing a valve spring. In
a case o f emergency a rod can be inserted through the sparking plug hole, after the
sparking plug has been removed, which w i l l prevent a valve dropping into the
cylinder, but should a spring break
it
is preferable t o remove the head i n order
t o change the spring. As has been previously stated, there are 18 cylinder head
studs, and lllustration No. 30 shows the holes through which the studs pass. The
remaining holes in the head are for the free travel o f water from the cylinder body
through the gasket t o the cylinder head. The right-hand side illustration shows
the coupling attached t o the pinion shaft which operates the overhead gears.
lllustration
32.-Plan view of the cylinder head, showing the camshaft and rockers in position.
A plan view o f the cylinder block after the head has been removed, lllustration
No. 31, is worthy o f careful consideration.
I t shows the cylinder head studs in
position and the cylinder head gasket resting alongside.
Before an attempt is made
t o replace a gasket,
it
should be carefully noted that there is only one way in which
the gasket must be fitted. There is in the first place a slot at one end, while there
are holes at the other end for the passage o f water, and the shape o f the gasket must
conform t o the contour o f the combustion chamber. This illustration affords an
opportunity of noticing notches made in the gasket which afford a method o f inserting
a screwdriver o r similar tool between the head and the cylinder block, i n order t o
break the joint, which may have become very tight due t o the presence of carbon
and jointing compound.
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