The flywheel markings and timing pointer are visible when the inspection
cover on the right-hand side of the flywheel housing is removed.
The markings and their meanings are as follows:
(1) The line against which the letters T.DC. are stamped when brought
dead opposite the pointer means that No. 1, piston is on Top .Dead Centre,
i.e., at the top of its stroke.
(2) The line against which the letters F.A. are stamped when set opposite
the pointer, indicates the firing-point of No. 1 cylinder when the octane
selector is set in the standard position on the' sliding scale i.e. the
point at which the distributor points should be just opening, with the
rotor in the firing position for No. 1 or No. 4 cylinder (" 60 ")
or No. 6 cylinder (" 75 ").
(3) The line against which the letters E.P. are stamped, when set opposite
the pointer, indicates the point at which No. 1 exhaust valve should be
'at the peak Of its lift (fully open).
If the timing chain should have been removed, the procedure to re-time
the engine is as follows. (See Fig. .23).
(1) Set the tappets as instructed on Page 63.
(2) Rotate the camshaft in the running direction until No. I exhaust valve
is fully open.
The use of a dial indicator is the only reliable method of determining
this point. It should be mounted on a stud adjacent to No. 1 exhaust rocker
and with its aid the possibility of an error in determining the exhaust
peak is eliminated. It. is possible to do the job correctly without a
dial indicator, but much time is wasted, and the possibilities of an error
very much' magnified.
(3) Rotate the engine in the running direction until the E.P. mark on
the flywheel is in line with the pointer.
(4) Release the ratchet (E,F)
retaining the jockey pulley (c), pull the pulley clear of the chain path
and secure in that position with copper wire passed round the end of the
jockey pulley shaft.
(5) Fit the timing chain, ensuring that there is no slack on the driving
(6) Check the timing and correct if necessary. The camshaft, chainwheel
(A) is made with three irregularly spaced keyways, so that if the timing
will not come correct in the first position tried, alternatives are provided.
(7) Release the jockey pulley and engage it with the timing chain. Ensure
that the ratchet (E,F) is engaged.
(1) Rotate the engine until the FA mark on the flywheel is in line with
the pointer with both valves on No. I cylinder closed.
(2) The rotor of the distributor will now correspond with No. 1 cylinder
high tension lead terminal.
(3) Set the octane selector at "0" on the sliding scale.
(4) Set the distributor points just breaking by slackening the 0.25 in.
pinch bolt at the base of the distributor head and rotate the distributor
bodily in the required direction. Do not forget to, re-tighten the pinch
bolt. The correct gap for the points when fully open is .012 in. (0,30
mm.), see Page 74. (Use the combined feeler gauge and screwdriver supplied
in the tool tray).
The firing order is 1, 3, 4, 2 on "60" and 1, 5, 3, 6, 2, 4
on "75" models.
Adjustment for clearance between the rocker and valve is provided by a
set-screw and lock-nut on the rocker. (See Figs. 24 arid 25). When adjustment
is required, slacken the lock-nut and rotate the set-screw to give the
correct clearance by means of a screwdriver. The lock-nut should be securely
tightened after adjustment, great care being taken to ensure that this
operation does not upset the clearance.