A.J.S. 8, 14, Инструкция, Страница: 14 / 60

ENGINE OIL PUMP
(see Illustration 1)
If, for any reason, the crankcase is dismantled the oil pump plunger must be removed from
its housing before attempting to separate the crankcase halves. It is also necessary to remove
the small timing pinion.
IMPORTANT
Under no circumstances must either the pump plunger or guide screw be disturbed
in ordinary routine maintenance.
ENGINE OIL CIRCULATION
The oil pump forces oil through:—
(a) Passages drilled through the timing side flywheel axle, timing side flywheel and crank
pin to lubricate the timing side bearing and the big-end bearing. The splash passes
to interior of cylinder, to lubricate the cylinder and piston, and then falls into the
crankcase sump.
(b) From the front oil pump housing to the rocker box via passages in the cylinder
barrel, lubricating the rocker gear and valve stems. Oil from the rocker gear drains
by gravity via the push rod tunnels to the timing gear case at a pre-determined level.
The over-spill drains into the crankcase sump.
(c) The oil pump extracts oil from the crankcase sump, metal impurities are collected
by a magnetic filter incorporated in the sump drain plug. The oil is again filtered by
a felt filter located in the crankcase (see illustration 1), before returning to the
oil tank reservoir.
For valve guide lubrication see paragraph "Adjustment of oil feed".
THE OIL RESERVOIR
The normal oil level is 1 inch below the filler cap orifice, the oil content is 2½ pints.
Run the engine for a short period to scavenge the sump, before "topping up".
After the first 500 miles (800 kilometres) again at 1,000 miles (1,600 kilometres) and
subsequently at 5,000 mile intervals (8,000 kilometres) the oil reservoir should be drained
the oil filter cleaned in petrol and the reservoir replenished with new oil. It is preferable
to drain the oil after a run and when the oil is warm. A drain plug is fitted to both the
crankcase sump also the oil reservoir. The drain plug for the reservoir is close to the
bottom front crankcase bolt.
THE CRANKCASE FILTER
The filter is cylindrical in shape made from a close-grained felt, supported by a wire cage.
The filter is housed in the drive-side crankcase. (See illustration 1).
TO REMOVE THE FILTER
Use Allen Key 018667 to unscrew the domed nut and take out the spring. Remove the
cap washer, withdraw the filter with care to avoid damage. Thoroughly clean filter in
petrol and replace when dry.
TO REMOVE MAGNETIC FILTER
Incorporated with the crankcase sump plug is a powerful magnet, which does not require
frequent attention. For cleaning place a tray under the crankcase, unscrew the sump
plug, with the use of a good fitting ring spanner.
Metal particles adhering to the magnet can be removed by wiping with a grease coated
rag, the grease will collect metal particles on the rag. Keep the magnet away from
large pieces of steel or iron, as contact can impair the efficiency of the magnet.
ADJUSTMENT OF OIL FEED
The internal flow of oil is controlled by fixed restrictions, with the exception of the oil
feed to the inlet valve guide, which is regulated by a needle pointed screw located in the
cylinder head (see illustration 3) and secured by a locknut.
To adjust the oil feed loosen the lock nut and screw home lightly the regulating screw,
then unscrew it the smallest amount possible and retighten the lock nut.
An excess of oil to the inlet valve guide will cause a smoky exhaust and heavy oil con-
sumption.
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