Servicing Crankcase
Refitting the main Bearings. On all models previous to 1954 and the 1954
model ST, a bearing chipshield
is
inserted before the timing side main bearing and
a disc and circlip following the bearings.
It
will be found easier to
fit
the bearings
on all models If the crankcase is heated In the area of the bearing housing before
pressing tne bearings into position.
Timing
Cover. This cover houses a very important bush which seals the crank-
'shaft
oil
supply. If this bush
is
worn, the pressure from the oil pump will be released
directly into the timing cover, thus reducing the quantity and pressure of oil to the
big ends. The bush should always be changed when overhauling the engine.
Press
out the old bush and press
in
the new bush. Reamer in position. (New crankshaft
end diameter =0.622"
-
0.623". Bush internal diameter= 0.6235"
-
0.624").
Timing
Gears. Timing gear wear
is
negligible
;
the only part which will require
changing after considerable mileage
is
the intermediate gear bush.
To change,
push out the old bush and insert the new.
It
may be necessary to lightly reamer
the bush to suit the spindle diameter. If the timing gears
are
noisy,
it
is
futile
to
purchase an odd gear to overcome this fault. A far better plan
is
to consult your
Triumph dealer who will be able to remedy this trouble by selective assembly of
gears from his stocks.
Oil
Pump.
As previously stated under "Lubrication Maintenance", Page 25, only
the oil pump block will show signs of wear after considerable mileage. When doing
an engine overhaul, however, completely dismantle the pump by removing the two
plungers and the two body plugs when the non-return ball valves and springs will be
released. Wash the pump body and examine the bail seatings
;
if these show signs
of heavy indentation, pitting or wear to one side of the seat, they can be re-cut with
a 45' cutter or drill suitably sharpened. inspect the balls and springs and if in doubt
about their condition, new one: should be fitted. When replacing the bails, they
should be given a sharp tap onto their seatings to ensure a good
seat.
After
assembling the pump, submerge the body in oil and operate the plungers. This
will prime the pump and
at
the same time give some indication of
its
pumping ability.
Oil
Release Valve
and
Indicator. The illustration. Fig. 5, indicates the con-
struction of the valve and indicator and should be closely followed during the dis-
mantling and assembly procedure. First remove the valve cap and indicator assembly
by unscrewing from the main body when the piston valve can be withdrawn. To
remove the indicator, grip the shaft nut and unscrew the shaft from
it.
Withdraw
the shaft to release the springs and rubber seal. Carefully clean
ail
parts and ensure
that the piston valve works freely in the body. Do not tamper with the springs by
stretc'hing to increase the tension as the spring poundage
is
set to give the correct
pressure. When replacing the indicator always
fit
a new oil
seal.
Assemble in the
following manner
:
Place indicator shaft into the cap and slide the new oil
seal
over
the shaft followed by the main spring (large) and auxiliary spring (small) and finally
screw on the shaft nut. Oil the piston valve and enter into the body, position the
joint washer on the body and screw on the cap assembly.
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