Perkins 4.99 - Fuel Pump Drive Hub and Timing Case Back Plate; Fuel Pump Drive Hub Procedures; Timing Case Back Plate Procedures

TIMING CASE AND DRIVE-J.4
J7
9. Bring crankshaft up to T.O.C. fer Nos. 1 and 4
pistons, No. 1
piston being on its compression
stroke and mark new fuel pump gear with a
scribed line to coincide with the scribed line on
the fuel pump driving hub: also stamp two dots on
the new gear to coincide with the single dot on the
idler gear.
10. When
replacing a fuel pump, it will be neces-
sary to adjust the timing gem blacklash to within
the limits prescribed on Page J.2.
To Remove the Fuel Pump Drive Hub
1. Remove the timing case front cover and fuel pump
gear.
2. Remove the low and high pressure fuel pipes from
the fuel (injection) pump.
3. Remove the fuel pump securing setscrews and
withdraw the pump.
4. Remove the
drive hub locating circlip and with-
draw the drive hub from its bearing (Refer Fig.
J.8) .
J8
J9
5. Examine the drive hub also the bearing in which
it runs for signs of excessive wear, surface cracks
pitting etc. '
NOTE: The
bearing is an interference fit in the
cylinder block and replacement is carried out by
means
of a suitable dolly and puller or press if the
block is completely stripped. the new one being
fitted in the reverse manner.
The earlier bronze service bearing had a 0.010 in
(0,25 mm) allowance for machining in situ. The
current steel bearing is fitted with 2 pre-finished
wrapped bushes.
To Refit the Fuel Pump Drive Hub
1. Replace the drive hub in the bearing and locate
with the circlip as shown in Fig. J.9.
2. Check the drive hub end float by means of feeler
gauges placed between the front face of the
bearing and the rear face of the drive hub. The end
float limits are given on Page B.9.
3. Refit the fuel pump as detailed on Page N.6.
4. Refit the low and high pressure fuel pipes to the
fuel pump.
5. Refit the fuel pump drive gear, idler gear and hub,
timing case front cover etc.
To Remove the Timing Case Back Plate
1. Remove the timing case front cover and timing
gears.
2. Remove the fuel pump and drive hub.
3. Remove the securing setscrews and studs (where
fitted) .
4.
Lift the timing case back plate clear from the cam-
shaft and crankshaft gear.
NOTE: The
crankshaft gear is an interferance fit
on the crankshaft. Should its removal become
necessary, then this can be accomplished by the
use
of a suitable puller.
To Refit the Timing Case Back Plate
1. Fit the timing case back plate to the cylinder block
using a new joint and suitable jointing compound.
2. Refit any studs removed and secure with the set-
screws.
3. Refit the fuel pump drive hub and fuel pump.
4.
Refit the timing gears, timing case front cover etc.