Perkins 4.99 - Oil Pump Dismantling and Inspection

2
L4
1. Relief Valve Housing
2. Rotor Housing
3. Hole for Locating Screw
4. Pump Drive Gear
4. Tap back the tab washer locking the location
screw and support the lubricating oil pump assem-
bly
(if the engine is the normal way up), whilst
the location screw is removed.
5. Remove the lubricating oil pump assembly from
the cylinder block as shown in Fig. L.2.
To the Oil
1. Remove the delivery and suction pipes. The pump
will now be as shown in Fig. LA.
2. Withdraw the drive gear by means of a suitable
puller.
3. With the pump suitably held in a vice, (using
protective clamps) remove the four securing set-
screws
and remove the end cover assembly.
N.B. This end
cover assembly also incorporates the
pressure
relief valve housing.
4. Withdraw the drive shaft complete with inner rotor.
N.B. It is advisable
not to remove this inner rotor
from the shaft as this item is not available as a
separate
part (See later note) ..
5. Withdraw the outer rotor.
Inspection
1. Inspect for signs of wear, cracks, pitting, etc.
LUBRICATION SYSTEM-L.3
L5
2. Install the drive shaft complete with inner rotor,
then
the outer (driven) rotor ensuring that the face
which carries the chamfered edge enters the pump
body first (Refer Fig. L.5), now carry out the three
following dimensional checks.
L6
(a) Check the clearance between the inner and
outer rotors. (Refer Fig. L.6).
(b) Check the clearance between the outer rotor
and the pump body (Refer Fig. L.7).
(c) Check the clearance between the rotors and
the end cover assembly using a straight edge
and feeler gauges (Refer Fig. L.8).