Service manual
LUBRICATING
OIL
PUMP
REMOVING
THE
OIL
PUMP
Remove from the engine in the following order:
1.
Oil Pan;
2. Oil Pump Set Screw;
3. Oil Pipe Attaching Bolts; and
4.
Oil Pump
DISASSEMBLY
Disassemble
in
the following order: Oil Pipe and Gasket;
Oil Strainer and Gasket; Oil Pump Cover; Drive Gear (use a
press and suitable mandrel); Inner Rotor and
Shaft Assembly;
Outer Rotor; Relief Valve Assembly; and Oil Pump Body.
INSPECTION
1.
Visually check the disassembled
parts
and
replace
faulty parts.
Check the sliding surface
of
pump cover
with special care and replace the cover
if
the surface has
steps or excessive streaks. (Minor steps streaks may be
repaired by rubbing them with a compound on a surface
plate.)
LUBE
OIL
PUMP
PUMP
SHAFT
&
____
ROTORS
TORQUEAT
6 - 9
ft
/bs
(0.8
-
1.2
m-Kg)
2. Inspect the clearance between the
pump
body
and
the
shaft.
Measure the clearance with a dial gauge and mag-
net base. When the clearance exceeds the limit, replace
the pump drive shaft inner rotor, pump body and drive
gear.
Clearance
Limit
0.0024
in
-
0.0079
in
(0.06
-
0.15
mm)
GAUGE
3.
Inspect the clearance between the inner rotor
and
the
outer rotor.
Check the clearance between the lobes
of
the
rotors with a feeler gauge.
If
the clearance exceeds the
limit, replace
both rotors.
OUTER
ROTOR
INNER
ROTOR
~~~~'17~TALLY
MARKS
Clearance
Limit
0.055
-
0.0100
in
(0.14
-
0.25
mm)
4. Inspect the clearance between the outer rotor
and
the
pump
body. Check the clearance between the outer rotor
and pump body with a feeler gauge.
If
the clearance
exceeds the limit, replace the rotor or pump body. .
OUTER
Clearance
Limit
0.055
-
0.0100
in
(0.14
-
0.25
mm)
5. Check the clearance between the rotor
and
the
pump
cover. Inspect the end float
of
the rotors. Place a straight-
edge across the pump body and measure the clearance
between the rotor and straight edge with a feeler gauge.
If
the clearance exceeds the limit, replace the drive gear,
drive shaft, inner rotor, outer rotor and pump body.
Clearance
Limit
PUMP
BODY
Engines & Generators
42