Service manual

LUBRICATING OIL PUMP
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.)
/1
COVER
\- STRAINER
DRIVE GEAR, __ ~
I
\ ROTOR ASSEMBLY
LUBRICATING
OIL PUMP
2. Clearance between pump body and shaft. Measure the
above clearance with a dial gauge and magnet base.
Clearance Limit
71an1C
0.1 mm (0.0039 in)
When the clearance exceeds the limit, replace the pump drive
.". shaft'inner rotor, pump body and drive gear.
,DIAL GAUGE
\ ,i
3. Clearance between inner rotor and outer rotor. Check the
clearance between the lobes of the rotors with a feeler
gauge. If the clearance exceeds the limit, replace
both rotors.
Clearance Limit
71an1C 0.3 mm (0.012 in)
~~~"'" INNER ROTOR
o
I
~~~~!/.;f1TALLY MARKS
4. Clearance between outer rotor and 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.
Clearance Limit
0.3 mm (0.12 in)
OUTER
5. Clearance between rotor and pump cover. Check 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
0.15 mm (0.006 in).,
,STfIAIGIHT EDGE
6. Free Jength of plunger spring.
worn plunger and fatigued spring.
Spring free Limit
71 ani C 40 mm (1.61 in)
CHECKING
END FLOAT
\~
(~~i(D
1\ MEASU~ING FREE I.W '
\ LENGTH i 40 mm (1.61 in)
7. Assembly. Assemble in the reverse order of disassembly.
NOTE: When installing the rotors into the body, be sure that
the tally marks on the rotors are positioned toward the cover.
Cover Tightening Torque
71 ani C 0.8 -1.2 m-kg (5.8 - 8.7 ft-lb)
Engines & Generators
\ '38