Yanmar 3JH3E - 2-3 Lube oil pump disassembly; 2-4 Lube oil pump inspection

Chapter 5 Lubrication
System
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2-3
Lube
oil
pump disassembly
(1)
Remove
the
lube
oil
pump
assembly
from
the
engine plate
(2) The lube oil pump cover may be disassembled. but
do not disassemble the rotor, rotor shaft or drive gear.
The oil pressure regulating valve plug is coated with
adhesive and screwed in, so it cannot be disassem-
bled. These parts cannot be reused after disassembly.
Replace
if
necessary as
an
assembly.
2-4
Lube oil pump inspection
(1)
Clearance between outer rotor and pump body
Insert a feeler
gauge
between
the outer rotor and
pump body to measure the clearance, and replace
if
it exceeds the limit.
Outer
rotor
Feeler
gauge
mm
Standard
Wear
limit
Outer
rotor
and
pump
body
clearance
0.09~0.16
0.25
(2) Clearance between outer rotor and inner rotor
To measure clearance, insert a feeler bauge between the
top of the inner rotor tooth and the top of the outer rotor
tooth, and replace
if
·11
exceeds the
1'1m'1t.
Inner
rotor
Outer
rotor
Feeler
gauge
5-4
Inner
rotor
Outer
rotor
mm
Standard
Wear
limit
Outer rotor
and
inner rotor clearance
0.050~0.105
0.15
(3)
Clearance between pump body and inner rotor side
of
outer rotor.
Place a straight-edge against the end of the pump
body and insert a feeler gauge between the straight-
edge and the rotor to measure side clearance. Replace
the assembly
if
the clearance exceeds the limit.
Pump
body
and
inner
rotor,
outer rotor clearance
Straight
scale
Feeler
gauge
mm
Standard
Wear
limit
0.05~0.10
0.13
(4)
Clearance between rotor shaft and Side cover
Measure the rotor shaft outer diameter and the side
cover hole diameter, and replace the entire assembly
if
the clearance exceeds the limit.
Rotor shaft
and
body
clearance
Standard
0.016~0.049
mm
Wear
limit
0.25
(5)
Check for looseness of driver gear/rotor shaft fitting,
and replace the entire assembly if loose or wobbly
(6)
Push the oil pressure regulating
valve
piston from the
oil hole side, and replace the assembly if the piston
does not return due to spring breakage, etc.
(7) Make sure that the rotor shaft rotates smoothly and
easily when the drive gear is. rotated.
Turning torque less
than
1.5
kg-cm
Printed in Japan
HINSHI-H8009