Lube Oil Pump Disassembly And Reassembly - Yanmar 3JH4E Service Manual

8. Lubrication system
8.2.3 Lube oil pump disassembly and
reassembly
Disassembly
(1) Remove the crankshaft pulley.
(2) Remove the gear case from the gear
case flange.
(3) Remove the lube oil pump.
3JH4E and 4JH4E
Remove the pump cover from the gear case.
Do not disassemble the inner/outer rotors, and
check that the pump rotates smoothly.
4JH-TE and 4JH4-HTE
Remove the lube oil pump assembly from the
gear case flange. Do not disassemble the
inner/outer rotors, and check that the pump
rotates smoothly.
(4) The plug of the oil pressure control valve
is coated with adhesive and screwed in,
so it cannot be disassembled. These
parts cannot
disassembly. Replace it as an assembly
if necessary.
Reassembly
[NOTICE]
Always check if the pump rotates smoothly after
installation on the gear case.
Running the engine when the pump rotation is
heavy may cause the pump to be burnt.
(1) Apply lube oil to rotor (outer/inner) insertion
part.
(2) Mount the lube oil pump.
3JH4E and 4JH4E
Assemble the outer rotor so that the mark of
the end face may come to a cover side when
inserting it in the gear case.
4JH4-TE and 4JH4-HTE
Mount the lube oil pump assembly to the
gear case flange.
(3) Fasten the pump cover for 3JH4E and
4JH4E by the standard torque.
Tightening torque
Nm (kgf•m)
(4) When replacing the lube oil pump, replace
the whole assy.
be reused after
6.9 ± 1.5 (0.7 ± 0.15)
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