Lube Oil Pump Inspection - Yanmar 3JH4E Service Manual

8.2.4 Lube oil pump inspection

The right figures show the examples of lube oil
pump of 3JH4E and 4JH4E.
It is the same procedure for the 4JH4-TE and
4JH4-HTE lube oil pump as well.
(1) Outside clearance of outer rotor
Insert a gap gage between an outer rotor and a
pump body, and measure the clearance.
Outside clearance
3JH4E/4JH4E
4JH4-TE/4JH4-HTE
(2) Clearance between outer rotor and inner
rotor
Insert a gap gage between an outer rotor and
an inner rotor, and measure the clearance.
3JH4E/4JH4E
4JH4-TE/4JH4-HTE
(3) Side clearance of outer rotor
When measuring a side clearance, put a right-angle
gage to the pump body, insert a gap gage and mea-
sure the clearance.
Side clearance
3JH4E/4JH4E
4JH4-TE/4JH4-HTE
mm
Standard Limit
0.12-0.21 0.30
0.09-0.16 -
mm
Standard Limit
- 0.16
- 0.16
mm
Standard Limit
0.02-0.07 0.12
0.05-0.1 0.15
Inner rotor
255
8. Lubrication system
Outer rotor
010671-00E
Outer rotor
010670-00E