Yanmar 4JH4E - Oil Pressure Control Valve Construction

8. Lubrication system
256
(4) Inner rotor and gear boss clearance for
3JH4E and 4JH4E
8.2.5 Oil pressure control valve
construction
The oil pressure control valve attached with lube
oil pump controls the oil pressure from the time the
lube oil leaves the filter and is cooled in the lube oil
cooler until just before it enters the cylinder body
main gallery.
When the pressure of lube oil entering the cylinder
body main gallery exceeds the standard, the
control valve piston opens the bypass hole and
lube oil flows back into the oil pan.
Item Part
Standard
dimension
(mm)
Standard
clearance
(mm)
Standard
clearance limit
(mm)
Inside clearance of
inner rotor
Gear boss diameter 53.05-53.15
0.3-0.5 0.6
Rotor inner diameter 53.45-53.55
Width across flat
clearance of inner rotor
Width across flat of gear boss 49.45-49.75
0.2-0.6 0.7
Width across flat of rotor 49.95-50.05
Crank gear
Width across
flat of rotor
Rotor inne
r
diameter
Inner rotor
010544-00E