Infiniti QX4 (R50). Manual — part 75
Oil Pump
COMPONENTS
NBAT0112
SAT648AB
SAT649A
DISASSEMBLY
NBAT0113
1.
Loosen bolts in numerical order and remove oil pump cover.
SAT650A
2.
Remove rotor, vane rings and vanes.
I
Inscribe a mark on back of rotor for identification of fore-
aft direction when reassembling rotor. Then remove rotor.
SAT651A
3.
While pushing on cam ring remove pivot pin.
I
Be careful not to scratch oil pump housing.
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
REPAIR FOR COMPONENT PARTS
Oil Pump
AT-297
SAT652A
4.
While holding cam ring and spring lift out cam ring spring.
I
Be careful not to damage oil pump housing.
I
Hold cam ring spring to prevent it from jumping.
SAT653A
5.
Remove cam ring and cam ring spring from oil pump housing.
SAT654A
6.
Remove pivot pin from control piston and remove control pis-
ton assembly.
SAT655A
7.
Remove oil seal from oil pump housing.
I
Be careful not to scratch oil pump housing.
SAT656A
INSPECTION
NBAT0114
Oil Pump Cover, Rotor, Vanes, Control Piston, Side
Seals, Cam Ring and Friction Ring
NBAT0114S01
I
Check for wear or damage.
REPAIR FOR COMPONENT PARTS
Oil Pump (Cont’d)
AT-298
SAT657A
SAT658A
Side Clearances
NBAT0114S02
I
Measure side clearances between end of oil pump housing
and cam ring, rotor, vanes and control piston. Measure in at
least four places along their circumferences. Maximum mea-
sured values should be within specified positions.
I
Before measurement, check that friction rings, O-ring,
control piston side seals and cam ring spring are
removed.
Standard clearance (Cam ring, rotor, vanes and control
piston):
Refer to SDS, AT-360.
I
If not within standard clearance, replace oil pump assembly
except oil pump cover assembly.
Seal Ring Clearance
NBAT0114S03
I
Measure clearance between seal ring and ring groove.
Standard clearance:
0.10 - 0.25 mm (0.0039 - 0.0098 in)
Wear limit:
0.25 mm (0.0098 in)
I
If not within wear limit, replace oil pump cover assembly.
SAT081E
ASSEMBLY
NBAT0115
1.
Drive oil seal into oil pump housing.
I
Apply ATF to outer periphery and lip surface.
SAT654A
2.
Install cam ring in oil pump housing by the following
a.
Install side seal on control piston.
I
Pay attention to its direction — Black surface goes toward
control piston.
I
Apply petroleum jelly to side seal.
b.
Install control piston on oil pump.
SAT660A
c.
Install O-ring and friction ring on cam ring.
I
Apply petroleum jelly to O-ring.
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
REPAIR FOR COMPONENT PARTS
Oil Pump (Cont’d)
AT-299
SAT661A
d.
Assemble cam ring, cam ring spring and spring seat. Install
spring by pushing it against pump housing.
SAT651A
e.
While pushing on cam ring install pivot pin.
SAT662A
3.
Install rotor, vanes and vane rings.
I
Pay attention to direction of rotor.
SAT649A
4.
Install oil pump housing and oil pump cover.
a.
Wrap masking tape around splines of oil pump cover assem-
bly to protect seal. Position oil pump cover assembly in oil
pump housing assembly, then remove masking tape.
b.
Tighten bolts in a criss-cross pattern.
SAT663A
5.
Install new seal rings carefully after packing ring grooves with
petroleum jelly. Press rings down into jelly to a close fit.
I
Seal rings come in two different diameters. Check fit care-
fully in each groove.
Small dia. seal ring:
No mark
Large dia. seal ring:
Yellow mark in area shown by arrow
I
Do not spread gap of seal ring excessively while install-
ing. It may deform ring.
REPAIR FOR COMPONENT PARTS
Oil Pump (Cont’d)
AT-300
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