Inspection After Disassembly

WARNING: This page is about a different car, the 2009 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

Clearance of Oil Pump Parts

Measure clearance with feeler gauge.
Clearance between outer rotor and oil pump body (position 1).
Standard: 0.114 - 0.260 mm (0.0045 - 0.0102 in)
Tip clearance between inner rotor and outer rotor (position 2).
Standard: Below 0.180 mm (0.0071 in)

Fig 1: Measuring Clearance Between Outer Rotor And Oil Pump Body
Courtesy of NISSAN MOTOR CO., U.S.A.
Measure clearance with feeler gauge and straightedge.
Side clearance between inner rotor and oil pump body (position 3).
Standard: 0.030 - 0.070 mm (0.0012 - 0.0028 in)
Side clearance between outer rotor and oil pump body (position 4).
Standard: 0.050 - 0.110 mm (0.0020 - 0.0043 in)

Fig 2: Measuring Side Clearance Between Inner And Outer Rotor And Oil Pump Body
Courtesy of NISSAN MOTOR CO., U.S.A.
Calculate the clearance between inner rotor and oil pump body as follows:

Measure the outer diameter of protruded portion of inner rotor (position A).
Measure the inner diameter of oil pump body with inside micrometer (position B).

(clearance 5) = (inner diameter of oil pump body B) - (outer diameter of inner rotor A)

Standard: 0.045 - 0.091 mm (0.0018 - 0.0036 in)

Fig 3: Measuring Outer Diameter Of Protruded Portion Of Inner Rotor

Courtesy of NISSAN MOTOR CO., U.S.A.

Regulator Valve

Visually inspect components for wear and damage.
Check oil pressure regulator valve sliding surface and valve spring.
Coat regulator valve with engine oil. Check that it falls smoothly into the valve hole by its own weight.

If damaged, replace regulator valve set or oil pump body.

Fig 4: Identifying Regulator Valve And Outer Spring

Courtesy of NISSAN MOTOR CO., U.S.A.

Regulator Valve Clearance

(Clearance 6) = D (Valve hole diameter) - E (Outer diameter of valve)

Standard: 0.040 - 0.097 mm (0.0016 - 0.0038 in)

If it exceeds the standard, replace the oil pump body.

CAUTION: Coat regulator valve with engine oil.
Check that it falls smoothly into the valve hole by its own weight.

Fig 5: Measuring Regulator Valve Clearance

Courtesy of NISSAN MOTOR CO., U.S.A.

Assembly

Assembly is in the reverse order of disassembly.

Assemble the inner rotor and outer rotor with the punched marks on the oil pump cover side.

CAUTION: Before assembly apply new engine oil to the parts as specified.

Fig 6: Identifying Groove

Courtesy of NISSAN MOTOR CO., U.S.A.