 DISASSEMBLY
1.Remove engine assembly from vehicle. Refer to Exploded View (GT-R certified NISSAN dealer).
2.Remove oil pan (lower) and oil strainer. Refer to Exploded View (GT-R certified NISSAN dealer).
3.Remove front timing chain case, timing chain (primary) and oil pump drive chain. Refer to Exploded View (GT-R certified NISSAN dealer).
4.Remove oil pump assembly.
5.Remove suction pipe.
6.Remove rear cover.
7.Remove scavenging pump inner rotor and scavenging pump outer rotor from scavenging pump rear side.NOTE: As a reference for the assembling direction, put a mark on each rotor with paint.
8.Remove oil pump cover.
9.Remove shaft with oil pump inner rotor from oil pump housing.■ CAUTION ■ Never remove oil pump inner rotor from shaft.
10.Remove oil pump outer rotor.NOTE: As a reference for the assembling direction, put a mark on the rotor with paint.
11.After removing regulator valve plug, remove regulator valve spring and regulator valve.
 ASSEMBLY
Note the following, and assemble in the reverse order of disassembly. ■ CAUTION ■ Before assembly, apply new engine oil to the parts as instructed in the figure.- Install each rotor in the original direction, referring to the mark put before disassembly.
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