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Home›Repair guides›Inspection of Oil Pump

Compatible — Inspection of Oil Pump

For these models: M8T60373 (24 V-5 kW), S4S.

Before you start

  • Install the oil pump bushing in the crankcase so that it is even with the front face of the crankcase.

Procedure

  1. Measure the clearance between the outer rotor and inner rotor. If the clearance exceeds the limit, replace the outer rotor together with the shaft assembly.
  2. Measure the end play between the rotors and pump case. If the end play exceeds the limit, replace the oil pump.
  3. Measure the clearance between the outer rotor and pump case. If the clearance exceeds the limit, replace the oil pump.
  4. Measure the diameter of the main shaft and the inside diameter of the hole in the pump case to find the clearance between the two. If the clearance exceeds the limit, replace the entire oil pump assembly.
  5. Measure the diameter of the main shaft and the inside diameter of the oil pump bushing in the crankcase to find the clearance between the two. If the clearance exceeds the limit, replace the oil pump bushing or the entire oil pump assembly.
  6. Install the oil pump bushing using the specified oil pump bushing installer.

Tools required

  • Oil pump bushing installer, Part No. 32A91-00400

Specs & torque values

  • Clearance between outer rotor and inner rotor: standard 0.13 to 0.15 mm, limit 0.20 mm
  • End play between rotors and case: standard 0.04 to 0.09 mm, limit 0.15 mm
  • Clearance between outer rotor and case: standard 0.20 to 0.30 mm, limit 0.50 mm
  • Clearance between main shaft and pump case: standard 0.032 to 0.074 mm, limit 0.150 mm (shaft diameter, case side, 15.985 to 16.000 mm)
  • Clearance between main shaft and oil pump bushing: standard 0.025 to 0.111 mm, limit 0.200 mm (shaft diameter, bushing side, 13.957 to 13.975 mm)

Source: manual:Service_SS_Series.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.