Oil pump, remove, check , install, s14

# Oil pump, remove, check and install, S14

Remove splash shield from below front of engine.
Drain engine oil, pull out oil dipstick.
Remove the eighteen 10mm pan bolts |
Remove the 17mm nut securing gear to oil pump, slide gear off shaft and remove. |
Unscrew the two 13mm bolts retaining the oil pump to the cylinder block. |
Remove oil pump and any shims located between pump and block.

### Check and service

Turn drive shaft to check whether pump spins freely.
Clean pick up screen
Dismantle pump, check for scoring of body or wear on rotors. |
Dismantle and check relief valve located in the main bore, this regulates engine oil pressure. Check to see if piston moves easily, check length of spring, it should be 68mm (2.677").
Check the 8 bar (114 psi) overload valve located in the bottom of the pump. Remove the circlip, washer, spring and piston. Check piston for fit and free movement. Check spring length, should be 44 ± 0.4mm (1.732 ± 0.016").
Install piston, spring, washer and circlip. Press assembly into pump by using a socket to spread the load, install circlip into slot.

### Installation

Replace O ring on vacuum line, where it meets the pump housing.
Check position of shim(s) between pump and cylinder block for correct orientation
Tighten chain by increasing or decreasing base shim size until chain has approximately 2mm of movement at the center point between the two gears, with light finger pressure.
Tighten everything to correct torque.

E30 M3 Repair Manual V2.7. Copyright ©1999-2001 Koala Motorsport & Brett Anderson