BMW 3 Series E30

since 1983-1994 release

Repair and operation of the car

+ 1. Maintenance instruction
+ 2. Maintenance
- 3. Engine
   - 3.1.2. Specifications
      3.1.3. Types of the repair work performed without dismantle of the engine
      3.1.4. Order of installation of the piston of the 1st cylinder in compression step VMT
      3.1.5. Cover of a head of cylinders
      3.1.6. The soaking-up collector
      3.1.7. Final collector
      3.1.8. Cam-shaft drive chain covers (M10 engine)
      3.1.9. Chain and asterisks (M10 engine)
      3.1.10. Covers of a gear belt (M20 and M40 engines)
      3.1.11. Gear belt and asterisks of a cam-shaft (M20 and M40 engines)
      3.1.12. Forward epiploons
      3.1.13. Head of cylinders
      3.1.14. Pallet
      3.1.15. Oil pump
      3.1.16. Flywheel (drive plate)
      3.1.17. Back epiploon of the crankshaft
      3.1.18. Engine mount details
   + 3.2. Dismantle and capital repairs of the engine
   + 3.3. Engine electric equipment
+ 4. Cooling system
+ 5. Heating and ventilation
+ 6. Fuel system
+ 7. Exhaust system
+ 8. Transmissions
+ 9. Coupling
+ 10. Brake system
+ 11. Running gear
+ 12. Body
+ 13. Electric equipment
+ 14. Useful tips


3.1.15. Oil pump


M10 and M20 engines
1. Remove the pallet.
2. On the M10 engine turn off 3 bolts of fastening of the conducted gear wheel (or a nut).
3. Turn off bolts.
4. Remove the pump.
5. On the M20 engine rotation is transmitted to the pump through the intermediate shaft connected with the leading roller of the pump. For access to the roller remove a clamping plate and get a cap. Take out the leading roller and examine gear wheels. In case of wear of a gear wheel of an intermediate shaft or the bearing replace a shaft.
6. For replacement of an intermediate shaft remove the engine, gear belt and a forward cover.
M40 engine
7. Take off a gear belt, head of cylinders and a natyazhitel of a belt.
8. Turn off a crankshaft sock nave bolt (see subsection 3.1.11) of and remove an asterisk with a dividing washer (ledge on a washer has to be turned inside).
9. Turn off bolts and get the directing and stabilizing rollers (M40).
10. Get a spline (M40).
11. Remove the remote plug.
12. Turn off bolts and remove a forward cover with the pump. Pay attention to an arrangement of bolts which have different length.
13. Get a ring from a flute in a crankshaft sock. Vypressuyte an epiploon from the case.


At each dismantling of the engine the oil pump is recommended to be changed irrespective of its state.


M10 and M20 engines
1. Uncover and check a condition of teeths of gear wheels (rotors) and an oil receiver.
2. Collect the pump, ship in a vessel with oil and check its work, rotating the roller by hand. Of the outlet has to go out oil.
M40 engine
3. Unscrew screws.
4. Uncover the pump.
5. Remove an internal gear wheel of the oil pump.
6. Remove an external gear wheel of the oil pump.
7. Get gear wheels, wash out the pump and collect, without breaking orientation of gear wheels.
8. Check pump gaps between a gear wheel and the case.
9. Check gaps between gear wheels.
10. Collect the pump.
11. Get a lock ring from the reducing valve.
12. Get the plug.
13. Get a spring.
14. Get the piston.
15. Check a condition of all details.
16. Measure spring length.
17. Collect the valve.


Assembly is carried out upside-down, on the M40 engine at assembly replace an epiploon and all laying.

1. Establish new laying on a forward part of the block of cylinders.
2. Press the new valve.