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


3.1.9. Chain and asterisks (M10 engine)



After installation of the piston of the 1st cylinder in VMT of a step of compression and removal of a chain rotation of the crankshaft is not allowed, otherwise serious breakages because of impact of heads of valves with the bottoms of pistons are possible.


1. Install the piston of the 1st cylinder in compression step VMT (see subsection 3.1.4).
2. Uncover a head of cylinders (see subsection 3.1.5). Make sure that yokes of valves of the 1st cylinder freely rock.
3. Remove the top cover of a chain of the drive of a cam-shaft (see subsection 3.1.8). Be convinced of combination of tags on a cam-shaft flange with inflow in the top part of a head of cylinders. Besides, opening under a pin of an asterisk of a cam-shaft has to be in the lowermost point.
4. Release 4 bolts of fastening of an asterisk of a cam-shaft, holding the central bolt of a pulley of an uspokoitel, not allowing a crankshaft provorachivaniye. On a part of cars kontrovochny washers of bolts of an asterisk which at assembly can be not established are used. In this case before an otvorachivaniye of bolts unbend ears of washers.
5. Remove the lower cover of a chain of the drive of a cam-shaft (see subsection 3.1.8).
6. Bring a chain out of gearing with an asterisk of a cam-shaft and remove a chain, an asterisk of a cam-shaft and the crankshaft (see below). If necessary slightly knock on an asterisk to shift from the place.
Check of a state
7. Check existence on the leader and the kryuchkovatost of teeths conducted asterisks. At detection of wear and damages of teeths of an asterisk replace.
8. For removal of the leading asterisk from a sock of the crankshaft it is necessary to remove a segment spline and the oil pump (see subsection 3.1.15).


Asterisk of a napressovan on "hot" therefore the stripper of maxillary type is required. The new asterisk before installation should be heated to 80 °C. Therefore, according to the recommendation of the manufacturer if it is necessary to replace a crankshaft asterisk, it is necessary to remove the crankshaft (see subsection 3.2.16) and to hand over in car service for a thermal napressovka of an asterisk.

9. Change in a set with asterisks, as a rule at each overhaul of the engine. The main signs of wear of a chain – the increased noise during the operation of the engine and formation of paths on rollers.
Natyazhitel and uspokoitel of a chain
10. Check existence of signs of wear or damages on a natyazhitel and an uspokoitel of a chain (formation of paths of wear because of contact with a chain). At detection of defects replace these details. For replacement get lock cutting washers.


For removal of a natyazhitel or an uspokoitel get these cutting washers, having taken measures to losing a washer as perhaps spruzhinivany washers at release and their hit in the engine.

11. Check freedom of movement of a ball in a natyazhitel. If the knock when stirring is absent, then a natyazhitel replace.
12. Blow a natyazhitel from the closed end face and from a crack. Air should not pass through a plunger at a purge from the closed end face and has to pass freely at a purge from a crack.


1. Establish a natyazhitel and an uspokoitel.
2. Check combination of tags statement to the place of the lower cover of a chain and a pulley of the crankshaft. After check remove these details.
3. Dress a chain at first on a crankshaft asterisk, and then on a cam-shaft asterisk, having directed on an uspokoitel and directing a natyazhitel. Dress a cam-shaft asterisk, check combination of tags.
4. Further assembly is carried out upside-down. Delay all fastenings with the set moment.