Friday, June 10, 2011

Timing Belt, Cover, Sprockets, Seal on bmw 330ci

Maintenance Intervals

Unlike most BMW engines, the M20 engine uses a timing belt. The distributor guard plate is actually the upper timing belt cover.

Timing belt maintenance is extremely important! M20 engines utilize an interference-type, non-free-wheeling engine. If the timing belt breaks, the valves in the cylinder head may strike the pistons, causing potentially serious (also time-consuming and expensive) engine damage. The normal recommended replacement interval for the timing belt is 50,00 miles (80,000 km), every 4 years.

The timing belt should be replaced on the M20 engine should be replaced as follows:

Every 4 years
Every other Service II
The first service after 50,000 miles (80,000 km)
Anytime removal is necessary to complete a repair

Removal & Installation

M20 Engine
  1. Disconnect the negative battery cable. Remove the distributor cap and rotor. Remove the inner distributor cover and seal.
  2. Remove the 2 distributor guard plate attaching bolts and one nut. Remove the rubber guard and take out the guard plate (upper timing belt cover).
  3. Rotate the crankshaft to set No. 1 piston at TDC of its compression stroke.

At TDC of No. 1 piston compression stroke, the camshaft sprocket arrow should align directly on the mark on the cylinder head.

  1. Remove the radiator.
  2. Remove the lower splash guard and take off the alternator, power steering and air conditioning belts.
  3. Remove the crankshaft pulley and vibration damper.
  4. If equipped on a 2 piece hub, hold the crankshaft hub from rotating and remove the crankshaft hub bolt.
  5. Install the hub bolt into the crankshaft about 3 turns and using a gear puller, remove the crankshaft hub.
  6. Remove the bolt from the engine side of the alternator bracket. Loosen the alternator adjusting bolt and swing the bracket out of the way.
  7. Lift out the TDC transmitter and set it aside.
  8. Remove the remaining bolt and lift off the lower timing belt protective cover.
  9. Loosen the timing belt tensioner roller bolts and push the roller in to remove the belt. Remove the intermediate shaft sprocket bolt and the sprocket.
  10. Loosen the oil pan bolts and remove the 3 front pan bolts that go into the timing cover. Use a thin blade to loosen the oil pan gasket from the cover. Remove the 6 bolts holding the cover and remove from the engine.

To install:

  1. Remove the oil pan and replace the gasket using non-hardening sealant at the joints. Replace the seals in the cover if damaged, worn or brittle. Install the timing cover using new gaskets and tighten the M6 bolts to 71-88.5 inch lbs. (8-10 Nm) and the M8 bolts to 15-17 ft. lbs. (20-24 Nm). Tighten the oil pan M6 bolts to 80-97 inch lbs. (9-11 Nm) and the M8 bolts to 13-15 ft. lbs. (18-22 Nm).
  2. Install the intermediate shaft sprocket and timing belt. Tension the belt.
  3. Install the lower timing protective cover and tighten the bolt. Install the TDC sender.
  4. Replace the alternator bracket. Install the crankshaft hub and torque the nut to 287.6-317 ft. lbs. (390-430 Nm).
  5. Install the vibration damper and pulley. Torque the bolts to 17 ft. lbs. (23 Nm).
  6. Install the upper cover and nut. Install the rubber guard. Check the condition of the O-ring and install the upper cover, then install the rotor and distributor cap.
  7. Install the accessories and belts. Install the splash shield and fill the cooling system with coolant mixture. Bleed the cooling system and connect the negative battery cable.


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