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How to replace the timing chain cover gasket on a Buick skylark its leaking anti freeze

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Posted on Jan 02, 2017

ZJLimited
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SOURCE: Oil leak e36 318i BMW

From BMW 318/325/M3/525/535/M5 1989-1993 Repair Information

Timing Chain Cover REMOVAL & INSTALLATION

M30 Engine

  1. Disconnect the negative battery cable. Remove the cylinder head cover. Remove the distributor cap, rotor and rotor adapter.
  2. Drain the coolant to below the level of the thermostat and remove the thermostat housing cover.
  3. Remove the mounting bolts and note the lengths and positions of the bolts. Remove the upper timing case cover.
  4. Remove the fan, vibration damper and hub. Remove the water pump pulley. The power steering pump must be removed, leaving the pump hoses connected and supporting the pump out of the way but so the hoses are not stressed.
  5. Remove the piston which tensions the timing chain, working carefully because of very high spring pressure.
  6. Detach the tdc position sender.
  7. Loosen all the oil pan bolts, and then unscrew all the bolts from the lower timing case cover, noting their lengths for reinstallation in the same positions. Carefully, use a sharp bladed tool to separate the gasket at the base of the lower timing cover. Then, remove the cover.
To install:
  1. Check the condition of the oil pan gasket; replace if necessary. To install the lower cover, first coat the joints of the oil pan and block with sealer. Put it into position on the block, using new gaskets.
  2. Install the tensioning piston with the conical end of the spring against the plug. Install all bolts; then tighten the lower front cover bolts evenly; finally, tighten the oil pan bolts evenly. Torque the timing cover M6 bolts to 6-7 ft. lbs. (8-10 Nm) and the M8 bolts to 15-17 ft. lbs. (20-24 Nm). Tighten the oil pan M6 bolts to 6.5-8.0 ft. lbs. (9-11 Nm) and the M8 bolts to 13-15 ft. lbs. (18-22 Nm).
  3. To bleed the tensioner, fill the tensioner pocket where the piston contacts the tensioner rail with oil. Loosen the plug a few threads and move the tensioner rail back and forth until oil comes out of the plug threads and resistance is felt. Tighten the plug to 21-29 ft. lbs. (30-40 Nm).
  4. Inspect the hub of the vibration damper. If the hub is scored, install the radial seal so the sealing lip is in front of or to the rear of the scored area. Lubricate the seal with oil and install it with a sealer installer.
  5. Install the pulley/damper and torque the bolt to specifications. When installing, make sure the key and keyway are properly aligned. Install the tdc transmitter and its mounting bracket.
  6. Install the power steering pump and water pump pulley. Reinstall and tension all belts.
  7. Just before installing the upper timing case cover, check the condition of that area of the head gasket. It will usually be in good condition. If it should show damage, it must be replaced.
  8. Before installing the upper cover, use sealer to seal the joint between the back of the lower timing cover and block at the top. On some vehicles, there are sealer wells which are to be filled with sealer. If these are present, fill them carefully. Install new gaskets. Check the seal at the distributor drive and replace it, if necessary.
  9. Note that the top bolt on the driver's side and the bottom bolt on the passenger's side are longer. Tighten the 2 bolts that run down into the lower timing cover first to finger tight; torque the 6 bolts, then torque the bottom bolts. Torque the timing cover M6 bolts to 6-7 ft. lbs. (8-10 Nm) and the M8 bolts to 15-17 ft. lbs. (20-24 Nm).
  10. Inspect the sealing O-rings and replace, as necessary. Make sure the bolt at the center of the rotor has its seal in place and torque to 16-17 ft. lbs. (22-24 Nm). Install the rotor and distributor cap.
  11. Install the cylinder head cover. Install the thermostat and housing with a new O-ring. Fill the cooling system with coolant and bleed.

M42 Engine
  1. Remove the ignition leads and valve cover. Remove the cam position sender on the upper cover. Drain the coolant and remove the thermostat housing. Remove the thermostat.
  2. Remove the 11 bolts holding the upper timing cover. Remove the cover carefully to avoid damaging the head gasket.
  3. Remove the radiator, fan, belts and water pump pulley. The water pump does not need to be removed to remove the lower cover.
  4. Remove the damper and the crankshaft hub.
  5. Remove the 21 bolts and remove the cover.
To install:
  1. Check the engine block dowel sleeves. Install new gaskets on the cover. Check the condition of the radial seals and replace if necessary.
  2. Install the cover and torque the M6 bolts to 6-7 ft. lbs. (8-10 Nm) and the M8 bolts to 15-17 ft. lbs. (20-24 Nm).
  3. Install the crankshaft hub and damper. Install the water pump pulley and belts. Install the fan and radiator.
  4. Place sealer at the head gasket to cover joints. Place the upper cover with new gaskets. Install 2 bolts and press the upper cover into place by wedging down against the camshaft sprocket. Torque the M6 bolts to 6-7 ft. lbs. (8-10 Nm) and the M8 bolts to 15-17 ft. lbs. (20-24 Nm).
  5. Install the valve cover and ignition leads. Install the thermostat and cover. Install the cam position sender. Fill the cooling system with coolant mixture and bleed.

M50 Engine
  1. Remove the ignition coils and valve cover. Drain the coolant and remove the thermostat housing. Remove the thermostat.
  2. Remove the 8 bolts holding the upper timing cover. Remove the cover carefully to avoid damaging the head gasket.
  3. Remove the radiator, fan, belts and water pump pulley. The water pump does not need to be removed to remove the lower cover.
  4. Remove the damper and the crankshaft hub.
  5. Remove the 13 bolts and remove the cover.
To install:
  1. Check the engine block dowel sleeves. Install new gaskets on the cover. Check the condition of the radial seals and replace if necessary.
  2. Install the cover and torque the M6 bolts to 6-7 ft. lbs. (8-10 Nm) and the M8 bolts to 15-17 ft. lbs. (20-24 Nm).
  3. Install the crankshaft hub and damper. Install the water pump pulley and belts. Install the fan and radiator.
  4. Place the upper cover with new gaskets. Torque the M6 bolts to 6-7 ft. lbs. (8-10 Nm) and the M8 bolts to 15-17 ft. lbs. (20-24 Nm).
  5. Install the valve cover and ignition coils. Install the thermostat and cover. Fill the cooling system with coolant mixture and bleed.


continue...

Posted on Aug 21, 2010

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