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Gary
Gary, GMC Technician
Category: GM
Satisfied Customers: 10919
Experience:  15 years gm master tech/15 years ASE master tech
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HOW TO REPLACE TIMING CHAIN FROM START TO FINISH ON A 1999 GMC SAVANA

Customer Question

HOW TO REPLACE TIMING CHAIN FROM START TO FINISH ON A 1999 GMC SAVANA
Submitted: 3 years ago.
Category: GM
Expert:  Gary replied 3 years ago.
what size engine is in the van? do you have a printer or can you save the information i send you as soon as i send it as the pictures time out quickly in here?
Customer: replied 3 years ago.
1999 GMC SAUANA 1500 4.31 YES I HAVE A PRINTER
Expert:  Gary replied 3 years ago.
before i send this.may i ask why you are changing the chain?this is a big job even the oil pan has to come off
Customer: replied 3 years ago.
BEEN CHECK OUT AND THAT IS WHAT IT NEEDS
Expert:  Gary replied 3 years ago.
ok no problem.PRINT this out or save it to your computer


  1. Remove the engine oil pan.
  2. Remove the crankshaft balancer.
  3. Remove the water pump.
  4. Disconnect the Crankshaft Position (CKP) sensor electrical connector.
  5. Remove the CKP sensor.



  1. Remove the engine front cover.

Installation Procedure

Notice: Do not reuse the engine front cover. Oil leaks may result. Do not reuse the original seal (O-ring) when installing the crankshaft position (CKP) to the engine front cover. Erratic engine operation may result.



  1. Install the engine front cover.
  2. Install the CKP sensor with a NEW seal (O-ring).



  1. Install the engine oil pan.
  2. Connect the Crankshaft Position (CKP) sensor electrical connector.
  3. Install the water pump.
  4. Install the crankshaft balancer.

  1. Disconnect the battery negative cable. Refer to Battery Cable Replacement (Battery Disconnect/Connect) in Starting and Charging.
  2. Raise the vehicle and support it with approved safety stands.



  1. Remove the oil pan drain plug and drain the engine oil into a suitable container.
  2. Remove the oil filter.
  3. Remove the oil filter adapter.



  1. Remove the bolt holding the bracket for the starter wire and the transmission cooler pipes.
  2. Remove the Crankcase Position (CKP) sensor wiring harness from the retainer.
  3. Remove the starter.



  1. Remove the transmission cover.



  1. Remove the access plugs for the oil pan rear nuts.



  1. Remove the following oil pan fasteners:
    • Remove the oil pan bolts.
    • Remove the two nuts at the crankshaft rear oil seal housing.
    • Remove the transmission to oil pan bolts.
  1. Remove the oil pan and the gasket.
  2. Clean all sealing surfaces on the engine and the oil pan.

Installation Procedure

Notice: Any time the transmission and the engine oil pan are off of the engine at the same time, install the transmission before the oil pan. This is to allow for the proper measurement of the oil pan tolerance. Failure to achieve the correct clearance can result in premature transmission failure.



  1. Install the oil pan to the engine.

Notice: Refer to Fastener Notice in Service Precautions.

  1. Install the transmission to oil pan bolts.
    • Tighten the bolts to 47 Nm (35 ft. lbs.) .



  1. Install the access plugs for the oil pan rear nuts.



  1. Install the transmission cover.
    • Tighten the transmission cover bolts to 12 Nm (106 inch lbs.) .
  1. Install the starter motor.



  1. Install the bolt holding the bracket for the starter wiring harness and the transmission cooler pipes.
    • Tighten the bracket bolt to 12 Nm (106 inch lbs.) .
  1. Install the CKP sensor wiring harness in the retainer.
  2. Install the oil filter adapter.
  3. Install the oil filter and the oil pan drain plug.
  4. Lower the vehicle.
  5. Fill the crankcase with engine oil.
  6. Connect the battery negative cable.



  1. Disconnect the battery negative cable from the battery terminal.



  1. Remove the air cleaner assembly.
  2. Drain the engine cooling system.



  1. Remove the air intake duct from the throttle body.



  1. Remove the coolant recovery reservoir.



  1. Remove the upper fan shroud.



  1. Remove the fan clutch assembly from the vehicle.



  1. Remove the drive belt from the vehicle (A/C shown).



  1. Remove the water pump pulley mounting bolts.
  2. Remove the water pump pulley from the water pump.



  1. Disconnect the lower radiator hose from the water pump.



  1. Disconnect the by-pass hose from the water pump.



  1. Remove the heater outlet hose from the water pump.
  2. Remove the water pump mounting bolts.



  1. Remove the water pump and the gasket.
  2. Clean and inspect the sealing surfaces of the engine block.
  3. Clean the water pump mounting bolts, and check the threads for damage.

Installation Procedure



  1. Install the gasket and the water coolant pump.
  2. Apply GM P/N 12346004 or equivalent thread sealant on the water pump mounting bolts.

Notice: Refer to Fastener Notice in Service Precautions.



  1. Install the water pump mounting bolts.
    • Tighten the bolts to 42 Nm (31 ft. lbs.) .



  1. Connect the heater outlet hose to the water pump.



  1. Connect the by-pass hose to the water pump.



  1. Connect the lower radiator hose to the water pump.



  1. Install the water pump pulley to the water pump.
  2. Install the water pump pulley mounting bolts.
    • Tighten the bolts to 25 Nm (18 ft. lbs.) .



  1. Install the fan clutch in the vehicle.



  1. Install the drive belt in the vehicle.



  1. Install the upper fan shroud.



  1. Install the coolant recovery reservoir.



  1. Install the air intake duct to the throttle body.
  2. Install the air cleaner assembly in the vehicle.
  3. Connect the battery negative cable to the battery terminal.

Notice: Refer to Coolant Addition Notice in Service Precautions.

  1. Refill the engine coolant system.
  2. Bleed the air from the cooling system.
  3. Inspect the system for coolant leaks.

  1. Remove the engine front cover. .
  2. Remove the crankshaft position sensor reluctor ring.



Notice: In order to rotate the engine install a bolt with the same threads as the crankshaft, but do not use the crankshaft balancer bolt or a bolt longer than 1 inch, in the crankshaft. Failing to do so will cause damage to the bolt threads and the crankshaft threaded hole when removing the bolt.

  1. Install a 7/16-20 x 1 inch bolt into the end of the crankshaft.

Notice: Align the timing marks before removing the timing chain. If it is necessary to turn either the camshaft or the crankshaft with the timing chain removed, loosen or remove the valve rocker arms. Turning either the crankshaft or camshaft with the timing chain removed may cause the pistons to contact the valves, resulting in damage.

  1. Rotate the crankshaft until:
4.1. The timing marks on both sprockets line up.
4.2. The number four cylinder is at Top Dead Center (TDC) of the compression stroke.



  1. Remove the camshaft sprocket bolts.



  1. Remove the camshaft sprocket and the camshaft timing chain.



Caution: Refer to Safety Glasses Caution in Service Precautions.

  1. Remove the crankshaft sprocket using the J 5825-A.



  1. Remove the crankshaft balancer key.
  2. Clean and inspect the timing chain and sprockets.

Installation Procedure



  1. Install the crankshaft balancer key into the crankshaft keyway. The crankshaft balancer key should be parallel to the crankshaft or with a slight incline.



  1. Align the keyway of the crankshaft sprocket with the crankshaft balancer key.

Caution: Refer to Safety Glasses Caution in Service Precautions.

  1. Use the J 5590 in order to install the crankshaft sprocket.



  1. Rotate the crankshaft until the crankshaft sprocket alignment mark is at the 12 o'clock position.

Important: Install the camshaft sprocket with the alignment mark at the 6 o'clock position.

  1. Install the camshaft sprocket and the camshaft timing chain.



  1. Look to ensure that the crankshaft sprocket is aligned at the 12 o'clock position and camshaft sprocket is aligned at the 6 o'clock position.



Notice: Refer to Fastener Notice in Service Precautions.

Important: Do not use a hammer to install the camshaft sprocket onto the camshaft. To do so may dislodge the expansion cup plug (camshaft rear bearing hole).

  1. Install camshaft sprocket bolts.
    • Tighten the camshaft sprocket bolts to 25 Nm (18 ft. lbs.) .



  1. Install the crankshaft position sensor reluctor ring.
8.1. Align the keyway on the crankshaft position sensor reluctor ring with the crankshaft balancer key in the crankshaft.
8.2. Use the in order to push the crankshaft position sensor reluctor ring onto the crankshaft until completely seated against the crankshaft sprocket.
8.3. Remove the bolt from the end of the crankshaft.
8.4. Install the engine front cover.


Gary, GMC Technician
Category: GM
Satisfied Customers: 10919
Experience: 15 years gm master tech/15 years ASE master tech
Gary and 4 other GM Specialists are ready to help you
Customer: replied 3 years ago.
GM WIENCH A FINE JOB YOU DID THANK YOU
Expert:  Gary replied 3 years ago.
any time

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Gary
Gary
GM Mechanic
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15 years gm master tech/15 years ASE master tech