Crankshaft: Service and Repair
Crankshaft
Special tools, testers and auxiliary items required
• Guide pins (8189)
Removing
• To remove the crankshaft from the engine, the engine must be removed from the vehicle.
- Remove the engine. Refer to => [ Engine, Removing ] Engine, Removing.
- Remove the cylinder head covers, spark plugs, upper oil pan, engine timing cover, timing chain and sprockets. Refer to => [ Timing Chain And Sprockets ] Service and Repair.
- Remove the flexplate and the rear crankshaft oil seal. Refer to => [ Rear Crankshaft Oil Seal ] Rear Crankshaft Oil Seal.
- Remove the oil pump pick-up and engine oil pump. Refer to=> [ Oil Pump ] Oil Pump.
- Remove the eight main bearing cap bolts from the windage tray in the sequence shown and remove the windage tray (1).
DO NOT use a number stamp or a punch to mark connecting rods or caps, as damage to connecting rods could occur
• Connecting rods and bearing caps are not interchangeable and should be marked before removing to ensure correct reassembly.
- Mark connecting rod and bearing cap positions (1) using a permanent ink marker or scribe tool.
• Typical V6 engine configuration shown.
Care must be taken not to damage the fractured rod and cap joint face surfaces, as engine damage may occur.
- Remove the connecting rod cap bolts (5) and the connecting rod caps (4). Discard the cap bolts.
- Remove the plastic guide plates (3) from the guide pins (8189) (7) and install the guide pins (8189) to the connecting rod.
Care must be taken not to nick crankshaft journals, as engine damage may occur
- Push the connecting rod and piston into the cylinder until the connecting rod is clear of the crankshaft journal. Remove the guide pins. Repeat this procedure at each cylinder until all of the connecting rods are clear of the crankshaft.
• Typical V6 engine configuration shown.
Remove the main bearing cross bolts in the sequence shown.
DO NOT use a number stamp or a punch to mark main bearing caps, as damage to main bearings could occur.
• Main bearing caps are not interchangeable and are marked to insure correct assembly.
- Mark the main bearing cap positions using a permanent ink marker or a scribe tool.
- Remove the eight main bearing cap bolts in the sequence shown and remove the main bearing caps.
Do not rest the crankshaft on the target wheel (1). Damaged or bent target wheel teeth will destroy the target wheels ability to correctly relay crankshaft position to the crankshaft position sensor.
- Remove the crankshaft from the engine block.
- If required, remove the four bolts (2) and the target wheel (1). Discard the four bolts.
Installing
- If required, select and fit new crankshaft main bearings to the engine block. Refer to => [ Crankshaft Main Bearing Fitting ] Crankshaft Main Bearing Fitting.
- If required, select and fit new bearings to the connecting rod. Refer to => [ Connecting Rod Bearing Fitting ] Procedures
- If removed, install the target wheel (1) to the crankshaft with four new bolts (2). Ensure the threaded holes in the crankshaft are free of residual thread lock adhesive. Tighten the bolts to 10 Nm (89 in. lbs.).
• Typical V6 engine configuration shown.
- If removed, lubricate and install the upper main bearing halves (6) into the engine block (7).
When installing the crankshaft, use care not to damage bearing surfaces on the crankshaft.
- Install the crankshaft (4) into the engine block (7).
• Typical V6 engine configuration shown.
- Installing thrust washers (1) at the No. 2 main bearing location, using the following procedure:
- Move the crankshaft forward to the limit of travel. Lubricate and install the front thrust washer (1) by rolling the washer onto the machined shelf between the No. 2 upper main bulk head and crankshaft thrust surface.
- Move the crankshaft rearward to the limit of travel. Lubricate and install the rear thrust washer by rolling the washer onto the machined shelf between the No. 2 upper main bulk head and crankshaft thrust surface.
The main bearing cap bolts are tightened using a torque plus angle procedure. The bolts must be examined BEFORE reuse. If the threads are necked down the bolts must be replaced.
- Check the main bearing cap bolts for necking by holding a scale or straight edge against the threads. If all the threads do not contact the scale (2) the bolt must be replaced.
• Typical V6 engine configuration shown.
- If removed, lubricate and install the lower main bearing halves (3) onto the main caps (1).
- Install the main bearing caps (1) with two inner main bearing cap bolts (2).
- Tighten the inner main bearing cap bolts in the sequence shown to 20 Nm (15 ft. lbs.) plus 90°.
- Measure crankshaft end play. Refer to => [ Measuring Crankshaft End Play ] Testing and Inspection.
• Typical V6 engine configuration shown.
- If removed, install the bearing shell (8) on the connecting rod with the tang inserted into the machined groove in the rod. Lubricate the bearing surface with clean engine oil.
- Remove the plastic guide plates (3) from the guide pins (8189) (7) and install the guide pins (8189) to the connecting rod.
Care must be taken not to nick crankshaft journals, as engine damage may occur
- Pull the connecting rod and piston toward the crankshaft until the connecting rod is seated on the crankshaft journal. Remove the guide pins.
The connecting rod bolts must not be reused. Always replace the connecting rod bolts whenever they are loosened or removed.
- If removed, install the bearing shell (6) on the connecting rod cap (4) with the tang inserted into the machined groove in the cap. Lubricate the bearing surface with clean engine oil.
• Do not lubricate the threads of the connecting rod cap bolts (5).
- Install the connecting rod cap and bearing with the tang on the same side as the rod. Tighten the NEW connecting rod cap bolts (5) to 20 Nm (15 ft. lbs.) plus 90°.
- If required, check the connecting rod side clearance. Refer to => [ Measuring Connecting Rod Side Clearance ] Measuring Connecting Rod Side Clearance.
- Repeat the previous steps for the remaining connecting rods.
- Install the windage tray (1) with eight main bearing cap bolts. Tighten the bolts in the sequence shown to 21 Nm (16 ft. lbs.) plus 90°.
• Typical V6 engine configuration shown.
- Install the eight main bearing tie bolts. Tighten the bolts in the sequence shown to 28 Nm (21 ft. lbs.).
- Install the engine oil pump and oil pump pick-up. Refer to => [ Oil Pump ] Oil Pump.
- Install the rear crankshaft oil seal and flexplate. Refer to => [ Rear Crankshaft Oil Seal ] Rear Crankshaft Oil Seal.
- Install the timing chain and sprockets, engine timing cover, oil pans, spark plugs and cylinder head covers. Refer to => [ Timing Chain And Sprockets ] Service and Repair.
- Install the engine. Refer to => [ Engine, Installing ] Engine, Installing.
- If removed, install the oil filter and fill the engine crankcase with the proper oil to the correct level. Refer to => [ Engine Oil Level Check ] Testing and Inspection.
- Connect the negative battery cable.
- Fill the cooling system. Refer to => [ Cooling System Draining and Filling ] Cooling System Draining and Filling.
- Operate the engine until it reaches normal operating temperature. Check cooling system for correct fluid level.
• The Cam/Crank Variation Relearn procedure must be performed using the scan tool anytime there has been a repair/replacement made to a powertrain system, for example: flywheel, valvetrain, camshaft and/or crankshaft sensors or components.