Although, crankshaft service can be performed without removing the engine from the vehicle, it is far easier to work on the engine after it has been removed from the vehicle.
REMOVAL & INSTALLATION
- Remove the engine from vehicle. For more details, refer to the engine removal procedure.
- Remove the timing case cover, timing belt or chain and sprockets.
- Remove the flywheel.
- Remove the engine oil pan.
- Remove the front crankshaft seal retainer, if applicable. On 3.0L, 3.3L and 3.8L engines, the front crankshaft seal is located in the oil pump assembly.
- Remove the oil pump assembly on the 3.0L, 3.3L and 3.8L engines.
- On 2.5L engines, remove the balance shaft carrier assembly.
- Remove the rear crankshaft oil seal retainer bolts and remove retainer.
Before removing the crankshaft, check the crankshaft end-play as follows:
- Position a small prybar between a main bearing cap and crankshaft. Move the crankshaft all the way to the rear of its travel.
- Position a feeler gauge between the thrust bearing and crankshaft machined surface to determine end-play. Refer to the crankshaft and connecting rod specification chart.
- Use the following procedure if only crankshaft removal is necessary. If other engine repairs are being performed, complete engine disassembly will be required.
- Number all connecting rod caps (if not already labeled) to aid during assembly. Remove the connecting rod bearing caps nuts and remove caps.
- Use 2 pieces of rubber tubing to cover the rod bolts to prevent crankshaft scoring.
- Tap the piston assembly lightly away from crankshaft. Care should be taken not to damage the connecting rod journals or the threads on the rod cap bolts.
- Remove the main bearing cap bolts and remove caps. Remove crankshaft.
- Install the main bearing shells with the lubrication groove in the cylinder block. Make certain the oil holes are in alignment, and bearing tabs seat in block.
- Install the thrust bearing into the applicable journal.
- Oil the bearings and journals with clean, new engine oil, then set the crankshaft into the engine block.
- Install the lower main bearing shells (without oil grooves) in the lower bearing caps.
Check the main or connecting bearing oil clearance as follows:
- Wipe oil from bearing shells.
- Cut a piece of Plastigage® to the same length as width of the bearing and place it in parallel with the journal.
- Install the bearing cap and tighten to specification.Do not rotate crankshaft or the Plastigage® will be smeared.
- Carefully remove the bearing cap and measure the width of the Plastigage® at the widest part using the scale printed on the Plastigage® package. Refer to the crankshaft and connecting rod specification chart for the maximum allowable oil clearance values.
- Install all main bearing caps with arrows toward the timing chain end of cylinder block.
- Dip the bolts in fresh, clean engine oil and install the bolts finger-tight. Alternately tighten each bolt to the figure listed in the torque specification chart in this section.
- Position the connecting rods with new bearing shells against crankshaft. Install lower caps.
- Before installing the nuts oil the threads. Install the nut on each bolt finger-tight, then alternately tighten each nut to specification. Refer to the torque specification chart later in this section for the proper torque values.
- On 2.5L engine, install balance shaft carrier assembly.
- Install the front and rear crankshaft oil seal retainer assembly. Apply a 1 / 16 in. (1.5mm) diameter bead of RTV gasket material to the retainers' sealing surfaces.
- Install the timing sprockets, timing belt/chain and timing case cover. Refer to the applicable procedures earlier in this section.
- Install the engine oil pan. Refer to Oil Pan Installation procedures.
- Install the flywheel. Refer to the torque specifications chart at the end of this section.
CLEANING & INSPECTION
- Inspect the main and connecting rod bearings replace if necessary.
- Clean the crankshaft oil passages. Check the crankshaft main journals and connecting rod journals for wear or damage.