Crankshaft: Service and Repair
CRANKSHAFTREMOVAL
NOTE: To remove the crankshaft from the engine, the engine must be removed from the vehicle.
1. Remove the engine.
2. Remove the engine oil pump.
CAUTION: DO NOT pry on the oil pan gasket when removing the oil pan, The oil pan gasket is mounted to the cylinder block in three locations and will remain attached to block when removing oil pan. Gasket can not be removed with oil pan.
3. Remove the bedplate mounting bolts. Note the location of the two stud bolts for installation.
4. Remove the connecting rods from the crankshaft.
CAUTION: The bedplate to cylinder block mating surface is a critical sealing surface. Do not pry on or damage this surface in anyway.
NOTE: The bedplate contains the lower main bearing halves. Use care when handling bedplate as not to drop or damage bearing halves. Installing main bearing halves in the wrong position will cause severe damage to the crankshaft.
NOTE: The bedplate has pry points cast into it. Use these points only. The pry points are shown below.
5. Carefully pry on the pry points (Fig. 41) to loosen the bedplate then remove the bedplate.
CAUTION: When removing the crankshaft, use care not to damage bearing surfaces on the crankshaft.
6. Remove the crankshaft.
7. Remove the crankshaft tone wheel.
INSPECTION
NOTE: Thoroughly inspect the connecting rod bearing bores and main bearing bores for scoring, blueing or severe scratches. Further disassembly may be required.
If connecting rod bearing bores show damage, the cylinder heads must be removed to service the piston and rod assemblies. If the bedplate or the cylinder block main bearing bores show damage the engine must be replaced.
1. If required, remove the main bearing halves from the cylinder block and bedplate.
2. Thoroughly clean the bedplate to cylinder block sealing surfaces and main bearing bores. Remove all oil and sealant residue.
3. Inspect the bedplate main bearing bores for cracks, scoring or severe blueing. If either condition exists the engine must be replaced.
4. Inspect the crankshaft thrust washers for scoring, scratches, wear or blueing. If either condition exist replace the thrust washers.
5. Inspect the oil pan gasket/windage tray for splits, tears or cracks in the gasket sealing surfaces. Replace gasket as necessary.
INSTALLATION
CAUTION: Main bearings are select fit. Refer to Crankshaft Main Bearings for proper bearing selections.
CAUTION: When installing crankshaft, use care not to damage bearing surfaces on the crankshaft.
NOTE: Apply sealant to the tone wheel retaining screws prior to installation.
1. Lubricate upper main bearing halves with clean engine oil.
2. Install the crankshaft tone wheel. Torque the mounting screws to 15 Nm (11 ft. lbs.).
3. Position crankshaft in cylinder block.
4. Install the thrust washers (Fig. 42).
CAUTION: The bedplate to cylinder block mating surface must be coated with leopard Engine RTV sealant prior to installation. Failure to do so will cause severe oil leaks.
NOTE: Make sure that the bedplate and cylinder block sealing surfaces are clean and free of oil or other contaminants. Contaminants on the sealing surfaces may cause main bearing distortion and/or oil leaks.
5. Apply a 2.5 mm (0.100 inch) bead of Mopar Engine RTV sealant to the cylinder block-to-bedplate mating surface as shown (Fig. 43).
6. Coat the crankshaft main bearing journals with clean engine oil and position the bedplate onto the cylinder block.
NOTE: Lubricate the bedplate retaining bolts with clean engine oil prior to installation.
7. Install the bedplate retaining bolts, making sure to place the stud bolts in the correct location, Torque the bolts in the sequence shown (Fig. 44).
^ Hand tighten bolts 1D,1G and 1F until the bedplate contacts the block.
^ Tighten bolts 1A - 1J to 54 Nm (40 ft. lbs.)
^ Tighten bolts 1 - 8 to 7 Nm (5 ft. lbs.)
^ Turn bolts 1 - 8 an additional 90°.
^ Tighten bolts A - E 27 Nm ( 20 ft. lbs.).
8. Measure crankshaft end play.
9. Install the connecting rods and measure side clearance.
10. Install oil pump.
11. Install the engine.