Chrysler Caravan/Voyager/Town n Country 1984-1995

Crankshaft and Main Bearings

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Fig. Fig. 1: Remove the upper main bearing insert, using a roll out pin



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Fig. Fig. 2: Home made roll out pin



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Fig. Fig. 3: Installing the crankshaft mono-block main bearing. Tighten the bolts in the sequence shown-3.0L engines

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



  1. Remove the engine from vehicle. For more details, refer to the engine removal procedure.
  2.  
  3. Remove the timing case cover, timing belt or chain and sprockets.
  4.  
  5. Remove the flywheel.
  6.  
  7. Remove the engine oil pan.
  8.  
  9. 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.
  10.  
  11. Remove the oil pump assembly on the 3.0L, 3.3L and 3.8L engines.
  12.  
  13. On 2.5L engines, remove the balance shaft carrier assembly.
  14.  
  15. Remove the rear crankshaft oil seal retainer bolts and remove retainer.
  16.  
  17. Before removing the crankshaft, check the crankshaft end-play as follows:
    1. Position a small prybar between a main bearing cap and crankshaft. Move the crankshaft all the way to the rear of its travel.
    2.  
    3. 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.
    4.  

  18.  
  19. Use the following procedure if only crankshaft removal is necessary. If other engine repairs are being performed, complete engine disassembly will be required.
  20.  
  21. Number all connecting rod caps (if not already labeled) to aid during assembly. Remove the connecting rod bearing caps nuts and remove caps.
  22.  
  23. Use 2 pieces of rubber tubing to cover the rod bolts to prevent crankshaft scoring.
  24.  
  25. 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.
  26.  
  27. Remove the main bearing cap bolts and remove caps. Remove crankshaft.
  28.  

To install:
  1. 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.
  2.  
  3. Install the thrust bearing into the applicable journal.
  4.  
  5. Oil the bearings and journals with clean, new engine oil, then set the crankshaft into the engine block.
  6.  
  7. Install the lower main bearing shells (without oil grooves) in the lower bearing caps.
  8.  
  9. Check the main or connecting bearing oil clearance as follows:
    1. Wipe oil from bearing shells.
    2.  
    3. Cut a piece of Plastigage® to the same length as width of the bearing and place it in parallel with the journal.
    4.  
    5. Install the bearing cap and tighten to specification.Do not rotate crankshaft or the Plastigage® will be smeared.
    6.  
    7. 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.
    8.  

  10.  
  11. Install all main bearing caps with arrows toward the timing chain end of cylinder block.
  12.  
  13. 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.
  14.  
  15. Position the connecting rods with new bearing shells against crankshaft. Install lower caps.
  16.  
  17. 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.
  18.  
  19. On 2.5L engine, install balance shaft carrier assembly.
  20.  
  21. 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.
  22.  
  23. Install the timing sprockets, timing belt/chain and timing case cover. Refer to the applicable procedures earlier in this section.
  24.  
  25. Install the engine oil pan. Refer to Oil Pan Installation procedures.
  26.  
  27. Install the flywheel. Refer to the torque specifications chart at the end of this section.
  28.  

CLEANING & INSPECTION



  1. Inspect the main and connecting rod bearings replace if necessary.
  2.  
  3. Clean the crankshaft oil passages. Check the crankshaft main journals and connecting rod journals for wear or damage.
  4.  

 
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