Chrysler Concorde/Intrepid/LHS/New Yorker/Vision 1993-1997

Crankshaft and Main Bearings

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REMOVAL & INSTALLATION



3.3L Engine

See Figures 1, 2, 3 and 4



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Fig. Fig. 1: Main crankshaft bearing cap identification-3.3L engine



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Fig. Fig. 2: Upper bearings have oil holes unlike the lower-3.3L engine



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Fig. Fig. 3: Removal and installation of the bearings with special tool C-3059-3.3L engine



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Fig. Fig. 4: Checking crankshaft end-play with a dial indicator

The crankshaft is supported in four main bearings. All upper bearing shells in the crankcase have oil grooves. All lower bearing shells installed in the monoblock main bearing cap are plain. Crankshaft end-play is controlled by thrust washers on the number three main bearing journal.

  1. Remove the engine from the vehicle and install it onto an engine stand.
  2.  
  3. Remove the upper end components (intake manifold, cylinder heads, timing belt and cover, etc.). Refer to the particular procedures in this section.
  4.  
  5. Remove the oil pan. Refer to the particular procedure in this section.
  6.  
  7. Remove the rear oil seal retainer and seal as an assembly from the engine block. Refer to the particular procedure in this section.
  8.  
  9. If the pistons and connecting rods are going to be removed from the engine, refer to those procedures located earlier in this section. If the pistons are not going to be removed from the engine, disconnect the connecting rods from the crankshaft as follows:
    1. Matchmark each connecting rod and bearing together.
    2.  
    3. Rotate the crankshaft until access is gained to the first connecting rod end bolts.
    4.  
    5. Loosen the bolts slowly, then remove the connecting rod bearing caps and set aside.
    6.  
    7. Using a wooden dowel or hammer handle, push the piston into the cylinder only until the connecting rod end is separated from the crankshaft. Be careful not to push the piston out of the cylinder, otherwise the piston will have to be reinstalled.
    8.  
    9. Rotate the crankshaft until the next connecting rod bolts are accessible. Repeat the procedure with all of the connecting rods.
    10.  

  10.  
  11. Matchmark the main bearing caps according to their positions. The caps should be numbered 1 through 4 from the front to the rear. Remove the upper half of the bearing by inserting special tool C-3059 or equivalent into the hole of the crankshaft.
  12.  
  13. Remove the bearing caps one at a time. Slowly rotate the crankshaft clockwise, forcing out the upper half of the bearing shell.
  14.  

  1. Remove the crankshaft from the engine block.
  2.  
  3. Remove the upper main bearings from the engine block journals.
  4.  

To install:
  1. Clean and inspect the crankshaft and all of the crankshaft clearances. Replace the bearings with new ones. Also check the connecting rod and cap bearings. Replace the connecting rod bearings if any abnormal wear, flaking, scratching or scoring of the bearing surfaces is evident. If the connecting rod bearing surfaces show any abnormal wear, check the connecting rod journals on the crankshaft-machining of the crankshaft may be necessary.
  2.  
  3. Install the crankshaft upper bearings into the engine block. The thrust bearings (bearings with the sides) are to be installed in bearing journal No. 2. The upper bearings have an oil groove and oil hole. When installing, make certain that the oil hole lines up with the oil hole in the engine block and that the locating notch is installed against the locating tab on the engine block journals.
  4.  
  5. Install the lower main bearings into the main bearing caps so that the locating notches line up with the locating tabs in the caps.
  6.  
  7. Wipe any residual oil from the crankshaft journals and bearing shells.
  8.  
  9. Check the bearing clearance as described in the bearing replacement in this section.
  10.  
  11. Set the crankshaft again in place.
  12.  
  13. Install the main bearing caps once again to their respective journals.Insert the bearing tool C-3059 or equivalent into the oil hole of the crankshaft.
  14.  
  15. Slowly rotate the crankshaft counter-clockwise sliding the bearing into position. Remove the special tool.
  16.  
  17. Install each main bearing cap and tighten the bolts finger tight.
  18.  
  19. Tighten No. 1, No. 3 and No. 4 main cap bolts to a total of 30 ft. lbs. (41 Nm) plus 1 / 4 of a turn (90°).
  20.  
  21. Rotate the crankshaft so that the No. 6 piston crankshaft throw is at its furthest position toward the top (cylinder head surface) of the block.
  22.  
  23. To ensure correct thrust bearing alignment the following procedure must be performed:
    1. Move the crankshaft all the way to the rear of its travel (toward the flywheel end of the engine).
    2.  
    3. Now move the crankshaft all the way to the front of its travel.
    4.  
    5. Wedge an appropriate tool (prytool) between the rear of the cylinder block and the rear crankshaft counterweight. This will hold the crankshaft in its most forward position.
    6.  
    7. Tighten the No. 2 bearing cap bolts to 30 ft. lbs. (41 Nm) plus 1 / 4 of a turn (90°) in the same fashion as the three other main caps.
    8.  

  24.  
  25. Check the crankshaft end-play as follows:
    1. Mount a dial indicator to the front of the engine, positioning the probe on the nose of the crankshaft.
    2.  
    3. Move the crankshaft all the way to the rear of its travel.
    4.  
    5. Set the dial indicator to zero.
    6.  
    7. Move the crankshaft all the way to the front of its travel and read the dial indicator. Refer to the specifications chart for the specific amount of end-play allowed. If too much end-play is exhibited, larger thrust bearings must be used.
    8.  

  26.  
  27. Another way of checking the end-play, if no dial indicator is available, is as follows:
    1. Move the crankshaft all the way to the rear of its travel using a lever (prytool) inserted between a main bearing cap and a crankshaft counterweight using care not to damage any bearing surface. Do not loosen any main bearing cap.
    2.  
    3. Use a feeler gauge between No. 2 thrust bearing and the machined crankshaft surface to determine the end-play. Insert feeler gauges until the largest one which can be inserted is found, this is the end-play. Refer to the specifications chart to find the specific end-play for the particular engine being measured.
    4.  

  28.  
  29. One-by-one, tap the pistons with a hammer handle or wooden dowel down (toward the crankshaft) until the connecting rod ends are seated on their respective journals. Before completely seating the rod ends on the crankshaft apply clean engine oil to the connecting rod and cap bearings.
  30.  
  31. If the connecting rod bearings were replaced with new ones or if the old bearings are being reused and they exhibit some wear, check the connecting rod bearings for oil clearance and side clearance. Refer to the piston and connecting rod procedures found earlier in this section.
  32.  
  33. Install the rear oil seal retainer with a new oil seal. Refer to this procedure located earlier in this section.
  34.  

  1. Install the oil pan and all other engine components which were removed, such as: intake manifold and fuel injection unit, cylinder heads, timing chain and cover, pulleys and other related components.
  2.  
  3. Install the engine into the vehicle.
  4.  

3.5L Engine

See Figures 5, 6 and 7



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Fig. Fig. 5: Main bearing identification-3.5L engine



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Fig. Fig. 6: The bearing s are to be placed into these positions-3.5L engine



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Fig. Fig. 7: Crankshaft main tie bolts No. 2 and No. 3 locations-3.5L engine

  1. Remove the engine from the vehicle and install it onto an engine stand.
  2.  
  3. Remove the upper end components (intake manifold, cylinder heads, timing belt and cover, etc.). Refer to the particular procedures in this section.
  4.  
  5. Remove the oil pan and windage tray. Refer to the particular procedure in this section.
  6.  
  7. Remove the rear oil seal retainer and seal as an assembly from the engine block. Refer to the particular procedure in this section.
  8.  
  9. If the pistons and connecting rods are going to be removed from the engine, refer to those procedures located earlier in this section. If the pistons are not going to be removed from the engine, disconnect the connecting rods from the crankshaft as follows:
    1. Matchmark each connecting rod and bearing together.
    2.  
    3. Rotate the crankshaft until access is gained to the first connecting rod end bolts.
    4.  
    5. Loosen the bolts slowly, then remove the connecting rod bearing caps and set aside.
    6.  
    7. Using a wooden dowel or hammer handle, push the piston into the cylinder only until the connecting rod end is separated from the crankshaft. Be careful not to push the piston out of the cylinder, otherwise the piston will have to be reinstalled.
    8.  
    9. Rotate the crankshaft until the next connecting rod bolts are accessible. Repeat the procedure with all of the connecting rods.
    10.  

  10.  
  11. Matchmark the main bearing caps according to their positions. The caps should be numbered 1 through 4 from the front to the rear. Remove the upper half of the bearing by inserting special tool C-3059 or equivalent into the hole of the crankshaft.
  12.  
  13. Remove the bearing caps one at a time. Slowly rotate the crankshaft clockwise, forcing out the upper half of the bearing shell.
  14.  
  15. Remove the crankshaft from the engine block.
  16.  
  17. Remove the upper main bearings from the engine block journals.
  18.  

To install:
  1. Clean and inspect the crankshaft and all of the crankshaft clearances. Replace the bearings with new ones. Also check the connecting rod and cap bearings. Replace the connecting rod bearings if any abnormal wear, flaking, scratching or scoring of the bearing surfaces is evident. If the connecting rod bearing surfaces show any abnormal wear, check the connecting rod journals on the crankshaft-machining of the crankshaft may be necessary.
  2.  
  3. Install the crankshaft upper bearings into the engine block. The thrust bearings (bearings with the sides) are to be installed in bearing journal No. 2. The upper bearings have an oil groove and oil hole. When installing, make certain that the oil hole lines up with the oil hole in the engine block and that the locating notch is installed against the locating tab on the engine block journals.
  4.  
  5. Install the lower main bearings into the main bearing caps so that the locating notches line up with the locating tabs in the caps.
  6.  
  7. Wipe any residual oil from the crankshaft journals and bearing shells.
  8.  
  9. Check the bearing clearance as described in the bearing replacement in this section.
  10.  
  11. Set the crankshaft again in place.
  12.  
  13. Install the main bearing caps once again to their respective journals.Insert the bearing tool C-3059 or equivalent into the oil hole of the crankshaft.
  14.  
  15. Slowly rotate the crankshaft counter-clockwise sliding the bearing into position. Remove the special tool.
  16.  
  17. Install each main bearing cap and tighten the bolts finger tight.
  18.  
  19. Tighten No. 1, No. 3 and No. 4 main cap bolts to a total of 30 ft. lbs. (41 Nm) plus 1 / 4 of a turn (90°). Then tighten the No. 3 tie bolts to 40 ft. lbs. (54 Nm).
  20.  
  21. Rotate the crankshaft so that the No. 6 piston crankshaft throw is at its furthest position toward the top (cylinder head surface) of the block.
  22.  
  23. To ensure correct thrust bearing alignment the following procedure must be performed:
    1. Move the crankshaft all the way to the rear of its travel (toward the flywheel end of the engine).
    2.  
    3. Now move the crankshaft all the way to the front of its travel.
    4.  
    5. Wedge an appropriate tool (prytool) between the rear of the cylinder block and the rear crankshaft counterweight. This will hold the crankshaft in its most forward position.
    6.  
    7. Tighten the No. 2 bearing cap bolts to 30 ft. lbs. (41 Nm) plus 1 / 4 of a turn (90°) in the same fashion as the three other main caps. Then tighten the No. 2 tie bolts to 40 ft. lbs. (54 Nm). Remove the holding tool.
    8.  

  24.  
  25. Check the crankshaft end-play as follows:
    1. Mount a dial indicator to the front of the engine, positioning the probe on the nose of the crankshaft.
    2.  
    3. Move the crankshaft all the way to the rear of its travel.
    4.  
    5. Set the dial indicator to zero.
    6.  
    7. Move the crankshaft all the way to the front of its travel and read the dial indicator. Refer to the specifications chart for the specific amount of end-play allowed. If too much end-play is exhibited, larger thrust bearings must be used.
    8.  

  26.  
  27. Another way of checking the end-play, if no dial indicator is available, is as follows:
    1. Move the crankshaft all the way to the rear of its travel using a lever (prytool) inserted between a main bearing cap and a crankshaft counterweight using care not to damage any bearing surface. Do not loosen any main bearing cap.
    2.  
    3. Use a feeler gauge between No. 2 thrust bearing and the machined crankshaft surface to determine the end-play. Insert feeler gauges until the largest one which can be inserted is found, this is the end-play. Refer to the specifications chart to find the specific end-play for the particular engine being measured.
    4.  

  28.  
  29. One-by-one, tap the pistons with a hammer handle or wooden dowel down (toward the crankshaft) until the connecting rod ends are seated on their respective journals. Before completely seating the rod ends on the crankshaft apply clean engine oil to the connecting rod and cap bearings.
  30.  
  31. If the connecting rod bearings were replaced with new ones or if the old bearings are being reused and they exhibit some wear, check the connecting rod bearings for oil clearance and side clearance. Refer to the piston and connecting rod procedures found earlier in this section.
  32.  
  33. Install the rear oil seal retainer with a new oil seal. Refer to this procedure located earlier in this section.
  34.  
  35. Install the oil pan and all other engine components which were removed, such as: intake manifold and fuel injection unit, cylinder heads, timing chain and cover, pulleys and other related components.
  36.  
  37. Install the engine into the vehicle.
  38.  

INSPECTION & CLEANING



Visually check the main and connecting rod bearing journals for wear, scuffing or scoring and replace the bearings with new ones if any such indicators are found.

The crankshaft journals should be checked with a micrometer for excessive wear, taper, scoring and for being out-of-round. Limits of taper or out-of-round on any crankshaft journals should be held to 0.001 inch (0.025mm). If any of these symptoms are found, have the crankshaft ground by a qualified automotive machine shop. Clean all oil passages on the crankshaft.

BEARING REPLACEMENT



See Figures 8 and 9



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Fig. Fig. 8: Measuring bearing clearance with Plastigage®



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Fig. Fig. 9: Crankshaft specifications chart-3.5L engine

If the bearings exhibit any uneven or excessive wear, scoring, flaking or scratching they must be replaced with new ones.

Bearing caps are not interchangeable and should be marked at removal to ensure correct assembly. The upper and lower bearing halves are NOT interchangeable. Lower main bearing halves of No. 1, No. 3 and No. 4 are interchangeable. The upper main bearing halves of No. 1, No. 3 and No. 4 are also interchangeable. The upper main bearings have an oil groove and oil hole. The lower bearing halves have neither of these. When installing the bearing halves, make sure the locating tangs are installed in the locating grooves of the bearings and, for the upper bearing halves, the oil holes are aligned with the oil holes in the block.

The upper and lower No. 2 bearing halves are flanged to carry the crankshaft thrust loads and are NOT interchangeable with any other bearing halves in the engine. Bearing shells are available in standard and the following undersizes: 0.001 inch (0.025mm), 0.002 inch (0.051mm), 0.003 inch (0.076mm), 0.010 inch (0.254mm, and 0.012 inch (0.305mm). Never install an undersize bearing that will reduce the oil clearance below the specifications.

  1. Set the crankshaft into the engine.
  2.  
  3. Cut pieces of Plastigage® to the same length as the width of the bearing and place a piece on each of the journals parallel with the journal axis (across the width of the bearing, not along its length).
  4.  
  5. Install the main bearing caps to their respective journals. Oil the threads on the cap bolts and finger-tighten them.
  6.  
  7. Tighten the main cap bolts to a total of 30 ft. lbs. (41 Nm) plus 1 / 4 of a turn (90°).
  8.  

Do not rotate crankshaft or the Plastigage® will be smeared.

  1. Carefully remove the bearing caps and measure the width of the various pieces of the Plastigage® at their widest parts using the scale on the Plastigage® package. If the width of the Plastigage® varies this shows the amount of taper present. If the clearances are not within specifications, either different bearing shells will be needed or the crankshaft will have to be machined by a qualified automotive machine shop.
  2.  
  3. Wipe the Plastigage® off of the crankshaft or bearing shell. Remove the crankshaft from its position in the engine.
  4.  
  5. Apply clean engine oil to the bearing surfaces of the engine block and cap and to the crankshaft journals.
  6.  

 
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