Chrysler Front Wheel Drive Cars 4-CYL 1981-1995 Repair Information

Camshaft and Bearings

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REMOVAL & INSTALLATION



2.2L (Except Turbo III) and 2.5L Except Premier Engines

See Figures 1 through 13

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Fig. Fig. 1: Once the rocker arm cover is removed the camshaft can be serviced



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Fig. Fig. 2: Remove the camshaft sprocket attaching bolt and ...



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Fig. Fig. 3: ... remove the camshaft sprocket



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Fig. Fig. 4: Loosen and remove the camshaft hold-down bolts in the proper sequence



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Fig. Fig. 5: Camshaft bearing cap identification markings-(A) direction, (B) position number



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Fig. Fig. 6: Remove the front camshaft oil seal, then ...



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Fig. Fig. 7: ... lift the camshaft off of the cylinder head



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Fig. Fig. 8: After the camshaft is removed, the rocker arms ...



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Fig. Fig. 9: ... and the hydraulic lash adjusters can be removed



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Fig. Fig. 10: Make sure to tighten the camshaft bearing caps with a torque wrench



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Fig. Fig. 11: Loosen the camshaft bearing caps in the sequence shown



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Fig. Fig. 12: Apply Mopar® Gasket Maker to the front and rear camshaft bearing caps where shown



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Fig. Fig. 13: The camshaft bearing caps are numbered and stamped with a directional arrow which should point toward the front of the engine

Since the 2.2L and 2.5L except Premier engines are designed with overhead camshafts, they are not equipped with removable camshaft bearings.

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the timing belt covers and timing belt, as described earlier in this section.
  4.  
  5. Remove the rocker arm cover. For more information, please refer to the procedure in this section.
  6.  
  7. Label or mark all valve train components (rocker arms, etc.) for reassembly.
  8.  
  9. Loosen the camshaft bearing cap nuts several turns each in the sequence shown.
  10.  
  11. Using a wooden or rubber mallet, tap the rear of the camshaft a few times to break it loose.
  12.  
  13. Remove the cap nuts and caps, being very careful that the camshaft does not cock. Cocking the camshaft could cause irreparable damage to the bearings.
  14.  

To install:
  1. Install the camshaft followers in the correct order as removed.
  2.  
  3. Lubricate the camshaft with clean engine oil, then set the camshaft onto the cylinder head.
  4.  
  5. Install the bearing caps with No. 1 at the timing belt end and No. 5 at the transaxle end. Caps are numbered and have arrows facing forward. The arrows on caps No. 1, No. 2, No. 3 and No. 4 must point toward the timing belt to prevent cap breakage. Tighten the cap nuts in the opposite order of the removal sequence. Tighten the cap nuts to 14 ft. lbs. (19 Nm).
  6.  
  7. Apply Mopar® Gasket Maker, or equivalent RTV silicone gasket material, to No. 1 and No. 5 bearing cap as shown in the accompanying illustration.
  8.  

Install the bearing caps BEFORE the seals are installed.

  1. Install the rocker arm cover, as described earlier in this section.
  2.  
  3. Install the timing belt and timing belt covers. For more information, please refer to the procedure in this section.
  4.  
  5. Connect the negative battery cable.
  6.  

2.2L Turbo III Engines

See Figures 14 through 17

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Fig. Fig. 14: Remove the rocker arm shaft hold-down = fasteners in the sequence shown



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Fig. Fig. 15: The intake camshaft utilizes a wider thrust plate than the exhaust camshaft



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Fig. Fig. 16: Use a flat-bladed prytool against a camshaft lobe to pry the camshaft from the cylinder head



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Fig. Fig. 17: Once the camshaft is started out of the engine, pull it out of the cylinder head cautiously

Since the 2.2L Turbo III engine is designed with an overhead camshaft, it is not equipped with removable bearings.

Since the camshafts must be slid out of the cylinder head, the cylinder head must be removed from the engine for this procedure.

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the cylinder head. For more information, please refer to the procedure in this section.
  4.  
  5. Label the rocker arms and shafts for reinstallation in the same positions.
  6.  
  7. Remove the rocker arms/shafts, as described earlier in this section.
  8.  
  9. Remove the thrust plates from the rear of the camshafts. The intake camshaft uses a wider thrust plate than exhaust camshaft.
  10.  


WARNING
The thrust plates are not the same thickness and cannot be interchanged.

  1. Before the camshaft can be removed from the cylinder head, the rear camshaft seal must be removed first.
  2.  
  3. Using a flat prytool, place it against the side of the camshaft lobe, then pry the camshaft out of the head. The camshaft seal will be pushed out by the camshaft.
  4.  
  5. Slide the camshaft out of the cylinder head. Be careful not to scratch the bearing surfaces in the cylinder head.
  6.  


WARNING
The intake and exhaust camshafts are not interchangeable.

  1. Remove the second camshaft in the same manner.
  2.  

To install:
  1. Lubricate the camshaft journals with clean engine oil. Carefully install the camshafts into the cylinder head.
  2.  


WARNING
The camshafts are not interchangeable. The intake camshaft has a wider thrust plate groove.

  1. Install the thrust plates and tighten the retaining nuts to 55 inch lbs. (6 Nm).
  2.  
  3. Install new camshaft oil seals flush with the cylinder head surface using Chrysler Tool C-4680.
  4.  
  5. Inspect the camshaft end-play as described in the following inspection procedures.
  6.  
  7. Install the rocker arms/shafts onto the cylinder head, then install the cylinder head onto the engine block. For more information, please refer to the procedure in this section.
  8.  
  9. Connect the negative battery cable.
  10.  

2.5L Premier Engine

The 2.5L Premier is only found in the Premier models; all other 2.5L engines are manufactured by Chrysler.

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the distributor, as described in Engine Electrical .
  4.  
  5. Remove the rocker arms, pushrods and valve lifters. For more information, please refer to the procedures in this section.
  6.  
  7. Remove the timing chain case cover, timing chain and sprockets, as described earlier in this section.
  8.  
  9. Carefully slide the camshaft out of the engine block.
  10.  

To install:

If a new camshaft is being installed, new valve lifters must also be installed.

  1. Lubricate the camshaft with Mopar® Oil Supplement, or equivalent.
  2.  
  3. Carefully slide the camshaft into the engine block without scratching the camshaft bearings.
  4.  
  5. Install the timing chain and sprockets. Install the timing chain case cover. For more information, please refer to the procedure in this section.
  6.  
  7. Install the distributor, as described in Engine Electrical .
  8.  
  9. Connect the negative battery cable.
  10.  

CAMSHAFT BEARINGS

The camshaft rotates within four steel-shelled, babbitt-lined bearings that are pressed into the cylinder block and then line reamed. The four camshaft bearing bores and bearing diameters are not the same size. They are stepped down in 0.010 in. (0.25mm) increments from the front bearing (largest) to the rear bearing (smallest). This permits easier removal and installation of the camshaft. The camshaft bearings are pressure lubricated.

The manufacturer advises that you should not attempt to replace the camshaft bearings unless special removal and installation tools are available. Follow the tool manufacturer's instructions to remove and install the bearings.

Camshaft end-play is maintained by the load placed on the camshaft by the oil pump and distributor drive gear. The helical cut of the gear holds the camshaft sprocket thrust face against the cylinder block face. Camshaft end-play is zero during engine operation.

2.6L Engine

See Figures 18, 19 and 20

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Fig. Fig. 18: Remove the water pump cover, drive belt and pulley from the rear end of the camshaft



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Fig. Fig. 19: Remove the timing chain sprocket attaching bolt, driveshaft gear and sprocket from the front end of the camshaft



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Fig. Fig. 20: Use Chrysler Tool C-4848 to drive the new oil seals into place

Since the 2.6L engine is designed with an overhead camshaft, it is not equipped with removable bearings.

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the rocker arms/shafts, as described earlier in this section.
  4.  
  5. Remove the water pump drive pulley attaching bolt, then remove the pulley itself.
  6.  
  7. Remove and discard the camshaft end bearing cap seals. Remove the seal as follows:
    1. On the back end of the camshaft, remove the water pump drive pulley cover screws, then lift the cover off of the cylinder head.
    2.  
    3. On the rear end of the camshaft, remove the water pump drive belt. Remove the water pump attaching bolt, then slide the pulley off of the end of the camshaft.
    4.  
    5. Remove the camshaft end seal with Chrysler Tool C-4847-1.
    6.  

  8.  


WARNING
Do not nick the camshaft seal surface or bore.

  1. Remove the camshaft from the cylinder head.
  2.  

To install:
  1. Lubricate the camshaft lobes and bearings, then set the camshaft onto the cylinder head.
  2.  
  3. Install the assembled rocker arm shaft assembly, as described earlier in this section.
  4.  
  5. The camshaft should be positioned so that the dowel pin on the front end of the cam is in the 12 o'clock position and in line with the notch in the top of the front bearing cap.
  6.  
  7. Install the rocker arm cover.
  8.  
  9. Install a new rear camshaft seal. Lubricate the new seal lip with clean engine oil and carefully position the seal over the camshaft and into the bore.
  10.  
  11. Tap the seal into the bore with Tool C-4848. Seal depth in the bore is correct when the tool bottoms against the camshaft.
  12.  
  13. Install the water pump pulley and tighten the retaining bolt to 40 ft. lbs. (54 Nm).
  14.  
  15. Install the water pump pulley drive belt, then install the water pump pulley cover.
  16.  
  17. Connect the negative battery cable.
  18.  

INSPECTION



Except 2.5L Premier Engines
CAMSHAFT END-PLAY CHECK

See Figure 21

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Fig. Fig. 21: Position a dial indicator with a magnetic base, as shown, to measure the end-play of the camshaft(s)-2.2L Turbo III engine shown, other engines similar

  1. Install the camshaft, thrust plates and new oil seals.
  2.  
  3. Position a dial indicator with a magnetic base as shown in the accompanying illustration to measure the end-play.
  4.  
  5. Move the camshaft as far forward as possible, then "zero'' the dial indicator.
  6.  
  7. Push the camshaft back and forth as far as possible, while watching the dial indicator for maximum end-play. Maximum end-play is shown in the Camshaft Specification chart in this section.
  8.  
  9. Remove the dial indicator and continue installing the camshaft.
  10.  

INSPECTING THE CAMSHAFT

See Figures 22 and 23

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Fig. Fig. 22: Use a micrometer to measure camshaft lobe height



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Fig. Fig. 23: To figure out the amount of camshaft lobe wear, measure the camshaft lobes at the positions shown

Measure cam lobe height at the nose or thickest point. Measure at the very edge of the lobe, where there is no wear, and at the center, where wear is at a maximum. On the 2.2 and 2.5 liter engines, 0.010 in. (0.254mm) wear is permitted, while on the 2.6, the figure is 0.020 in. (0.508mm). Replace the camshaft if it is worn excessively.

Use the above procedures as a guide for your engine. Machine shop work requires special training and equipment, it is best to send the camshaft assembly to a reputable machine shop for this kind of repair.

2.5L Premier Engine
  1. Inspect the camshaft lobes for excessive wear. Refer to the Camshaft Specifications chart for specific values when inspecting the camshaft.
  2.  
  3. Inspect the bearing journals for an uneven wear pattern or finish.
  4.  
  5. Inspect the camshaft bearings for wear.
  6.  
  7. Inspect the distributor drive gear for wear.
  8.  

 
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