Chrysler Front Wheel Drive Cars 6-CYL 1988-1995 Repair Information

Camshaft

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REMOVAL & INSTALLATION



3.0L Engines
PREMIER AND MONACO

See Figures 1, 2 and 3

To remove the camshafts from the Premier and Monaco 3.0L engines, the cylinder heads must be removed from the engine (if the engine is still in the vehicle).

The right and left-hand camshafts are not the same and cannot be interchanged. The camshafts can be identified by the location of the lobes. On the left-hand camshaft both lobes for each cylinder are on the same side. On the right-hand camshaft the lobes for each cylinder are on opposing sides.

The camshafts are removed and installed from the rear of the cylinder heads once they have been removed from the engine.

  1. Disconnect the negative battery cable.
  2.  
  3. By following the procedures for the removal of the cylinder heads, remove the cylinder heads from the engine.
  4.  
  5. Remove the rocker arm assemblies from the cylinder heads. Note that pins in the bottom of the front and rear pedestals index the assembly to the cylinder head.
  6.  
  7. Remove the rear camshaft cover by loosening and removing the two retaining fasteners holding it to the cylinder head.
  8.  
  9. Loosen the camshaft retainer bolt and slide the retainer up and out of the groove in the camshaft. Tighten the retainer bolt to hold the retainer in place.
  10.  
  11. Slide the camshaft out the rear of the cylinder head.
  12.  
  13. Check the camshaft lobes for wear or gouging. Replace the camshaft if any wear or gouging is evident.
  14.  

To install:
  1. Lubricate the camshaft journals with Mopar Super Oil Conditioner® or the equivalent.
  2.  
  3. Install the camshaft from the rear of the cylinder head.
  4.  
  5. Slide the retainer into the groove at the front of the camshaft.
  6.  
  7. Tighten the retainer bolt to 9 ft. lbs. (12 Nm).
  8.  
  9. Check the camshaft end-play by either using a feeler gauge as follows:
    1. Push the camshaft to the front.
    2.  
    3. Insert a feeler gauge between the retainer and the camshaft. Keep checking until a feeler gauge is found which drags as it is pulled through.
    4.  
    5. The end-play must be between 0.003-0.0055 in. (0.07-0.14mm).
    6.  

  10.  
  11. Install the rear cover with a new gasket at the rear of the cylinder head. Coat the mounting bolts' threads with Loctite 271® and tighten them to 53 inch lbs. (6 Nm).
  12.  
  13. Install the cylinder heads, rocker arm assemblies and new hydraulic lifter tappets by following the cylinder head procedures found earlier in this section.
  14.  

Installation of new hydraulic tappet lifters is necessary when new camshafts are installed.

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Fig. Fig. 1: Camshaft identification-Premier and Monaco



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Fig. Fig. 2: Rear camshaft cylinder head cover location-Premier and Monaco



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Fig. Fig. 3: Camshaft retainer and retainer bolt-Premier and Monaco

  1. Install the rocker arm assemblies onto the cylinder heads. Refer to the procedures located earlier in this section.
  2.  
  3. Connect the negative battery cable.
  4.  

EXCEPT PREMIER AND MONACO

See Figures 4 through 26

To remove the camshafts from this particular engine either removal of the cylinder heads from the engine or disassembly and removal of the timing belt system from the engine is necessary. If removing the cylinder heads is the option chosen, refer to those specific procedures found earlier in this section. The following procedure will describe removal and installation of the camshafts without removing the cylinder heads.

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the timing belt and sprockets. Refer to the procedure in this section for these components.
  4.  
  5. Remove the rocker arm covers by following their procedures located earlier in this section.
  6.  
  7. Install auto lash adjuster retainers to the rocker arms.
  8.  



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Fig. Fig. 4: After the timing belt and camshaft sprocket are removed, loosen the rocker arm hold-down bolts ...



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Fig. Fig. 5: ...then pull the rocker arm cover off of the cylinder head



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Fig. Fig. 6: Remove the upper timing belt rear cover retaining bolts ...



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Fig. Fig. 7: ... and lift the rear cover off of the camshaft



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Fig. Fig. 8: The distributor drive housing, must be removed by unscrewing the mounting bolts ...



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Fig. Fig. 9: ... and simply pulling off of the end of the cylinder head



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Fig. Fig. 10: Make sure to remove the used O-ring and install a new one on the drive housing for assembly



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Fig. Fig. 11: Completely loosen the rocker arm shaft hold-down bolts (do not remove from the mounting holes)



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Fig. Fig. 12: ... it keeps the bolts from getting installed in the wrong holes



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Fig. Fig. 13: Lift the rocker arm shaft assembly off of the cylinder head (do not to lose the lash adjusters)



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Fig. Fig. 14: The entire assembly can be set aside together, then remounted on the engine in one easy step



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Fig. Fig. 15: The camshaft simply rests in its bearing races, once the rocker arm shaft assembly is removed, so ...

  1. Remove the distributor extension and discard the old O-ring. A new O-ring will be needed for installation.
  2.  
  3. Loosen the camshaft bearing cap retaining bolts but do not remove them from the bearing caps. Remove the rocker arm, rocker shafts and bearing caps as an assembly from the cylinder head.
  4.  
  5. If the rocker arm shaft assembly must be disassembled, follow this procedure:
    1. Disassemble the rocker arm assembly, checking each component for wear, scoring, or plugged oil passages.
    2.  
    3. Check the roller for correct and smooth rotation.
    4.  
    5. Inspect the inner diameter of each rocker for any scoring or enlargement. If wear is found in side the rocker, replace it with a new one and inspect the shaft for damage.
    6.  

  6.  
  7. Remove the old camshaft oil seal from the distributor extension housing or rocker arm assembly and end seal from the rocker arm assemblies.
  8.  
  9. Lift the camshaft out of the cylinder head.
  10.  

To install:


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Fig. Fig. 16: ... just lift the camshaft out of the cylinder head



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Fig. Fig. 17: Make sure to remove and discard the used rear and front camshaft seals



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Fig. Fig. 18: Cylinder head and camshaft components



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Fig. Fig. 19: The hole on the inlet shaft is the dfference between both shafts. Make sure the notches face outwards



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Fig. Fig. 20: The arrows on the bearing caps must point in the same direction as the arrow head



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Fig. Fig. 21: When installing the rocker shafts make sure the arrows point in the same direction as the arrows on the cylinder heads



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Fig. Fig. 22: Distributor drive, front oil seal and O-ring



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Fig. Fig. 23: Install the rocker shafts into the bearing cap No. 1 with the end notches positioned as illustrated



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Fig. Fig. 24: Use the tool MD998713 to install the new camshaft oil seal



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Fig. Fig. 25: Use the tool MD998306 and a hammer to install the rear camshaft end seal (plug)



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Fig. Fig. 26: Cylinder head and camshaft components

  1. Inspect the camshaft before reassembly.
  2.  

If new camshafts are being installed, new hydraulic lifters (auto lash adjusters) must also be installed.

  1. If the rocker arm assembly was previously dismantled, assemble it as follows:
    1. Before reassembly, coat the contact faces liberally with clean motor oil.
    2.  
    3. Observe the numbers on the bearing caps so that they are replaced in the correct location.
    4.  
    5. Reassemble the rocker shafts into the front bearing cap so that the notches face outward. As you continue to assemble the springs, rockers and bearing caps, remember that the arrows on the bearing caps must point in the same direction as the arrow on the head. This is particularly important if the rockers have been removed from both cylinder heads.
    6.  
    7. Remember to check the following: 1-the rocker arm shaft on the inlet side has a 0.12 in. (3mm) oil passage hole from the cylinder head. The exhaust side shaft does not have this hole. 2-Check the rocker arm mounting portion of the shafts for wear or damage. Replace with new ones if heavily damaged or worn. 3-Check the oil holes for clogging with a small wire, then clean as necessary.
    8.  
    9. Align the camshaft bearing caps with the arrows (depending on the cylinder bank) and in numerical order.
    10.  
    11. Identify the No. 1 bearing (No. 1 and No. 4 are identical).
    12.  
    13. Install the rocker shafts into bearing cap No. 1 with the end notches positioned as shown in the illustration and with the machined portion of the rocker shaft facing down.
    14.  
    15. Insert the attaching bolts to retain the assembly.
    16.  
    17. Install the rocker arms, bearing caps and springs (the springs are the same and can be used at all locations) on the rocker arm shafts.
    18.  
    19. Apply sealant at the bearing cap ends on the cylinder heads, as shown in the illustration.
    20.  

  2.  
  3. Lubricate the camshaft journals and cams with engine oil and install the camshaft onto the cylinder head.
  4.  
  5. Apply Mopar Silicone Rubber Adhesive Sealant® or the equivalent at the bearing cap ends as shown in the illustration.
  6.  
  7. Install the rocker arm shaft assembly making sure that the arrow mark on the bearing caps and the arrow mark on the cylinder head are pointing in the same direction.
  8.  

The direction of the arrow marks on the front and rear assemblies are opposite to each other.

  1. Tighten the bearing cap bolts in the following order to 85 inch lbs. (10 Nm): bearing cap No. 3, No. 2, No. 1, No. 4.
  2.  
  3. Repeat the last step but increase the tightening torque to 15 ft. lbs. (20 Nm).
  4.  
  5. Install the distributor extension adapter with a new O-ring to the front cylinder head.
  6.  
  7. To install the new oil seal, apply a light coat of engine oil to the camshaft oil seal lip, then install the oil seal using the camshaft oil seal installer tool MD998713.
  8.  
  9. To install the new end seal (plug), clean the area of the cylinder head where the new plug will be installed. Apply a light coating of Mopar Silicone Rubber Adhesive Sealant® or the equivalent to the outer diameter of the new cam plug.
  10.  
  11. Using the special tool MD998306 install the new cam plug to a depth of 0.020 in. (0.5mm) below the surface of the cylinder head.
  12.  
  13. Install the rocker arm covers to the cylinder heads.
  14.  
  15. Install the timing belt system and sprockets to the engine. Refer to the timing belt procedures located earlier in this section.
  16.  
  17. Connect the negative battery cable.
  18.  

3.3L and 3.8L Engines

See Figures 27 and 28

To remove the camshaft in these engines first the following components must be removed by referring to their procedures located in various places in this section: intake manifold, rocker arm covers, cylinder heads, timing chain case cover, timing chain, rocker arm and shaft assemblies.

  1. Remove the pushrods and tappets from the camshaft valley in the engine. Make sure to label or identify each so that each will be installed in its original position.
  2.  
  3. Unscrew the two camshaft thrust plate retaining bolts. Pull the thrust plate off of the engine.
  4.  
  5. Thread a long bolt into the front of the camshaft to help facilitate removal of the camshaft. Slowly extract the camshaft from the engine being careful not to damage the camshaft bearings by scratching them with the camshaft lobes.
  6.  



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Fig. Fig. 27: Camshaft thrust plate position-3.3L and 3.8L engines



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Fig. Fig. 28: Camshaft and sprocket assembly-3.3L and 3.8L engines

To install:
  1. Lubricate the camshaft lobes and camshaft bearing journals and insert the camshaft to within 2 in. (51mm) of its final position in the cylinder block.
  2.  

Whenever an engine has been rebuilt or a new camshaft or tappets have been installed, add one pint (0.473 liter) of Chrysler Crankcase Conditioner® or the equivalent to the engine oil to aid with the break in. The oil mixture should be left in the engine for a minimum of 500 miles (805 km) and drained at the next normal oil change.

  1. Install the camshaft thrust plate with the two bolts. Tighten the bolts to 9 ft. lbs. (12 Nm).
  2.  
  3. Rotate the crankshaft so the timing arrow is brought to the 12 o'clock position.
  4.  
  5. Situate the timing chain on the camshaft sprocket and hold the camshaft sprocket so that the timing mark is in the 6 o'clock position.
  6.  
  7. Align the dark colored links with the dot on the camshaft sprocket, place the timing chain around the crankshaft sprocket with the dark colored link lined up with the dot on the sprocket and install the camshaft sprocket onto the end of the camshaft.
  8.  
  9. Using a straightedge, check the alignment of the crankshaft and camshaft timing marks.
  10.  
  11. Install the camshaft bolt and washer. Tighten the bolt to 40 ft. lbs. (54 Nm).
  12.  
  13. Rotate the crankshaft 2 full revolutions. The timing marks should line up. If the timing marks do not line up, remove the camshaft sprocket and realign it.
  14.  
  15. Check the camshaft end-play. With a new thrust plate the specification is 0.005-0.012 in. (0.0127-0.304mm). The old thrust plate specification is 0.012 in. (0.31mm) maximum. If not within these limits install a new thrust plate. Check the end-play as follows:
    1. Push the camshaft as far in the engine as possible.
    2.  
    3. Mount a dial indicator so that the base sits on the front of the engine block and the indicator itself rests on the camshaft sprocket face. Zero the dial indicator.
    4.  
    5. Slowly and gently pry the camshaft forward as far as it will go. Do not apply an extreme amount of force to the camshaft. Read the measurement of the dial indicator.
    6.  
    7. Perform this 2 or 3 times to double check the measurement.
    8.  

  16.  
  17. Install the timing chain snubbers. Tighten the retaining screws to 9 ft. lbs. (12 Nm). Each model year of these engines may use different length bolts, therefore do not use bolts for this component from any other model year engine.
  18.  
  19. Install the timing chain cover by using the previous procedures.
  20.  
  21. Each tappet which is reused must be installed in the same position from which it was removed.
  22.  


WARNING
When the camshaft is replaced with a new one, all of the tappets must also be replaced.

  1. Install the cylinder heads, the rocker arm covers and the intake manifold by referring to their procedures in this section.
  2.  
  3. Connect the negative battery cable.
  4.  

INSPECTION



See Figure 29

This procedure is a general procedure and can be used for all camshafts in every engine covered by this information guide.

  1. Inspect the camshaft bearing journals for damage and binding. If the journals are binding, also check the cylinder head for damage. Check the cylinder head oil holes for clogging.
  2.  
  3. On the overhead camshaft engines, check the one camshaft's tooth surface of the distributor drive gear teeth of the camshaft. Replace the camshaft with a new one if abnormal wear is evident.
  4.  
  5. Check the camshaft surface for abnormal wear and damage. Replace the camshaft with a new one if defective. Measure the camshaft lobe height and replace if the different lobes vary by more than 0.020 in. (0.5mm).
  6.  



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Fig. Fig. 29: Checking the camshaft on the 3.0L in all vehicles except for the Premier and Monaco-other engines similar

 
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