Dodge Colt/Challenger/Conquest/Vista 1971-1989 Repair Guide

Rocker Arm and Shaft

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To service the rocker arms or camshaft while the cylinder head is still mounted on the cylinder block and in the car:

  1. Remove the breather hoses, purge hose and air cleaner. Disconnect the spark plug cables.
  2.  
  3. Turn the crankshaft until number 1 piston is on TDC (refer to ).
  4.  
  5. Refer to the cylinder head removal portion in this section. Locate the engine size and year of your car as listed between Steps 7 and 11. Proceed with the steps pertaining to your car and remove the cam sprocket, timing chain/belt and rocker arm cover.
  6.  

REMOVAL & INSTALLATION



Except 1985-89 1977cc and 2555cc Engines


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Fig. Fig. 1 Rocker arm identification-1468 and 1597 engines



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Fig. Fig. 2 Common valve arrangement



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Fig. Fig. 3 Exploded view of the cylinder head-1597cc engine



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Fig. Fig. 4 Cylinder head parts identification chart-1597cc engine



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Fig. Fig. 5 Loosen ...



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Fig. Fig. 6 ... then remove the shaft mounting bolts



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Fig. Fig. 7 Lift the whole shaft assembly from the engine

If the cylinder head has been removed from the car or the preceding steps have been followed:

  1. Matchmark the camshaft/rocker arm bearing caps to their cylinder head location (Except 1410cc and 1468cc engine).
  2.  
  3. Loosen the bearing cap bolts, or the rocker shaft bolts (1410cc and 1468cc engines) from the cylinder head but do not remove them from the caps or shafts. Lift the rocker assembly from the cylinder head as a unit.
  4.  
  5. The rocker arm assembly can be disassembled by the removal of the mounting bolts (and dowel pins on some models) from the bearing caps and or shafts.
  6.  

Keep the rocker arms and springs in the same order as disassembly. The left and right springs have different tension ratings and free length. Observe the location of the rocker arms as they are removed. Exhaust and intake, right and left are different. Do not get them mixed up.

  1. Observe the mating marks and reassemble the units, install the assembly in position on the cylinder head after all necessary service has been done.
  2.  

1997cc and 2555cc Engines


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Fig. Fig. 8 Exploded view of the rocker arm assembly-2555cc engine



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Fig. Fig. 9 Exploded view of the rocker arm assembly component list-2555cc engine



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Fig. Fig. 10 Camshaft timing alignment mark for No. 1 TDC-1997 engine



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Fig. Fig. 11 The use of a lash adjuster holding tool may be necessary to perform this procedure



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Fig. Fig. 12 Engine rocker arm identification-1997cc engine



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Fig. Fig. 13 Engine rocker arm shaft identification-1997cc engine



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Fig. Fig. 14 Installing the automatic lash adjuster with special tool MD998443



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Fig. Fig. 15 Engine rocker arm shaft identification-1997cc engine



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Fig. Fig. 16 Checking the automatic lash adjuster operation after installation

A special tool, MD998443, is required to retain the automatic lash adjusters in this procedure.

  1. Remove the rocker cover and gasket, and the timing belt cover.
  2.  
  3. Turn the crankshaft so that the #1 piston is at TDC compression. At this point, the timing mark on the camshaft sprocket and the timing mark on the head to the left of the sprocket will be aligned.
  4.  
  5. Remove the camshaft bearing cap bolts.
  6.  
  7. Install the automatic lash adjuster retainer tool, MD998443, to keep the adjuster from falling out of the rocker arms.
  8.  
  9. Lift off the bearing caps and rocker arm assemblies.
  10.  
  11. The rocker arms may now be removed from the shafts.
  12.  

KEEP ALL PARTS IN THE ORDER IN WHICH THEY WERE REMOVED. NONE OF THE PARTS ARE INTERCHANGEABLE.

To install:

  1. Check all parts for wear or damage. Replace any damaged or excessively worn part.
  2.  
  3. Service as required, assemble all parts. Note the following:
  4.  
    1. The rocker shafts are installed with the notches in the ends facing up.
    2.  
    3. The left rocker shaft is longer than the right.
    4.  
    5. The wave washers are installed on the left shaft.
    6.  
    7. Coat all parts with clean engine oil prior to assembly.
    8.  
    9. Insert the lash adjuster from under the rocker arm and install the special holding tool.
    10.  
    11. Tighten the bearing cap bolts, working from the center towards the ends, to 15 ft. lbs.
    12.  
    13. Check the operation of each lash adjuster by positioning the camshaft so that the rocker arm bears on the low, or round portion of the cam (pointed part of the cam faces straight down). Insert a thin steel wire, or tool MD998442 in the hole in the top of the rocker arm, over the lash adjuster, and depress the check ball at the top of the adjuster. While holding the check ball depressed, move the arm up and down. Looseness should be felt. Full plunger stroke should be 2.2mm. If not, remove, clean and bleed the lash adjuster.
    14.  


 
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