Chrysler Full-Size Trucks 1967-1988 Repair Guide

Valve Stem Seals

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REMOVAL & INSTALLATION



Cylinder Head Installed

For this procedure, you will need an air compressor, a spark plug adaptor and a dummy shaft.

If valve stem oil seals are found to be the cause of excessive oil consumption, the seal can be replaced without removing the cylinder head.

The procedure below applies to both gasoline and diesel engines.

  1. Remove the air cleaner.
  2.  
  3. Remove rocker arm covers, spark plugs, (if gasoline, or injectors (if diesel).
  4.  
  5. Unplug the coil wire from the distributor, if gasoline.
  6.  
  7. Turn the engine so that No. 1 cylinder is at Top Dead Center on the compression stroke. Both valves for No. 1 cylinder should be fully closed and the crankshaft damper timing mark is at TDC. The distributor rotor will point at the No. 1 spark plug wire location in the cap, (if gasoline). On diesel engines, use a timing gauge to align to TDC.
  8.  
  9. Remove the rocker shaft and install a dummy shaft.
  10.  
  11. Apply 90-100 psi air pressure to No. 1 cylinder, using a spark plug hole air hose adaptor.
  12.  
  13. Use a valve spring compressor to compress each No. 1 cylinder valve spring then remove the retainer locks and the spring. Remove the old seals.
  14.  

To install:
  1. Install a cup shield on the exhaust valve stem, as well as the intake valve stem. Position it down against the valve guide. Push the valve stem seal firmly and squarely over the valve guide. Do not bottom the seal on the guide, leave 0.06 in. (1.6mm) gap.
  2.  
  3. Compress the valve spring only enough to install the lock.
  4.  
  5. Repeat the operation on each successive cylinder in the respective firing order, making sure that the crankshaft is exactly on TDC for each cylinder.
  6.  
  7. Remove the dummy shaft, and install the original rocker shaft.
  8.  
  9. Replace the rocker arms, covers, spark plugs, coil wire, (if gasoline), injectors (if diesel).
  10.  

Cylinder Head Removed
  1. Remove the cylinder head as outlined. Place head on flat clean surface.
  2.  
  3. Turn the camshaft so that both valves for No. 1 cylinder should be fully closed.
  4.  
  5. Remove the rocker shaft and install a dummy shaft.
  6.  
  7. Use a valve spring compressor to compress No. 1 cylinder valve spring, then remove the retainer locks and the spring. Allow the valve to fall out. Mark valve as to which cylinder it belongs to, and whether it is an intake or an exhaust valve.
  8.  
  9. Remove the old seal with a suitable tool, making sure you do not score the sides of the hole.
  10.  

To install:
  1. Install a cup shield on the exhaust valve stem, as well as the intake valve stem. Position it down against the valve guide. Push the valve stem seal firmly and squarely over the valve guide. Do not bottom the seal on the guide, leave 0.06 in. (1.6mm) gap.
  2.  
  3. Install the valve and spring, then compress the valve spring only enough to install the lock.
  4.  
  5. Repeat the operation on each successive cylinder in the respective firing order, making sure that the crankshaft is exactly on TDC for each cylinder.
  6.  
  7. Remove the dummy shaft, and install the original rocker shaft.
  8.  
  9. Replace the cylinder head to the engine block.
  10.  

 
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