REMOVAL & INSTALLATION
PREMIER AND MONACO
See Figures 1, 2, 3 and 4
A hydraulic tappet is located in each rocker arm. The tappet is in constant contact with the top of the valve stem and is nonadjustable. Oil pumped through the rocker shaft reaches the tappet through a passage in the rocker arm. The oil passes under the slots in the tappet thrust washer and into the tappet body. Air and oil are bled off through two small holes above the thrust washer. A squirt hole lubricates the camshaft lobe.
- Remove the rocker shaft assembly from the cylinder head. Refer to the rocker arm shaft procedures found earlier in this section.
- Disassemble the rocker shaft assembly.
- Remove the tappet from the rocker arm.
- Lightly coat the tappet, thrust washer and tappet bore with clean engine oil.
- Install the thrust washer with the slots toward the tappet.
- Install the tappet. The tappet may tend to fall out of the tappet bore. It may be necessary to use masking tape or tag wire to hold the tappet in place until the rocker shaft assembly is installed on the engine.
See Figures 5 and 6
The automatic lash adjusters are precision units installed in machined openings in the valve actuating ends of the rocker arms. Do not disassemble the auto lash adjuster.
- Remove the rocker arm shaft assemblies from the cylinder head. Refer to the rocker arm shaft removal procedures earlier in this section.
- Remove the lash adjuster retainers from the rocker arms, then remove the auto lash adjuster. Remove and install the auto lash adjusters one at a time.
- Slide the auto lash adjuster into the end of the rocker arm. Install the auto lash retainer clip to hold the adjuster in the rocker arm.
- Repeat the process for all of the auto lash adjusters.
- Install the rocker arm shaft assemblies onto the cylinder head.
See Figures 7 and 8
The valve train includes roller tappet assemblies, aligning yokes and yoke retainer.
Roller tappet alignment is maintained by machined flats on the tappet body being fitted in pairs into six aligning yokes. The yokes are secured by an alignment yoke retainer.
- Remove the cylinder heads and intake manifolds from the engine to gain access to the tappets.
- Loosen and remove the three retaining bolts, then remove the yoke retainer from the camshaft valley. Remove the six aligning yokes as well.
- Use the special tool C-4129 or a similar tool (even a magnet can help remove the lifters) to remove tappets from their bores. If all tappets are to be removed, identify the tappets to insure installation in their original location.
If the tappet or bore in the engine block is scored, scuffed, or shows signs of sticking, have the bore reamed to the next oversize and replace the lifters with oversize tappets.To install:
- Lubricate the tappets with clean engine oil.
- Install the tappets in their original positions.
- Install the aligning yokes to the tappets.
- Install the yoke retainer and tighten the retaining bolts to 9 ft. lbs. (12 Nm).
- Install the cylinder head and the intake manifolds to the engine block.
- Start and operate the engine. Warm up to the normal operating temperature.