Valve Spring: Service and Repair

REMOVAL
- Tools Required
- J 26999 10 Compression Gauge Adapter
- J 26999 30 Compression Gauge Adapter
- J 38606 Valve Spring Compressor
- Or Equivalent





1. Remove the valve rocker arm covers.
2. Remove the valve rocker arm shaft with the valve rocker arms. Mark the assemblies so these can be returned to the original locations.
3. Remove the glow plugs.





4. Remove the valve keys.
5. Rotate the engine until the piston for the cylinder being serviced is at TDC.
6. Install the compression gauge adapter into the glow plug hole.
7. Apply compressed air to hold the valves in place. If the compressed air is released, the valves can drop into the cylinder.





8. Use the valve spring compressor in order to compress the valve spring. If the spring will not compress, tap on the tool lightly with a mallet in order to loosen the cap or rotator from the valve keys.
9. Remove the valve keys.
10. Carefully release the valve spring tension. Remove the valve spring compressor.
11. Remove the cap or the rotator, the shield, and the valve spring with the damper.
12. Remove the valve stem oil seals.

INSTALLATION

CAUTION: Air pressure should remain applied to the cylinder for installation.

1. Apply a small amount of clean engine oil to the valve stem.
2. Install the new valve stem oil seals.
3. Install the valve spring with the damper, the shield, and the cap or the rotator.
4. Install the valve keys. Install the valve keys. Use grease in order to hold the valve keys in place. Carefully release the valve spring pressure. Make sure the valve keys stay in place. Remove the valve spring compressor or the compression gauge adapter.
5. Install the glow plugs.
6. Install the valve rocker arm shaft with the valve rocker arms.





7. Install the valve rocker arm covers.