GM 88891775
Valve Seals, Bronze

You need three tools to fix the Valve Stem Oil Seal: break out the Spark Plug port adapter (J 22794), valve spring compressor (J 38606), and valve seal installation tool (J 42863). Take off the Rocker Arm parts along with the spark plugs first. Spin the engine to keep the piston at the upper most position before entering the cylinder to avoid valve damage. The Spark Plug port adapter (J 22794) fits into the cylinder head to block valve movement as compressed air fills the chamber. Use the valve spring compressor j 38606 to press down on the valve spring before taking out the keys valve cap and the spring. Unseal the bottom part of the seal to take out the Valve Stem Oil Seal. To avoid oil seal damage when placing it on the valve stem use only manual pressure while inserting the valve seal installation tool (J 42863). The valve seal installation tool helps position the valve stem seal onto the guide after you press it with the tool. To complete installation put on the valve spring using the valve spring compressor. Place each key in its valve position and follow this method for the rest of the valves. To complete the process you need to deactivate the cylinder pressure then install the Spark Plug by using the Spark Plug port adapter (J 22794).

Install the spark plug and the valve rocker arm assemblies.

Loosen the EN 46110 valve spring compressor nut, then remove the valve spring retainer and valve spring.

Use the Valve Spring Compressor (J 38606) to install the valve spring and the valve cap, then install the valve keys.

Use the Valve Spring Compressor (J 38606) to compress the valve spring, then remove the valve keys, valve cap, and valve spring.

Use the EN 46117 Valve Stem Key Remover/Installer to remove the valve keepers.

Remove the valve rocker arm(s) and push rod(s), followed by the spark plugs.

Depressurize the cylinder, remove the Spark Plug Port Adapter (J 22794), install the spark plug, and finally reinstall the valve rocker arm assemblies.

Remove the EN46110, disconnect the J39313 from the air source, take out the J39313, and finally install the spark plugs, rocker arms, and camshafts. Remove the EN46106 and reinstall the starter motor.

Use the Valve Stem Seal Installation Tool (J42863).

Place the new oil seal over the stem until it contacts the valve guide, ensuring it is fully seated, and use hand pressure to push it over the valve guide with the J 42863 (Valve Stem Seal Installation Tool).

Spark Plug Port Adapter (J 22794), Valve Spring Compressor (J 38606), and Valve Stem Seal Installer (J 42863).

To prevent the valve from falling into the cylinder.

Ensure the engine is rotated so the piston in the cylinder being worked on is at top dead center to prevent the valve from falling inside the cylinder.

Release the valve spring, then remove the air pressure and the Spark Plug Port Adapter (J 23590).

Use hand pressure to place the new valve stem oil seal over the stem until it contacts the valve guide, ensuring it is fully seated.

This is to prevent the valve from falling into the cylinder.

Begin by removing the valve rocker arm and push rod, followed by the spark plug.

Install the Spark Plug Port Adapter (J22794) into the spark plug port and apply compressed air to hold the valves in place.

Compress the valve spring again with the J 38606, install the valve locks (using grease if necessary to hold them in place), and then release the spring.

Apply compressed air through the Spark Plug Port Adapter.

Release the air pressure, remove the Spark Plug Port Adapter (J 22794) from the spark plug port, and then reinstall the valve rocker arm and the spark plug.

Ensure the piston in the working cylinder is at top dead center (TDC) to prevent the valve from falling into the cylinder.

Inspect the valve spring for any damage and replace if necessary.