The good old rocker shaft is the mast that holds your performance rocker arms together. It should spell strength and stability for it receives huge amount of pressure every time the car engine runs. Since your rocker shaft transports oil along each of the rockers, oil can also help you determine if you are having any shaft troubles. A rocker shaft is in tiptop shape if it exudes oil on your rocker arms in small quantities. But if your shaft oozes oil like an open faucet, then it's definitely time to replace them.
Difficulty level: Moderate
What you'll need:
- New rocker shaft
- Ratchet and socket set
- Torque wrench
- Clean rags
- Working gloves
Step 1: Disengage the negative battery cable and remove the cylinder head valve cover.
Step 2: Unfasten the retaining screws but do not remove them completely. Do this so that you can ease the tension on the timing belt.
Step 3: Remove the rocker arms and the rocker shaft assembly. Use your ratchet and socket set in unthreading the bolts. It is advisable to remove the bolts two turns at a time. Doing this will help you protect the rocker assembly from any kind of damage during the installation.
Note: Remember not to remove the no. 1 and 5 bracket screws. Immediately taking them off will cause the rocker arm and shaft bracket to spring out.
Step 4: Install the new rocker shaft. Grease the camshaft lobes and journals and slide the rocker arm assembly carefully onto the new shaft. Loosely mount the bolts. Make sure that they are arranged in the right order and with the marks on the shaft facing upward. These marks are for identifying the oil holes. Tighten the bolts two turns at a time.
Step 5: Put the tension back on the timing belt and adjust the valve lash. Re-install the cylinder head valve cover and reconnect the negative battery cable.
The entire replacement process will take approximately an hour for expert DIYers and probably two hours or more for novices.