Increase Oil Pressure by Adding a Shim

1. Locate the relief spring. It is located behind the oil pump. You will need to remove both the timing cover and the oil pump cover.

2. Remove the scavenge pump.

3. Pull out shaft #3599-0061 holding the gear #3599-0041. As you remove the gear there is two washers located behind the gear (these have a tendency to fall as you remove the shaft -- remember there are two).

4. Remove the oil pump. Remove the three screws that hold it on. They are located in the three corners (the other screws hold the pump together and they do not need to be removed). The gear on the pump does not need to come off .After you have removed the three screws, gently pull the pump out. After the pump is off you will see a hole with a small collar around it -- this is where the o-ring goes. Also this is the part that you slide out.

5. Remove the valve. The valve is a round object that slides in the case and is about three inches long. You can remove it a couple ways: one is grab the collar with a pair of pliers, but be careful not to damage the lip or two, (the way I prefer) put a pair of needle nose pliers in the opening and expand them open. This will apply pressure to the inside of the valve. Now twist and pull. It will come out with some resistance. Once you have it out there is a snap ring on the other end. Remove the snap ring and watch all the parts go flying across your garage. Be careful of that. Once the snap ring is off, remove the orifice and the spring is behind that.

6. Shim the spring. Put a washer just behind the snap ring. I used 0.040" but you could go more. Or put a larger spring in there. After this is done, reinstall the valve. Be sure to oil the o-ring and twist it back in, but don't force it as this could destroy the o-ring. Now put it back together the way you took it apart.

Thanks to Bobby Baldwin for this information. Call with questions: 619-607-9536.