I started with the buffer, it is used when going from forward to reverse suddenly. It will bypass the sudden pressure spike to keep from braking things. It has two valves in it, one was stuck and had to be pulled. It also had some trash in it so i gave it a good cleaning and reassembled. I am not sure what the trash was but the PO had used gasket shelac everywhere, i think it was some of that but the stuff was too small to ID.
Next was the motor itself. I pulled the accel valves and disassemble them, cleaned and checked. Made sure the bleed holes were open, they are so small my smallest torch cleaned wouldnt fit I had to use a single strand of wire from a stranded 18AWG wire. I could pass air through the holes after that, didnt try before.
Next the cylinder housing so I could access the pistons and cylinders. No real problem there except for the shelac. The slippers on the pistons looked good and all the lube holes could pass air. I then pressed off the cylinder assy with the pistons still in. (This type has matched pistons to cylinders that are not interchangeable) After pulling the cylinder assy I could see the valve plate. It had very deep scoring in the mating surface and the mating surface of the cylinder did also. The manual says that if you can feel the scoring with your fingernail to replace the valve plate. The scoring could be felt with your finger tips, it was Deep and wide.
Being the type of person i am I figured nothing ventured, nothing gained. I broke out the flate plate and sandpaper. I started with 150grit and went through 2500 grit on the valve plate. (final thickness was 0.147inch) I did the same on the cylinders mating surface. Thouroughly cleaned both with carb cleaner and paper towels to remove all residue. Using lots of oil, i reassembled the pistons, cylinder,and valve plate.
Thats about as far as i have gotten. It will be a few more days before i have time to put it all back together and get new test results.
Here are some pics of the valve plate.
Edited by coldone, May 28, 2012 - 05:55 PM.