Former VWDieselParts.com Forum

I did end up re-timing it down to factory specs (.85) but ended up putting the pressure back down again. Due to the internal wear on the pump, my timing ended up being much much worse.

I wouldn't start on all four cylinders in the cold (40*) and it would knock badly all the time. Even when it was warmed up completely it would knock.

Adjusted back down to 30psi it works perfectly again. It was at 20-25 when I started so this is a slight improvement.

I had to put back some of the washers/shims in the timer piston spring after increasing the fuel pressure in my injection pump (old 107A). I've read the timer spring does get a little softer over the years and increasing fuel pressure can cause too much advance. Good thing the washers (or shims) are easy to get to if you need to add or remove them.

I had to remove some shims from the bronze rabbit pump.
I could tell when I removed too many because it was very clacky, and got worse or stayed noisy at higher RPMs.