internal injection pump pressure

Technical questions and answers concerning all models of VW diesel vehicles.

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Frankinstyn
Glow Plug
Posts: 2
Joined: Mon Dec 05, 2016 11:35 am
Location: Tacoma, WA

Re: internal injection pump pressure

Post by Frankinstyn »

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.
sgnimj96
Turbo Charger
Posts: 259
Joined: Thu Feb 20, 2014 2:08 pm

Re: internal injection pump pressure

Post by sgnimj96 »

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.
81' Scirocco 1.6D (conversion)
86 Golf 1.6D
85' 300TD
Fatmobile
Global Moderator
Posts: 7564
Joined: Wed Oct 30, 2002 10:28 pm
Location: north central Iowa

Re: internal injection pump pressure

Post by Fatmobile »

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.
'91 Golf gasser converted to a 12mm pump, M-TDI.
'84 1.6TD Rabbit with a VNT-15 turbo, still setup to run on vegetable oil.
'84 GTI with 1.7TD pistons and intercooled.
2003 TDI wagon
2000 TDI Jetta.
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