[Vwdiesel] Injection pump talks for beginners. ---( mostly the pump
h_hagar at prcn.org
Thu Aug 12 11:34:17 EDT 2004
Even if you are not a pumper , you may pick up a trick or two.
Talk is mostly about OLD VW's 1977 to 1986 or so.
FAQ : How many miles are they good for ?.
A : With proper lubrication they will last a lot of miles. I'm guessing 500 000.
With crappy fuel they may have to go in for rework at 60 000 Km.
FAQ : What is this talk about a Yellow polkadot pump ?
A : Wish I knew , I am still working on that one.
We are talking about a 1.5L NA pump for a 77 to 80 models. Simple ? right
clear as mud to me.
If your wife had the thing "Detailed" --steamclened and what not ---ups there went
the dot. Now what do we do ? Is there a way of measuring something to
identify a yellow pump without the dot ?
Having dabbled in these little delights for a while ---I would not be
surprised to find that the internal timing was changed. (advanced) Remember
the timing marks on flywheel and pump and bracket are fixed. To get better
performance , maybe Bosch changed the pump it self a bit.
The Bentley states that advancing timing for better performance is approved
by factory, ( remember hillbilly TUNING ? )
FAQ : Can a DIY do anything to these pumps ? or do they have to go
in for a rebuild. ? (very costly)
A : Yes after fooling around a lot ---I find it amazing how much can be done
with next to no tools. I do recommend an impact screwdriver (15 dollars)
They must have gorillas at bosch ---or they use some kind of lock-tite.
On the old Rabbit the most annoying problem is the leak at the cold start shaft.
That will empty the pump ----necessitating a fill-up at the outlet banjo.
Most important for beginner with starting troubles ---MAKE SURE PUMP IS FULL
to the brim --before cranking. Remove outlet banjo and look , fuel should
be near the top. Pump holds a LOT of fuel , shit to prime it you may
use half a liter or so.
PS : Trying to fill pump by cranking --- will not work on a lot of old Rabbits.
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