[Vwdiesel] Injection pump -- 1980 to 1986 --( pump dallyings ).

[gary]

Hagar,

The black coating...
I thought it was a baked-on graphite coating. At first I thought it was
just gunk built up over the years, but it wouldn't wipe or scrub off.
But I found that it would get very slick in presence of fuel. Makes
sense that it needs to be free to move. May very well be a anodized
coating. That is a low point in the pump and would need extra protection
against water and corrosion.

I'm not sure of the anodizing process, but bluing on our guns is a
controlled corrosion process. The metal is pickled in a weak acid.

-Gary 


On Sun, 2004-03-28 at 15:54, H.Hagar wrote:
> Some of you may know that my hobbyhorse is the injection system.
> 
> Many are interested but some think stupid questions  will derate the
> things they really know something about. Please come forward.
> 
> Gary Orlando        Gary gbangs at cfl.rr.com      I have a few questions for you 
> 
> I know that you took a couple (at least) pumps apart.    Looking at the timing ring ,
> what exactly is the BLACK coating ?.   Is it the same as we find on guns ?
> 
> The timing piston being light alloy the coating is most likely Anodizing -- agree ?.
> 
> For the newbies who just dropped in ,  a couple of comments.
> 
> It looks at first like we need more expensive special tools .  Not so.
> However I found an impact screwdriver handy.  A 3/8 drive one did it
> for me. Do they use Gorillas for tightening screws at wolfsburg ?.
> 
> Here is some important information.  ---- Governor locknut and the screw are both
> LEFT hand thread.   All the rest are standard.
> 
> Anyone who wants to know how I removed regulatorvalve just ask. I used
> a 3/8 drive deep socket and a cotterkey from rear wheel.
> 
> How to check Pump internal pressure   ? .  By the way those two dumpster
> gauges were not 2 inch , but 1.5 inch    real neat in front of windshield.
> 
> Here is how I did it  ,  take  a fuel in banjo and a drain banjo . Stacked them on a
> metric bolt-thread . Get hold of 3 nuts . Drilled a hole lenghtwise in bolt for fuel. Just
> use your own way ,I silver soldered the nuts together. And OUT banjo screws in to
> top nut.Do not remove screen from inside drain banjo.It protects orifice hole.
> 
> Well I have a pump to fiddle with so I must go.     Perfect day out there in front.
> 
> Hagar.
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