[urq] k-jet rebuild

[SpotatAshleys]

Pat
That's quite an achievement. Well done! I would very much like to see the 
pictures as I have contemplated doing this myself having had an intermittent 
fault that I suspect is the plunger sticking. But as it has not done it for 
a while I have of course put off tackling it. If it happens again the bullet 
will have to be bitten.
Happy New Year

All the best

Keith
'87 WR


----- Original Message ----- 
From: "Patrick Carlier" <p.carlier at pandora.be>
To: <urq at audifans.com>
Sent: Tuesday, December 30, 2008 7:49 PM
Subject: [urq] k-jet rebuild


> Thought I'de share this with the list .
> It is quite possible to open up the k-jet fuel distrubutor .
> Clean it and put it back together again . Did it two days ago .
>
> Mine was stuck .
> When I re installed the fuel system , by habit I pushed the metering plate 
> .
> Expecting the typical bounce back .
> Nothing happend , it was stuck as if it was fused .
> Further ivestigation showed the metering plate was ok , but
> the fuel distributor the plunjer would'nt move .
>
> So I cleaned up the workbench ( took half a day :)) , put some paper towel
> on it .
> And carefully took it apart . First took off the two screws on top .
> Then put it upside down in a vice and gently removed all the bottom screws 
> .
> Carfully , there are springs inside .
> Then wiggled of the bottom side .
>
> Took out the rvs membrane , carefull very suscpetible to damage , and then
> plunjer with its housing .
> Removed everey non metal part from the plunjer assembly and soaked it in
> WD40
> overnight . It was still stuck , so I applied a little force to push it 
> out
> .
> No hammering , but a c-clamp kinda thing , with wooden blocks protecting 
> the
> metal .
> Cleaned it in degreaser and that did the trick . It's moving again .
>
> At first I put it back together again with nothing more then a gentle
> cleaning .
> But then it leaked fuel between the two halfs .
> So I had to take it apart again , and applied a very light coat of liquid
> sealant .
> to both halves . Aplied with a small nylon brush .
> The stuff I used was red , so it was very visible .
> Be carefull not to apply te coating to the tiny little holes and passages 
> .
> And the coating has to be be fuel resistant ofcourse  .
>
> After that , the K-jet was tight as a drum and fully functional !
> A new metering head is listed 2300? ( 3,500USD ) in etka .
> Well worth the effort of trying to revive it , isn't it .
>
> One cant't help but to admire the craftmanship it took to build the  k-jet 
> .
> It's obsolete now , but in carburettor day's it was quite an invention .
> And as a metal worker , I'm sure I could'nt accomplish that kind of
> precision .
> Fi , between the moving plunjer and its housing , there isn't a single 
> seal
> ; o-ring , pistoi ring , whatever .
> Still , it has 4 bar of fuel on it , and it doesn't leak a drop .
>
> Anyone wants to see pictures of the internals , drop me a mail and I'l 
> send
> them .
>
>
> Pat
> 1981 WR engine running !!
>
>
>
>
>
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