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438 100 005 K-jet distributor connections

 
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Elrok  



Joined: 01 Jul 2019
Posts: 8
Location: POLAND

PostPosted: Fri Oct 25, 2019 5:55 pm    Post subject: 438 100 005 K-jet distributor connections Reply with quote

Hi!

I have bought the 438 100 005 K-jet distributor for my 924. The one that you are able to find on the photo:



I know that no:
1,2,3,4 are going into injectors.
6 is fuel supply line
7 is fuel return line.
but what is 5?

And also I know that it is not so simple to just connect the 6 and 7 to supply and return, but these shall be also connected with WUR and cycle valve etc. Could anybody post a photo of K-jet connections on the car?
It would be much easier to see it with location of the devices on the car than in the book:



I would appreciate any feedback.
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safe  



Joined: 18 Mar 2017
Posts: 91
Location: Sweden

PostPosted: Sat Oct 26, 2019 1:38 am    Post subject: Reply with quote

I can barley see the numbers, but du mean 5 in the middle on the top?
It goes to the WUR and it sets the control pressure.
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davidschmalz  



Joined: 26 Jan 2019
Posts: 10
Location: Los Angeles

PostPosted: Sat Oct 26, 2019 2:11 am    Post subject: Reply with quote

+1 on what safe said. As well as going to the WUR, it also goes to the inlet of the warm start solenoid.

I'd recommend using google images to help you out, although it is hard to get any kind of full picture, especially since the WUR is buried under intake etc.

I can say that the supply line includes a line running to the cold start valve/5th injector, and the return line includes a return from the WUR as well as a return from outlet of the warm start solenoid. It seems complicated on paper, but functionally it all makes a lot of sense.
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1979 Porsche 924 NA Petrol Blue
1982 Vanagon GL Air Cooled Monaco Blue over Kurilian Blue
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Elrok  



Joined: 01 Jul 2019
Posts: 8
Location: POLAND

PostPosted: Mon Nov 04, 2019 11:46 pm    Post subject: Reply with quote

Thank you very much for answers.

I have one more question: I tried to test the injectors and during the test one of the injectors spray much more fuel than the rest of them. I will do the test of the injectors in Bosch service, however I would like to ask if there is any any way to regulate each output (from 1 to 4). As you can see, I do not have the K-jet with regulation screw.
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safe  



Joined: 18 Mar 2017
Posts: 91
Location: Sweden

PostPosted: Tue Nov 05, 2019 1:55 am    Post subject: Reply with quote

Elrok wrote:
I would like to ask if there is any any way to regulate each output (from 1 to 4).


Not really. It could be that it is the injectors or it could be the fuel distributor.

Try moving the injectors around to see if the pattern moves with it. If it does you can get new injectors.
There is filters in the fuel distributor under the banjos, some might be clogged.

It could also be that the fuel distributor is worn and its not an easy DIY job to repair it.
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davidschmalz  



Joined: 26 Jan 2019
Posts: 10
Location: Los Angeles

PostPosted: Tue Nov 05, 2019 2:49 am    Post subject: Reply with quote

FWIW, I was having trouble with inconsistent fuel flow from injectors and the issue didn't move around with swapping them, so I rebuilt the FD. Full disclosure, I'm kind of a hack mechanic and still learning, so it took me two times to get it right. There are some good rebuild guides online, kits are cheap, and it certainly wasn't as difficult as I was expecting. All in all, a fun project!

I did have some trouble with my banjo bolts snapping on reinstall.
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1979 Porsche 924 NA Petrol Blue
1982 Vanagon GL Air Cooled Monaco Blue over Kurilian Blue
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Elrok  



Joined: 01 Jul 2019
Posts: 8
Location: POLAND

PostPosted: Tue Nov 05, 2019 9:22 pm    Post subject: Reply with quote

I have already disassembled the distributor after I bought it and fixed the problem with the plug (which was stuck and did not moved Ė it turned out that the problem was with o-rings and wrong position of the main middle part. After reassembling the plug is going very smooth .

I didnít checked the filters in holes 1-4 in fuel distributor. I didnít wanted to damaged them. What is the best way to take them out? In the previous distributor installed in my 924 (from KE-Jetronic) there were no filters. In my opinion these final filters are not necessary, because there is the filter on the input screw in fuel distributor and in the main middle part of it. I will try to remove the filters and test the injectors without them.

I really appreciate your support!
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