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Old 05-13-2019, 07:07 AM   #51
sksmith
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Have you thought about ordering NOS from the new Delorean Motor Company? They bought all of the NOS parts stock and plan to build new ones soon.
Pretty sure that they aren't coming with K-Jet PRV's though.
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Old 05-13-2019, 09:30 AM   #52
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You can also try 928 Classics. They are a Porche group but rebuild and bench test the WUR.
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Old 05-13-2019, 04:08 PM   #53
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http://k-jet.biz/
They sell rebuild kits and do exchanges. Might not be too expensive to just get a kit shipped from austrailia.
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Old 05-13-2019, 06:07 PM   #54
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The only useful parts in one of the many 'kits' I have seen is the diaphragm and perhaps the 'O' ring around the nozzle. The rest is BS.

I will be going down to the garage shortly to run the car through the warm up cycle to see if I have it professionally rebuilt or not.
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Old 05-13-2019, 07:33 PM   #55
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Default Technical update

Starting from cold (65 F) my lab quality $5 fuel pressure gauge reads 22psi quickly warmed up electrically to 48psi. After the heater kicked out pressure drifted down to 43psi where it remained.

Here is the pressure graft for the 0 438 140 066 WUR.



Those readings are sorta/kinda within the grey bar on the graph.

I think that that confirms that the failure was due to a clogged filter on the WUR input.

While the K-jet fuel system may be a step up from a carburetor system it is not at all as precise as modern O2 sensor feedback fuel management. The WUR handles the low temp/choke rich environment for starting and the O2 sensor and frequency valve manages the air/fuel ratio at operating temperature.

Awaiting discussion with WUR rebuilder.

Thanks for the comments along the way.

Last edited by TestPoint; 05-13-2019 at 08:07 PM..
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Old 05-13-2019, 08:02 PM   #56
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Quote:
Originally Posted by TestPoint View Post
The only useful parts in one of the many 'kits' I have seen is the diaphragm and perhaps the 'O' ring around the nozzle. The rest is BS.

I will be going down to the garage shortly to run the car through the warm up cycle to see if I have it professionally rebuilt or not.
Check that site carefully. They also have really detailed step by step rebuild manuals with pictures. I am sure if the parts does not come in a kit, they can get it for you.
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Old 05-13-2019, 08:09 PM   #57
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http://www.landsharkoz.com/images/pdf/wurfix.pdf
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Old 05-14-2019, 08:03 AM   #58
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Quote:
Originally Posted by sksmith View Post
Have you thought about ordering NOS from the new Delorean Motor Company? Steve
Indeed! They have them in stock, or at least they list a WUR but do not describe it as the 066 version so I will have to contact them to verify. They also do not list it as rebuilt which at about $250 shipped it must be. Their core deposit return is very restrictive. If you do not return EXACTLY the unit purchased you don't get the $250 deposit back.
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Old 05-14-2019, 10:38 AM   #59
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Default Bosch CIS rebuild sources

Well, that was a very nice conversation with John Hervey of DeLorean Auto Parts.

He said that if the control pressure matches the graft specifications and mine does that he wouldn't recommend rebuilding the unit. On the now missing filter screen he advises that he removes them and replaces with a porous bronze filter that just drops into the connector.

One is en-route!

Anyone with Bosch CIS fuel distributor, WUR or frequency valve issues should keep his contact information.

What a beautiful day! And I got the restroom footings completed.

Last edited by TestPoint; 05-14-2019 at 08:10 PM..
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Old 05-14-2019, 07:47 PM   #60
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Quote:
Originally Posted by TestPoint View Post
No one should ever create a spreadsheet accounting for restoration expenses.
My version of the sage counsel above -- no good ever comes from adding up everything you have in the car. Plausible deniability.

As expected Tom -- you get to the bottom of things. Mechanically and philosophically.
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Old 05-14-2019, 07:59 PM   #61
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Unfortunately, I just packed my WUR up in a box for an all expense paid trip to Texas.

Yesterday afternoon the control pressure cold and warm was just right. Engine warmed up to the middle of the temp gauge. I went out this afternoon with the intention of ending the detention on HF jack stands and found the pressure at about 10psi and a very rough idle.

Appeared that some of the destroyed screen is now in a critical point in the regulator.

Tired of screwing with it.

Off to see the wizzard!

Last edited by TestPoint; 05-14-2019 at 08:05 PM..
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Old 05-14-2019, 09:39 PM   #62
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Not sure if you read the write up on WUR I posted above but there is a way to adjust them.
But I would do just as you and send it out. My friend's 78 928 with K-jet had an issue that was
narrowed down to the WUR. Sent his to 928 Classics and now runs fine. I'm sure the Delorean guys
will get it right.
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