Jadz928

The Warm Up Regulator (WUR) is quite a piece of engineered work.

Figured I'd sacrifice one to take down all the way. Wasn't holding vacuum anyway.

Most of the bits are serviceable, but the two buggers that bothered me were access to the inlet screen (from the fuel distributor), and the vacuum/load (throttle) diaphram plunger.

The screen in pressed in, so the only way for it to come out is to destroy it.
I found around 6 screens, of different micron sizes. No easy way to clean it except to soak it (ultrasonic would help).
No wonder why folks have problems with control pressure issues!

Now, the diaphram plunger is a whole-nother ball of wax altogether. Not built to be servicable.
There are rivets and pressed/peened bushings.
The rivets are removable, but need to be drilled and pressed out. This is the only way to get the diaphram assy out.
Once out, there is no way to disassemble the diaphrams.

Does anyone know if Bosch sells subcomponents for WUR's, such as the diaphram assy?

FWIW, based on how it all goes together, it appears one could adjust the load plunger.

Also, is the WUR under vacuum at idle, or under throttle? My understanding of how the system works make me think vacuum is applied under throttle.
This relieves FP at the FD, and allows the barrel to raise, letting in more fuel.
I've read it otherwise, so was hoping someone could clarify.

SMTCapeCod

http://www.talkingwav.com/homer/homer_09.wav

Yikes...scariness.

Might as well associate one of the write ups. Thanks, OZ/J.P.:

jpitman2

I would either destroy the inlet screens, or blow them out from inside with air. Once out, apply a flame to burn off the lint etc. I have also seen the multiple layers in these. I would check with the guy at ferrarri400parts.com to see if he can help with the vacuum diaphragm issue - he can do most other parts.
jp 83 Euro S AT 54k

karl ruiter

At vacume (no load) the control plunger is sucked up, raising the control pressure and leaning out the mixture.

You can buy fine screen like this from mcmaster in various densities. I think it would be more than possible to come up with
a mcmaster part number for screen and a mcmaster part number for a punch that would allow you to punch replacement screens and slide them in place but as far as I know nobody has done so.

Mrmerlin

since your covering this here are rebuild instructions
https://rennlist.com/forums/928-foru...tructions.html

Jadz928

Yea, I can check into new screens. I have various diameter die-punches at work.

Thanks for the clarification.

Yea, I checked that out. However, his rebuilds don't discuss vacuum diaphram.

I'll check in with him anyway.


Thanks guys!

karl ruiter

What I have done before about the gasket is just go to pick-a-part. A WUR off a volvo, MB, or VW will be pretty similar and I have been able to cross over some of the parts. Not nearly as good as a new part, but....

Rob Edwards

Jim if you want to play with my ultrasonic cleaner, yell and I'll toss it in the mail to you. Don't have any pressing plans for it any time soon.

Jadz928

THAT IS A VERY KIND GESTURE, ROB. I'LL TAKE YOU UP ON THAT OFFER.
WOULD LOVE TO TRY IT OUT TO SEE IF THIS IS SOMETHING I COULD USE REGULARLY.

Thanks for the opportunity... and the opportunity to yell. (I just woke up everbody in the house)