jtrygstad

Does anybody know the Bosch equivalent part number for the 928.606.109.04 warm up regulator for a 80 Euro S 4.7 K-jetronic. Mine says 0438140103 (Bosch).

I want to know if this is correct. I have seen other sources saying this should be 0438140036. I know I have other wrong parts on the car, so would like to have this one verified. This could explain some of my control and system pressure problems if the one I have is wrong.

Thanks,

GlenL

Don't know but this website should tell:

http://ecat-online.bosch.de/toc/frame1.html

Only works from real Internet Explorer.

Everyone who buys thier own parts should have this bookmarked. It'll tell what other cars use the same parts, for instance.

jtrygstad

Thanks Glen! Great site.

Now it is confirmed that I have the wrong part. The 1980 Euro S (M28.11/12) uses Bosch 0-438-140-086 warmup regulator.

That explains some things, but now I need a new WUR.

Luis_M

I found an old Bosch parts list for the 928 Euro S on the Bosch historical www.automotive-tradition.de database (in German) and it shows two different part #'s for the "warmlautregler" (WUR):

9/79-6/80 = 0 438 140 036
7/80-7/83 = 0 438 140 086

Both are shown with the same Bosch eXchange order # of F 026 Tx2 106

This suggests that these two original Bosch part #'s may be freely interchangeable.

danglerb

79 to 80 there wasn't an S, just the plain low HP 4.5L motor, the S was 80/83 only.

I would ask questions from a "knowledgeable" vendor.

tailpipe

the part number on the WUR really doesn't matter as long as the outside dimentions fit your car. whats more important is if the settings are set up right. the only way to know this is by setting up some gages and checking it. there is a thread on here on how to make your WUR more easily ajustable and how to check the presures

GlenL

Except that they're different.

Some have a vacuum control circuit and some don't. It's not just a matter of adjusting one to be like another.

Luis_M

The dates listed in my post correspond to manufacture dates, not model years. The site I posted is run by Bosch. They have the original parts lists for all 928 models in there if you dig a little.

9/79-6/80 = 0 438 140 036
7/80-7/83 = 0 438 140 086

Luis_M

I have an 1981 928S with the "036" WUR. I suspect the date ranges are when Bosch actually manufactured that part # for Porsche, rather than the Porsche build date. The 036 is hand stamped.

jpitman2

Mine is a Jan 83 build, and has -086 WUR. I have a spare unit, and I am building a rig to calibrate it with shortly. I have noticed in dismanlting a couple that the bimetallic heating coils have different resistances marked, but its a bit hard to see if the springs are different as well. I suspect that it wont make a serious difference. FWIW I bought a used unit off ebay Germany, and I asked if it was a '-086' unit, the guy said yes, so we did the deal.....the '086' was NOT the stamped no on the end, but a separate cast mark inside a little oval...Its actually a -005 off a BMW 323 IIRC.
The web shows your -103 listed for MB of the period - some instances of it on the 280 are visible. There was a Bosch fitting chart pdf on the web once (on pc at home) showing their part nos on all relevant cars.

What problem are you experience with your incorrect model of WUR? Has its behaviour changed recently? If it ever did seem to work correctly for your car (ie,good cold starts,good hot idle and power), and something has changed lately, I doubt that its related to the WUR model no, more likely the typical build of of crud causing bad control pressure. Of course, if its always had some issues in this area, then it needs to be sorted. You might find its worth searching for a WUR under the German name if not found under WUR.
jp 83 Euro S AT 52k

Jadz928

Alright, I need some help with something confusing me.

The 036 number matches a couple few WUR's I have for 77/78.

What is the 053 WUR? I have a new one, and am curious where it fits into the mix.

928 Intl lists 053 available new or rebuild for 78-79.

Here's some comparative pics (left 053, right 036)

jpitman2

My bosch efi application pdf does not list 053 at all. Autoatlanta lists 053 for a 76-80 924.
jp 83 Euro S AT 54k

Hilton

The 036 was used up to June 1980. From July '80, the K-jet 4.5's used 087

This is a great document

http://www.cannell.co.uk/Bosch_Techn...plications.pdf

Jadz928

It is good. I used this excerpt:



So the box this 053 came in reads Porsche p/n 928 606 109 02

I'm a little PET challenged (no PET7), but I'm only seeing:
928 606 109 04
928 606 109 DX
928 606 109 05
928 606 109 EX

Luis_M

Below are the "official" parts lists by model and region from the Bosch database. The excerpt you included is taken from ROW 4.5L list. Numbers were different for USA cars, and there does appears to be some duplication between porsche and bosch part numbers (ie. some porsche parts changed bosch #'s over time, and some bosch #'s were used for more than one porsche part #). The part is the "warmlaufregler". I put some other translations on the 4.7L list (the car I have). The dates quoted seem to be production dates for Bosch. My 1981 4.7, early production, has a .036 WUR, for example, not the .086.

ROW 4.5L used .036, replaced by .087 in 7/80 (both porsche p/n .04)

ROW 4.7L Kjet used .036, replaced by .086 in 7/80 (both porsche p/n .05)

USA 4.5L Kjet used .023 (9/77-2/78), .053 (9/77-7/79), and .063 (9/78-7/79). Looks like .023 was only on very early 5 speeds, but the others had overlapping production. My best guess is that the USA manuals (porsche .02 part) used the .023 initially, replaced by the .053 and probably later by the .063, but the automatics (porsche part .03) used the .053 for sure in the later cars but possibly for the entire auto-trans production. USA CIS owners can help confirm this.

You can get these yourself at http://www.automotive-tradition.com/.../recherche.htm

Hope this helps. I would bet your #1 and #6 cars probably had .036 WURs out of the factory.

Luis

1981 928 Euro S 5sp