Need help identifying if this is indeed an E28 M5 or even BMW part?

Specific conversations and info for the BMW E28 M5 and M535i.
Post Reply
DiseaseWithNoCure
Posts: 83
Joined: Jan 30, 2017 12:46 AM
Location: Madison, WI

Need help identifying if this is indeed an E28 M5 or even BMW part?

Post by DiseaseWithNoCure »

I have been working on a 4 year E28 M5 revival and have had a weird backfire issue develop at a certain repeatable RPM that I can’t seem to work out...but that’s not what this post will be about.

Armed with that backstory, I finally caved and took it to a local’ish (90+ miles away) specialist (or maybe more appropriately “specialist”) who tested everything under the sun — and too could not get the issue addressed.

Moving on, upon pickup he handed me this part (photo below) and said “he found this lying on a frame rail but can’t identify where or what it goes to...but is definitely something BMW”.

https://ibb.co/LC3J3pG

Having four years of lift calisthenics and tear down experience on this car — I did not identify it whatsoever and frankly disagree...BUT here goes — can anyone say with certainty yes/no if this indeed could be from an E28 M5?

To me it appears more like a piece from a Harbor Freight tool but I have to ask...but I’ve been wrong once (maybe twice :-D) before in life...

(Thread soon to be started on the issue at hand - thanks in advance)
vinceg101
Posts: 4215
Joined: Jun 20, 2007 2:40 AM
Location: Los Angeles, CA

Re: Need help identifying if this is indeed an E28 M5 or even BMW part?

Post by vinceg101 »

You are not alone.
I found one of these little suckers in my M535i that I never could identify nor trace where it came from.
At the time I swore it came from the the brake system hydraulics but that was discredited. It obviously wasn't that important since I never put it back in and hasn't been missed in the subsequent years.
I still have this in a drawer in my tool chest.
Image
Image
DiseaseWithNoCure
Posts: 83
Joined: Jan 30, 2017 12:46 AM
Location: Madison, WI

Re: Need help identifying if this is indeed an E28 M5 or even BMW part?

Post by DiseaseWithNoCure »

Holy crap.

This is like finding out I have a long-lost sibling or something - I’m in total disbelief that you even included a photo hah!

Well...guess it IS a BMW part — now hopefully someone can identify that location or part number and we’ll really be set!
dsmith
Posts: 2322
Joined: Jan 20, 2012 1:52 AM
Location: Charleston, SC

Re: Need help identifying if this is indeed an E28 M5 or even BMW part?

Post by dsmith »

Broken tstat internals?
austin8753
Posts: 1155
Joined: May 16, 2010 1:37 AM
Location: Portland, Oregon, USA

Re: Need help identifying if this is indeed an E28 M5 or even BMW part?

Post by austin8753 »

dsmith wrote: Jan 03, 2021 11:45 PM Broken tstat internals?
sorta looks like the internals of the auxiliary thermostat, found on US spec e30s.
Preyupy
Posts: 239
Joined: Jun 21, 2012 12:48 AM
Location: Issaquah WA

Re: Need help identifying if this is indeed an E28 M5 or even BMW part?

Post by Preyupy »

It looks more like a one way valve or blow off valve but I don't recognize it. What is the diameter? Neither picture gives any kind of reference as to size.
M5BB
Posts: 1522
Joined: Jun 13, 2007 10:13 AM
Location: Peachtree Corners, Georgia

Re: Need help identifying if this is indeed an E28 M5 or even BMW part?

Post by M5BB »

I've totally rebuilt a couple S38 and M88's and have never seen that in or on an engine.
Some other parts of my M5 have never been apart so can't positively say it didn't come out of car.

It does look like a valve of some kind.
I have totally rebuilt my master and hydro boost and never saw that their either.

I'll send to a friend mechanic that has worked on BMW's all his life and see what he thinks?

Gary
jdb
Posts: 123
Joined: Jan 01, 2007 7:56 PM
Location: Humboldt County, Ca.

Re: Need help identifying if this is indeed an E28 M5 or even BMW part?

Post by jdb »

This was many years ago:
I do believe I have seen that part laying on the floor under a car that just had a accumulator (cannon ball ) replaced.
Most likely fell out of the DS regulator.

Jeff
Post Reply