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Exhaust manifold

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jsspagg
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Joined: Fri Jun 27, 2014 3:11 pm
Location: Southern California

Exhaust manifold

Post by jsspagg » Mon Nov 09, 2020 5:29 am

I have a 1980 Euro 635 M90 engine. It's been 10 years since it was last on the road and I am going through pretty much everything in order to get it back on the road. I have been using realoem.com to get the part numbers for replacements. There have been a few discrepancies that I have been trying to work through. Maybe someone here can provide some insight. I'll start with two current issues:

1) realoem.com tells me the output shaft bellows repair kit is part number 33219067913. I ordered this part number from my local BMW dealer in August. Recently they told me it's not available. Looking at another site- FPC Euro, they do not have this part number but suggests part number 33219067912. Is there is a difference?

2) The exhaust manifolds that I removed have the part number 1250603 clearly stamped on them- both front and back. I cannot seem to source this part number. Realoem.com lists the part as 1250601. 1250601 part is available and as best I can tell, appear to be the same as what I currently have, but afraid to make the purchase at over $300 each. Anyone know if there is a difference?

Also, anyone know if the the gasket (#4) with the heat shield (for the plug wires) has the same fitment as the standard gasket (#3) ?


Thanks for any insight.
Attachments
Exhaust Manifold.jpg
Exhaust Manifold.jpg (900.37 KiB) Viewed 182 times
realoem exhaist gasket.JPG
realoem exhaist gasket.JPG (73.98 KiB) Viewed 182 times

Pasocb
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Location: Paso Robles CA

Re: Exhaust manifold

Post by Pasocb » Tue Nov 10, 2020 9:24 pm

jsspegg,

The exhaust manifolds from my 07/1980 build date Euro 635 are pictured below.
Front and back are slightly different: 1 274 808 HD 1 and 1 274 808 HD 2.
In my last engine build, I used the larger gaskets with the integral heat shields without issue.
Attachments
IMG_3485.JPG
IMG_3485.JPG (1003.75 KiB) Viewed 149 times
IMG_3485.JPG
IMG_3485.JPG (1003.75 KiB) Viewed 149 times
1981 635 Hennarot
1980 635 Polaris (Project)

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Ralph in Socal
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Re: Exhaust manifold

Post by Ralph in Socal » Wed Nov 11, 2020 1:34 am

OP - I suggest you do a lot of research to determine what manifolds you have

M90 factory exhaust manifolds are not the same as M30 manifolds. And the M90 manifolds are probably NLA at the dealer. Good luck

Ralph
There is a very fine line between "Hobby" and Mental Illness.

85 635csi Zinno Auto
84 528i Euro
83 635 Euro Arktik
81 528i Kastanien 5-speed
88 528e Bronzit (Granpa Car)
86 535i Auto (For Sale)
81 633 csi (retired)

jsspagg
Posts: 7
Joined: Fri Jun 27, 2014 3:11 pm
Location: Southern California

Re: Exhaust manifold

Post by jsspagg » Sat Nov 21, 2020 4:39 am

I was able to do a repair on the manifold so at least for now, I wont need a replacement.

I sourced a gasket with the heat shield so I will install that when the time comes.

In the meantime, any input from anyone on the output shaft bellows?

bpoliakoff
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Re: Exhaust manifold

Post by bpoliakoff » Sun Nov 22, 2020 12:00 am

I have a good one
81 Euro 635 M90 with motronic. Currently under a complete nut and bolt restoration. Pictures at
flickr.com/photos/bertsphotos.

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Ralph in Socal
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Re: Exhaust manifold

Post by Ralph in Socal » Sun Nov 22, 2020 6:41 pm

On the output shaft repair kits, look at the new ones carefully

At the metal flange that the bellows attaches to, the early e12 (Series 1) flange is flat and uses halfmoon washer strips

The flange for later style (Series 2) has raised areas so you have to use the later style washer strip That has 2 holes bridged by a metal strip

You will not be able to use the halfmoon washer strips on the new style flanges

Ralph
There is a very fine line between "Hobby" and Mental Illness.

85 635csi Zinno Auto
84 528i Euro
83 635 Euro Arktik
81 528i Kastanien 5-speed
88 528e Bronzit (Granpa Car)
86 535i Auto (For Sale)
81 633 csi (retired)

bpoliakoff
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Re: Exhaust manifold

Post by bpoliakoff » Sun Nov 22, 2020 8:34 pm

Hey Ralph, when I rebuilt mine, I just ordered a set of rebuild kits from some internet parts provider. i can't remember if they were model year specific, but they worked fine with the 1/2 "moons"
81 Euro 635 M90 with motronic. Currently under a complete nut and bolt restoration. Pictures at
flickr.com/photos/bertsphotos.

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Ralph in Socal
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Re: Exhaust manifold

Post by Ralph in Socal » Sun Nov 22, 2020 10:05 pm

Just providing the OP with some insight into a possible problem.

I’m lucky to have plenty of the later washers but others may have to buy 12 of them

Ralph
There is a very fine line between "Hobby" and Mental Illness.

85 635csi Zinno Auto
84 528i Euro
83 635 Euro Arktik
81 528i Kastanien 5-speed
88 528e Bronzit (Granpa Car)
86 535i Auto (For Sale)
81 633 csi (retired)

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