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Dreaded front subframe crack....

jrhone

By jrhone,
in BMW 2002 and other '02

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irdave Grand Master

irdave

Posted
Posted (edited)
2 hours ago, 02tradition said:

 

Indeed, that dreaded drivers side motor mount is no respecter of men...

 

Nor women.  They all crack.  Just best to pick a time and get it done / do it.

 

And if Tom is selling a plate, buy that one.

Edited by irdave
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Dave.

'76, totally stock. Completely.

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'76mintgrün'02
'76mintgrün'02

I agree with the boxers.  Boxing sounds so nice and rectangular... but it is an odd shape to fabricate, if you want it to land on top of the two flanges.  I found that using a torch to get the piece g

thinksound_mike
thinksound_mike

Tom, that looks amazing. I would buy one for sure. It also shows that I have a long way to go with my welding! Look at those dimes!

thinksound_mike
thinksound_mike

I prefer cashews but they won't hold the mount in place. 

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'76mintgrün'02 Grand Master

'76mintgrün'02

Posted
Posted
6 hours ago, irdave said:

And if Tom is selling a plate, buy that one.

 

I did run across that pattern the other day.  I'd misplaced it.  I used tape to make it hold the bent shape, but I'd need a sub-frame here to confirm the fit before offering them up for sale. 

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The shape's a bit abstract and fitting it into the actual mount took some fussing.  In the end, I got the piece dull red hot and pushed it in while soft.  Before that insight, it was bend / test fit, bend / test fit, repeat... fussy and frustrating.  Now I could make them in much less time... provided I had something on which to test the fit

.

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jimk Grand Master

jimk

Posted
Posted

When I did my reinforcement in 2005, we cut a plate, ground to fit the channel, form the curvature with a 12lb sledge.  Fit like a glove!

A radiator shop is a good place to take a leak.

 

I have no idea what I'm doing but I know I'm really good at it.

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NYTransplant Proficient

NYTransplant

Posted
Posted

This thread got me a little paranoid, so while I had the car on the lift to change out wheels today, I took a quick peek.  Looks like it was already done.  Yay previous owner!!!

Tim Dennison

'72 BMW 2002 tii - Malaga,  '02 BMW Z3 Coupe Sterling Gray,  '09 BMW 650i - Carbon Black,  '15 BMW 228i Estoril Blue,  '19 BMW Z4 30 - San Francisco Red

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Mike A Mentor

Mike A

Posted
Posted
19 hours ago, Son of Marty said:

As Jim said do it, at one time it was thought that driving style was the cause but then the crack started showing up on more and more cars even the proverbial lil old granny with a automatic, my thought is it's a harmonic crack instead of a pure stress crack but thats just my guess?. 

Fatigue for sure

73 Tii stock build, Porsche Macan   , E46 330i Florida driver, 

….and like most of us, way too many (maybe 30 at last count) I wish I hadn't sold ?

 

 

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irdave Grand Master

irdave

Posted
Posted
6 hours ago, JerryC said:

Or just buy one from Ireland - $21:

http://www.iemotorsport.com/bmw/item/02leftmmreinf.html

 

 

I'm sure the IE part resolves the issue.  What it also does is make the part very thick- so often the motor mount doesn't fit well / only catches a few threads.  What I did was to shape a piece like what Tom has then box the section in (it's already a C, for those that haven't seen it) and leave a space to get to the nut- so full thread engagement and reinforced...

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Dave.

'76, totally stock. Completely.

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'76mintgrün'02 Grand Master

'76mintgrün'02

Posted
Posted
6 hours ago, jrhone said:

+1 for the Ireland part.  Why reinvent the wheel.  

I saved $21 plus shipping and did not have to wait for the mailman to bring it to me.

Generally speaking, I find it much more satisfying to make sh!t than to buy it.

 

5 minutes ago, Chris_B said:

Can the fix be done with the subframe in place, or must it be dropped? Not that I want to melt my motor mounts.

 

yes, I did mine in place and posted photos of that on page two of this thread.  It is crude though, compared to the one I did for Andy's car, with the subframe removed.

 

On mine, it was done preemptively, with no sign of a crack yet.  I just figured it was a good idea while I had the steering box out of the way.  


 

 

 

   

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tech71 Grand Master

tech71

Posted
Posted (edited)
On 8/2/2019 at 1:27 PM, NYTransplant said:

This thread got me a little paranoid, so while I had the car on the lift to change out wheels today, I took a quick peek.  Looks like it was already done.  Yay previous owner!!!

Me too now, you guys are killing me here!

Powertrain is going in on my next day off. No cracks.

 

IMG_3589.JPG

Edited by tech71
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76 2002 Survivor

71 2002 Franzi

85 318i  Doris

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Lagaeze Newbie

Lagaeze

Posted
Posted
On 11/28/2018 at 2:21 AM, jrhone said:

Pulling away from the house, I heard a strange thud, the steering wheel shimmied and the throttle blipped and then it all went back to normal.  Odd...then it did it again.  Pulled back into the garage, looked around the car and all seemed ok...then I popped the hood and pulled the motor and bam...The engine was flopping around.  Looking at the drivers side, I can see the separation just below the drivers side motor mount.  Now the plan is to find a good used subframe, weld in the reinforcement then swap it with my subframe.  Soooo...anyone have a spare subframe?  Preferably in SoCal...

 

 

Can I use your video? For a possible video on YouTube about this problem? Thank you in advance

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jrhone Grand Master

jrhone

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Posted
4 hours ago, Lagaeze said:

Can I use your video? For a possible video on YouTube about this problem? Thank you in advance


sure no prob

1976 BMW 2002 Fjord Blue Ireland Stage II • Bilstein Sports • Ireland Headers • Weber 38 • 292 Cam • 9.5:1 Pistons • 123Tune Bluetooth 15" BBS

2016 BMW 535i M Sport

1964 Volvo Amazon Wagon
http://www.project2002.com

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VWJake Mentor

VWJake

Posted
Posted

23317B00-612B-4490-9AAC-0A61330F89D9.thumb.jpeg.f8d4889ac50703447b6a1f14ff7ed617.jpeg


Any guesses as to why I wrote that on my template? lol

 

4B04FE77-2035-4169-96F1-47DD684185C4.thumb.jpeg.8d1397db850c6e960d55d6a88b787aac.jpeg

 

FC1D0DCC-02BB-4679-8E07-8CFD3B7B798D.thumb.jpeg.c7f7865ade964a9609ef99e837e7aaad.jpeg

 

1B469FFB-89AB-4CC0-BE4E-D77C9033F228.thumb.jpeg.b215901221b9a956ac49bb856f9add9e.jpeg

Wasn’t all bad though. The after the part was removed a quick clean up on it and it dropped right into place ready for the second pass. Geez...

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