Bolt size....please?!?

E28 technical advice asked and given! Troubleshooting, modifications and more.
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5timesturbo
Posts: 274
Joined: May 26, 2013 3:24 AM
Location: Fayetteville, Ga

Bolt size....please?!?

Post by 5timesturbo »

I want to put my engine on an engine stand as I rebuild it. It’s an engine that I put down in my buddies shop almost 5 yrs ago. I moved two times I’m sure the bolts used to connect the tranny bellhousing to the engine has long been lost. I wanna buy some bolts on the way there....if anyone knows the size bolts I would appreciate the help greatly.

Thanks!
vinceg101
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Joined: Jun 20, 2007 2:40 AM
Location: Los Angeles, CA

Re: Bolt size....please?!?

Post by vinceg101 »

Your request was missing some key information if you want help: What is you engine? Transmission? Year?
All bolts would be listed on RealOEM.com. Look them up.
5timesturbo
Posts: 274
Joined: May 26, 2013 3:24 AM
Location: Fayetteville, Ga

Re: Bolt size....please?!?

Post by 5timesturbo »

87 535i manual.
Mike W.
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Joined: Feb 12, 2006 12:00 PM
Location: California Whine Country

Re: Bolt size....please?!?

Post by Mike W. »

https://www.realoem.com/bmw/enUS/showpa ... Id=23_0504

Though slightly inaccurate as they're all external torx, but close. Personally I use conventional hex head as it minimizes stripping and allows a wrench.

However, if you're going to be mounting it to an engine stand, you need to look at it, determine which holes you're going to be using, 8MM or 10MM, measure the sleeve length and add half an inch or so to that dimension.
///M
Posts: 30
Joined: Apr 17, 2009 11:21 PM

Re: Bolt size....please?!?

Post by ///M »

Hi Mike W
The thing with the torx in some cases is that in some applications you cannot use a conventional hex head bolt. It fits in but you cannot tighten them up as there is no room for a socket to fit over and no room for a spanner. I think it applies more to later models where they were designed with torx in mind.
I cannot remember what BMW it applies to but I can remember fitting a gearbox without bolts and used hex heads but they would not work in a couple of holes. The torx I had were the wrong size. Had to use "Allen" head bolts. When the torx were introduced a lot were damaged from the use of the incorrect tools as the torx bits were so expensive.
Mike W.
Posts: 25674
Joined: Feb 12, 2006 12:00 PM
Location: California Whine Country

Re: Bolt size....please?!?

Post by Mike W. »

///M wrote: Jan 17, 2022 1:01 PM Hi Mike W
The thing with the torx in some cases is that in some applications you cannot use a conventional hex head bolt. It fits in but you cannot tighten them up as there is no room for a socket to fit over and no room for a spanner. I think it applies more to later models where they were designed with torx in mind.
I cannot remember what BMW it applies to but I can remember fitting a gearbox without bolts and used hex heads but they would not work in a couple of holes. The torx I had were the wrong size. Had to use "Allen" head bolts. When the torx were introduced a lot were damaged from the use of the incorrect tools as the torx bits were so expensive.
I certainly find that believable on the newer stuff, as I've mentioned a few times they design them to build them not to work on them later. But on E28s, hex head bolts will work.
5timesturbo
Posts: 274
Joined: May 26, 2013 3:24 AM
Location: Fayetteville, Ga

Re: Bolt size....please?!?

Post by 5timesturbo »

Mike W. wrote: Jan 16, 2022 8:15 PM https://www.realoem.com/bmw/enUS/showpa ... Id=23_0504

Though slightly inaccurate as they're all external torx, but close. Personally I use conventional hex head as it minimizes stripping and allows a wrench.

However, if you're going to be mounting it to an engine stand, you need to look at it, determine which holes you're going to be using, 8MM or 10MM, measure the sleeve length and add half an inch or so to that dimension.

Dude! Thank you for the pic and thoughts
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