Drive Shaft Bolt Size

[kyalami]

I can't believe I'm needing to ask this but I can't find anything via search either here or Google.  

 

What size is the bolt to split the driveshaft in the center?  Looks like a 21mm or 22mm and you need to likely modify the wrench to get it to fit?  While I have the driveshaft out, I'm finally getting around to replacing the CSB that has been sitting in the garage for years...

 

Jason 

[tzei]

This? Pos. 5

Drive shaft, univ.joint/center mounting | BMW 1502-2002tii 2002 M10 Europe

BMWFANS.INFO

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Drive shaft, univ.joint/center mounting | BMW 1502-2002tii 2002 M10 Europe

Yes you need to modify the wrench. 

[kyalami]

That's the one!  Thank you!  I was way off... looks like I need a 27mm 12 point.

[TobyB]

...then why do I have a modified 24mm wrench for taking them apart?

 

Hmmm.

Later versions (E21?) were held together with a bolt, but I remember that

having an even smaller head, like 17 or 19.

 

I'd suggest measuring it, before you grind!

 

t

it's been too long...

 

[Son of Marty]

Don't forget to index the splines.

[jimk]

2 hours ago, tzei said:

This? Pos. 5

Drive shaft, univ.joint/center mounting | BMW 1502-2002tii 2002 M10 Europe

BMWFANS.INFO

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Drive shaft, univ.joint/center mounting | BMW 1502-2002tii 2002 M10 Europe

Yes you need to modify the wrench. 

I never needed anything other than a std Craftsman box end wrench.   Set the driveshaft section at an angle and slip the wrench on the nut.

[kyalami]

Yup - it’s a 27mm on my car. My 1in ring wrench ground down worked just fine despite being a tad big.  

Fortunately Ireland marked it when they shortened it, so all good there.  

 

[Preyupy]

Every 2002 driveline I have ever taken apart that nut was 24mm.  Use a 12 point end wrench and you need to grind the thickness down to about 60-75% of the original thickness (Craftsman combination wrench, still have it in my tool box after 45+ years) 

[tech71]

29 minutes ago, Preyupy said:

Every 2002 driveline I have ever taken apart that nut was 24mm.

Possibly an after market replacement, quite a bit cheaper and a lock nut to boot.

 

Conical Lock Flange Nut Smooth Class 10 Steel Fine Thread DIN 6927 - BelMetric

BELMETRIC.COM

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Bel-Metric sells metric hardware & specialty automotive supplies nationwide. Visit our website to purchase metric fasteners, nuts, bolts, Time-Sert kits & more.

 

Edited March 10, 2023 by tech71

[kyalami]

40 minutes ago, Preyupy said:

Every 2002 driveline I have ever taken apart that nut was 24mm.  Use a 12 point end wrench and you need to grind the thickness down to about 60-75% of the original thickness (Craftsman combination wrench, still have it in my tool box after 45+ years) 

🤷🏼 

[larry_in_socal]

This topic is nuts!!  LOL

[jimk]

I guess I'm living right.

1 hour ago, Preyupy said:

Every 2002 driveline I have ever taken apart that nut was 24mm.  Use a 12 point end wrench and you need to grind the thickness down to about 60-75% of the original thickness (Craftsman combination wrench, still have it in my tool box after 45+ years) 

 

[ray_]

2 hours ago, kyalami said:

Yup - it’s a 27mm on my car. My 1in ring wrench ground down worked just fine despite being a tad big.  

Fortunately Ireland marked it when they shortened it, so all good there.  

 

Your inches must be bigger than mine.

 

27mm is much bigger than 1 inch.

 

🤪

[ray_]

2 hours ago, kyalami said:

Yup - it’s a 27mm on my car. My 1in ring wrench ground down worked just fine despite being a tad big.  

Fortunately Ireland marked it when they shortened it, so all good there.  

 

Your inches must be bigger than mine.

 

27mm is much bigger than 1 inch.

 

🤪

[Son of Marty]

25.3 mm to the inch 27mm= 1.062.