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R60 Front Fuel Tank Mount Bolt?

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paul25g
Posts: 89
Joined: Wed Jul 25, 2012 9:10 am

R60 Front Fuel Tank Mount Bolt?

Post by paul25g »

Hi Guys,

I've got a '58 R60 that I got in pieces and am in the process of putting back together. This bike has the larger 6.5 gallon Sport tank. I've been trying to restore it to original as much as I can.

Everywhere I look, the front fuel tank mount bolt is described as M8X1X100. Going through the bag of bolts that came with this project, I found a bolt that matched that description. It is a shoulder bolt with only the last inch or so threaded.

As you can see in the attached pic, this bolt is so long that I can't secure the tank. Obviously, if more of the bolt were threaded I could tighten the nut up, but the real question is, why should this bolt be so long?

So here's my questions:

1. Is 100mm length listed for this bolt a typo on every parts list (and Vech's website) I have seen?
2. Would the sport tank use a shorter bolt than a standard tank?
3. Am I missing some kind of spacer for the front of the tank that would take up more of the 100mm bolt called for?

I realize I could just use a shorter bolt and call it a day, but as I said, I'm trying to do a pretty spot on restoration and would like to know what the deal is with this bolt. I can't imagine that a bike that is so well put together in every other way would have a super long bolt here that isn't necessary.

Any input is appreciated!

Thanks!

Paul
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Beemer100
Posts: 148
Joined: Tue May 15, 2018 5:32 pm

Paul, just checked my R50 and

Post by Beemer100 »

Paul,

just checked my R50 and it has a 70mm long bolt which fits nicely considering the washer and the nut. I also checked my R69S (however, only through fotos since the bike is not in my garage) and it also has a bolt which ends right after the tightened nut. So, my assumption would be that 70mm is the proper length. Oh, BTW, both bikes have the Mayer Sports tank.

One thing you have to take care of when you mount the tank to the frame ... make sure there is no stress whatsoever when you tighten the bolts. If there is little gap between the "ears" of the tank and the frame .. please shim it. You want to avoid that the bolt bends the mounting ears towards the tank. Once filled up, these tanks are pretty heavy and with the vibrations of the engine you easily get a stress crack ...

I hope my english is clear enough

cheers
KLaus

R68
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Trivia...

Post by R68 »

....the 10cm bolt is for the standard tank, the 7cm bolt for sport and Hoske tanks..."Meier" sport tanks were marketed by Georg Meier aka "Schorch" after his riding days were over and he got the BMW dealership for Munich, I'd assume the most profitable BMW dealership in Germany? Incidentally, he had been Admiral Canaris's driver for a time during his Wehrmacht days, I'm told?...

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paul25g
Posts: 89
Joined: Wed Jul 25, 2012 9:10 am

Hey guys, thanks for your

Post by paul25g »

Hey guys, thanks for your help, I really appreciate it!

Found the following on Vech's parts site so looks like the 6.5 gallon tank did use a different bolt:

07 11 9 912 537--$2.50--hex bolt shanked front tank 6.5 gallon 8x1.25x70mm SS

Daves79x
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You Can

Post by Daves79x »

If you are really looking for originality and don't want stainless, search for a right-side transmission-engine mount bolt and nut. Preferably with a 14mm head, which is correct for your bike. Then Dremmel off a few mm (can't remember, but it isn't much) to get to 70mm. Dress the bolt end to a factory look and have it plated - black is correct for your bike, but don't know if you are making any fasteners black.

Dave
Dave

maddrobh
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Re: R60 Front Fuel Tank Mount Bolt?

Post by maddrobh »

Glad I searched on this...answered my question, I think. I also have the Schorsch Meir Sport tank on my '66 R69S.

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vechorik1373
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Re: R60 Front Fuel Tank Mount Bolt?

Post by vechorik1373 »

The part number for the correct bolt for the 6.5 gallon tank is 07 11 9 912 536. It is supposed to be 65mm long.
When I owned Bench Mark Works, we kept it in stock but it appears to have been dropped from the inventory of Max BMW.
Vech
Technical Adviser, Former owner, Bench Mark Works
662 312 2838 cell 9 am to 4pm CST PLEASE!

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