Torque Wrench Dilemma - Need Something That Will Do 325ft/lbs

danieldd · Jul 31, 2014

I've got a crankshaft bolt that requires 325ft/lbs of torque to achieve the BMW spec on my V12 engine. This is a one time use bolt, so I need to get it right the first time. Problem is I don't have one that goes up to 325ft/lbs. Mine only goes to 120ft/lbs. I can rent one that does 250ft/lbs max, but that is not quite enough.

Short of spending $500 for a torque wrench, does anybody have any ideas?

WhoWhatNow · Jul 31, 2014

Is the engine in the car? Can you have 108lbs 3 feet away from the bolt?

BAM its mitch · Jul 31, 2014

Torque multiplier. Used one regularly in the navy to torque nuts to 1000 ft/lbs by hand.

Pooch897 · Jul 31, 2014

Re: Torque Wrench Dilemma -

Check a local industrial tire shop. They might help you out.

danieldd · Jul 31, 2014

Industrial Tire Shop. Hmmmm. Good idea. Don't know if they'll loan it to me, but at least its worth a call..

Engine is on a stand, not in the car...

Trying to stand on a breaker bar while the engine is on an engine stand is probably going to be asking for trouble... Although I have thought of that.

Torque multiplier - haven't checked on that one. I don't have one and I don't know anybody that has one.

Too bad I can't reliably set an impact wrench for 325ft/lbs and use that......

edsauto · Jul 31, 2014

Use or make a adapter and this link, http://cncexpo.com/TorqueAdapter.aspx

Dan...

darwyn · Jul 31, 2014

Have you tried talking to BMW tech? You can probably work out a deal with one to help you out for a nominal fee.

danieldd · Jul 31, 2014

edsauto said:
Use or make a adapter and this link, http://cncexpo.com/TorqueAdapter.aspx

Dan...

Tried the calculation list in the link with different angles. Doesn't help my case...

Thanks though..

danieldd · Jul 31, 2014

darwyn said:
Have you tried talking to BMW tech? You can probably work out a deal with one to help you out for a nominal fee.

Been there, done that. BMW has a "no loan" policy. You would think that the money I spend on a weekly basis at their parts counter, they would give me a break on loaning me a tool - NOT!

CJCar · Jul 31, 2014

There's a few torque multipliers on ebay for somewhat cheap:

http://www.ebay.com/itm/X-4-torque-multiplier-/291179777710

http://www.ebay.com/itm/Vintage-The-X-4-Torque-Multiplier-Model-64-810-Armstrong-Bros-Tool-Co-/141361947699

lametec · Jul 31, 2014

If you have a welder: http://www.freeinfostuff.com/TorqueExtension/TorqueExtension.htm

lksdrinker · Jul 31, 2014

danieldd said:
Trying to stand on a breaker bar while the engine is on an engine stand is probably going to be asking for trouble... Although I have thought of that.

Using any method for that amount of torque with the engine on the stand is going to be tough! You'll probably want to create some sort of supports/crutches no matter what route you end up going.

As far as reaching that torque; If you dont have a friend who weighs 325 lbs you could always try and get some weights (like what a weightlifter would use; or even any material that you could find that adds up to the proper weight) and somehow attach the correct amount to a 1 foot long breaker bar.

BAM its mitch · Jul 31, 2014

Came across this while searching. http://www.autozone.com/autozone/ac...ter=4&itemIdentifier=191056_0_0_&target=shelf

It's in the loaner tool section. I'd head to autozone and ask about it. Of course you would have to put a deposit down, but it would be 0 cost in the long run.

kjbenner · Jul 31, 2014

danieldd said:
Tried the calculation list in the link with different angles. Doesn't help my case...

Thanks though..

It's not about the angle, it's about the extension to the torque wrench. You could put a hex bit socket on your torque wrench, and use a 0° offset box wrench as an extension.

Edit: here's a site with a diagram: http://firetrucksandequipment.tpub.com/TM-9-254/css/TM-9-254_91.htm

BillK · Jul 31, 2014

Daniel,
Which engine is it ? M70 ? M70 B56 ?

Freejack · Jul 31, 2014

What is that bolt holding onto the crankshaft that it requires 325 ftlbs?

Also if there are any good DIY Bimmer forums, I'd check there, as someone has to have encountered the same issue.

Jake

danieldd · Jul 31, 2014

BillK said:
Daniel,
Which engine is it ? M70 ? M70 B56 ?

M70 (1991 BMW 850i)...

BillK · Jul 31, 2014

Nice,
The reason I asked is that the M70 B50, B54 etc went to a different torque spec. They use a torque plus angle method. You might want to see if the bolt part number is the same, if so you might be able to use that spec and save from having to find a torque multiplier.

The newer spec is 100NM (about 75 lbft) plus 60 degrees plus an additional 60 degrees.

danieldd · Jul 31, 2014

BillK said:
Nice,
The reason I asked is that the M70 B50, B54 etc went to a different torque spec. They use a torque plus angle method. You might want to see if the bolt part number is the same, if so you might be able to use that spec and save from having to find a torque multiplier.

The newer spec is 100NM (about 75 lbft) plus 60 degrees plus an additional 60 degrees.

Bill -

I think you're on to something there! Its been too long since I looked this up. In my feeble mind I somehow got 325ft/lbs stuck in there. I just looked at this:

http://www.bmw-m.net/techdata/torq/bmw_torq.pdf

and you are correct. 100NM +60 degrees +60 degrees.

I don't need no stinkin big *** torque wrench after all! Thanks for getting me back on the right track...

Lord Vader · Jul 31, 2014

Daniel that is a nice engine! How do you like the V12? Are you doing an overhaul on it?

BillK · Jul 31, 2014

danieldd said:
I don't need no stinkin big *** torque wrench after all! Thanks for getting me back on the right track...

Any time ! I have all of the specs handy on my computer so I just figured I would look it up, glad I did

danieldd · Jul 31, 2014

Lord Vader said:
Daniel that is a nice engine! How do you like the V12? Are you doing an overhaul on it?

Thanks. The V12 is smooth as glass when they run right. You can balance a quarter on it when its running, they're that smooth....

I've been overhauling this thing for the past 12 months. That picture is about 2 months old. I've done alot since then. Next month I figure I'll be ready to put it and the transmission back in the car. Probably will take me to Fall before I have her ready to be let loose on the street...

1Garageman · Jul 31, 2014

I am subscribing to this! Please keep us posted with info and PICTURES!!!
What a great car!

Torque Wrench Dilemma - Need Something That Will Do 325ft/lbs

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