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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Sun, Apr-07-2019, 05:33:44 PM   #1
JitteryJoe
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Default crankshaft stretch bolt - how to get 300 lbs

Anyone have a good way to get 300 lbs. of torque on the crankshaft end bolt? I don't think my clutch is slipping but I cannot seem to get enough twist.
I have the rear wheels on the ground. The frontend & radiator is off the car so I have room. I have a sprung clutch disk so there is some slack to use up.

Thoughts?

Thanks,
--Joe
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Old Sun, Apr-07-2019, 06:42:56 PM   #2
Braymond141
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Default Re: crankshaft stretch bolt - how to get 300 lbs

I use a thick flat bar with two hub mounting holes drilled in it and a notch rounded into it to match the hub curve. Two 12.9 bolts and the tool pushing off the hub is enough to hold torque removing and installing. You can get a full 6 bolt holder if you really need to.

Having a way to hold the crank from the front hub is the proper way to do it.
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Old Sun, Apr-07-2019, 08:05:14 PM   #3
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Default Re: crankshaft stretch bolt - how to get 300 lbs

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Originally Posted by Braymond141 View Post
I use a thick flat bar with two hub mounting holes drilled in it and a notch rounded into it to match the hub curve. Two 12.9 bolts and the tool pushing off the hub is enough to hold torque removing and installing. You can get a full 6 bolt holder if you really need to.

Having a way to hold the crank from the front hub is the proper way to do it.
Thanks Brett. I'm now looking for a locking tool online. I see there are quite a few for various BMW engines. Looking for the M52 version.
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Old Sun, Apr-07-2019, 08:10:25 PM   #4
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Default Re: crankshaft stretch bolt - how to get 300 lbs

If you have a fun clutch tool, you can probably use it (the water pump holder tool). Bolt it on, slide your jack handle over it. May require drilling the holes out.
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Old Sun, Apr-07-2019, 09:43:08 PM   #5
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Default Re: crankshaft stretch bolt - how to get 300 lbs

Looks like Sir Tools makes one for the M52. I'll give them a call Monday and see if they will ship me one.
Thanks for the help.
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Old Sun, Apr-07-2019, 10:50:34 PM   #6
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Default Re: crankshaft stretch bolt - how to get 300 lbs

Flywheel locking pin? Wedging a big screwdriver between crank trigger gear and AC bracket? Angle iron drilled and bolted to crank pulley bolt holes and long enough to hit the ground and not move while you tighten? Unless the special tool is cheap or you plan to do this job more often, I would not buy a special tool. I have never used one and I have done the job half a dozen times.
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Old Sun, Apr-07-2019, 11:16:24 PM   #7
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Default Re: crankshaft stretch bolt - how to get 300 lbs

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Originally Posted by pbonsalb View Post
Flywheel locking pin? Wedging a big screwdriver between crank trigger gear and AC bracket? Angle iron drilled and bolted to crank pulley bolt holes and long enough to hit the ground and not move while you tighten? Unless the special tool is cheap or you plan to do this job more often, I would not buy a special tool. I have never used one and I have done the job half a dozen times.
With my current luck, I'd break a tooth on the FW or trigger gear.
I'll add the tool to my expanding yet used very infrequently specialty tool set. I'll keep it right next to the BMW front wheel bearing tool and transmission shift pin drift tools.
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Old Sun, Apr-28-2019, 12:05:08 AM   #8
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Default Re: crankshaft stretch bolt - how to get 300 lbs

Just want to wrap up this thread. I picked up a crank counter holder from Baum. I tried to order from SIR Tools only to find out (after some chasing around) that they got taken out by the California fires last year (sadness). The Baum tool is a nice piece but more expensive than SIR. There is an additional adapter plate needed for the M52.



Bolted in place. Use strong bolts as you'll be putting a lot of stress on them to get to 300 lbs. and there are only 3 bolts rather than the usual 6. Also make sure they are not too long or you'll run them into the oil seal.

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Old Wed, May-01-2019, 12:13:41 AM   #9
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Default Re: crankshaft stretch bolt - how to get 300 lbs

nice work! I just got a piece of flat iron (2"x2ft i believe) then just did what Bray said. Cost about $10 and 30minutes to make.
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Old Wed, May-01-2019, 02:36:52 AM   #10
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Default Re: crankshaft stretch bolt - how to get 300 lbs

I like that idea. Have not needed a special tool, though, in 5-6 crank hub changes.
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Discussing crankshaft stretch bolt - how to get 300 lbs in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)