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7 Series - E38 (1995 - 2001)

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  #1  
Old 02-13-2019, 02:42 PM
DasBimr DasBimr is offline
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E38 Crank Bolt.

I canít get my crank bolt off, I have tried everything, Iíve broken 4 breaker bars, recently moved to a 3/4 inch Snap On bar and socket with 4ft extension and penetrating oil. It hasnít broken yet but now Iíve bent my crank pulley tool because of the excessive force Iíve had to use. This is un-real to me. What am I doing wrong? What are my options here? I need to get this thing off ASAP. I have tried an automotive grade impact as well. Iím at my wits end.


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  #2  
Old 02-13-2019, 04:50 PM
u.nanimous u.nanimous is offline
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Which way are you trying to turn it?

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2005 Venture Extended LT - what else you gonna drive when you have 6 kids, cargo and still want better than 10MPG
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2000 Impala LS - RIP 12/23/2016, officially totaled by insurance company
2001 330xiA - fXtXeX/son project - now April's car
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Old 02-13-2019, 07:43 PM
DasBimr DasBimr is offline
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Lefty loosey, Righty tightey


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  #4  
Old 02-14-2019, 09:06 AM
u.nanimous u.nanimous is offline
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Got room for a 6' extension?
Maybe try a different penetrating oil and let it soak in overnight? Not a lot of room to do it (especially with an extension) but I like to use the weight of the car to do the work sometimes, if you could get a jack under the breaker bar to put some stress on it while it soaks overnight (this will take planning so if it comes loose the car won't drop on the jack and break something).

And this is why they call it the Jesus bolt.

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2005 Venture Extended LT - what else you gonna drive when you have 6 kids, cargo and still want better than 10MPG
1999 740iA - long term project/summer DD
2000 Impala LS - RIP 12/23/2016, officially totaled by insurance company
2001 330xiA - fXtXeX/son project - now April's car
2008 335xiA - winterbeater Impala replacement
2002 530i/5 - 2.5 years searching...and it is John's car
1989 535i/5 - the spare car
2002 325xiA - to be Charlotte's when she gets her license (?2019?)

Last edited by u.nanimous; 02-14-2019 at 09:35 AM.
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  #5  
Old 02-14-2019, 02:48 PM
oldroller oldroller is offline
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I used a 6 foot pipe on a 3/4" breaker bar to break the initial torque. Still took a bit of force with the crank holder
securely wedged under the left frame rail.
You could also try heating the hub with a propane torch (NOT an acetylene torch!) evenly, then give it a go.
Replace the crank seal.... you're doing that anyway.
If it doesn't break loose, let it cool and try again. They can be stubborn, for sure.
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Old 02-14-2019, 04:37 PM
DasBimr DasBimr is offline
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I appreciate you guys- going over tomorrow to try these Iíll let ya know how it pans out


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  #7  
Old 02-15-2019, 08:25 PM
DasBimr DasBimr is offline
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Update: I have let penetrating oil soak for a few days, heated it and then let my jack down to let the weight of the car do the work for me. Nothing so far. About ready to cut this thing off. Month 3 of this bolt issue is creeping up on me.


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  #8  
Old 02-17-2019, 08:21 PM
Bimmer-joe Bimmer-joe is offline
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I'm sure this is way to late for Dasbimr but for everyone else. I just found a tool called a Torque Multiplier. They come in varying ratios, could be 3 or 4 to 1. So if you put 100 FT LB of torque on your breaker bar you get 300 to 400 FT LB's of torque to the bolt. It worked so well.
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Old 02-19-2019, 12:32 PM
DasBimr DasBimr is offline
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What brand did you buy? @bimmer-joe


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  #10  
Old 02-19-2019, 01:31 PM
Bimmer-joe Bimmer-joe is offline
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Crank Bolt

I have a friend who has a tug boat business. I borrowed his. He has 2 that go back to back. He torques bolts up to 2400 FT LB's. They run $200 to $300 so perhaps a rental. It did work very well. Because of the time line I'm assuming you got your crank bolt off. I used the torque multiplier on my 2nd 740i. On the first I used an air impact gun. The things you learn by need. My impact gun was a 450 Ft Lb's at 100 psi gun. Did nothing. My friend had a gun that was 850 FT LB's at 100 psi, did nothing. Another friend had a 1250 FT LB impact gun that he claimed his son had modified? increased the air flow inside the impact gun. It took off the bolt. When I started I had no idea the spread on FT LB's was so great on impact guns. I did have my radiator out AC condenser still installed an there was just enough room to make this work.

PS, I don't know what you did to hold your motor from turning over. But I made a flat adapter plate that mounted on the crank stub after you take off the belt drive. Ran an arm off to one side and added a leg to the garage floor. no turn. Turned it around the other direction when putting the bolt back on.

I would be interested in your progress
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  #11  
Old 07-11-2019, 04:01 PM
DasBimr DasBimr is offline
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Hey thanks, I got the car running about a month and a half ago. Rebuilt and installed a used motor and transmission. With about 95k miles on each. Crank bolt never came off and i actually cracked the pulley housing that the pulley attaches to around the crank bolt and bent my holder tool. So that was a really fun job lol. Cars up and running with the exception to the sound system, see my new post for that lol!


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