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ted von Kampen · Posted: Wed Nov 02, 2016 4:48 am Post subject: crankshaft bolt

After several days of working, O finally got the crankshaft bolt off my 924 2liter (1981). I tried several methods, including an air impact wrench that would not work. Finally resorted to making a tool that bolted to the cam belt pulley (6 holes) and using an impact 24mm socket with about a 4 foot leverage bar (ie-pipe over breaker bar). With about all the strength I could muster I finally loosened the bolt. Which brings me to my question. The Haynes book says the torque spec on this bolt is 180 ft-lbs. Does it really need to be that tight? Your experienced based comments are welcomed. Thanks, Ted

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

180 isn't that tight...it wasn't torque that made it hard to remove.
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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

ted von Kampen · Posted: Thu Nov 03, 2016 1:44 am Post subject: Crank bolt

Thanks for the comment. What do you think made it that tight? I have seen and heard forum comments that the crankshaft bolt is often very tight. Other engines I have rebuilt are on the order of a 100 ft-lbs or so.

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

Seizing through corrosion and/or dissimilar metal bonding.

To hit 180 you only have to pull 90 lbs on a two foot breaker. Like I said, not that tight.
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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

924RACR · Posted: Thu Nov 03, 2016 3:21 am Post subject:

The 2.0L motor is known to have some ridiculous levels of vibration, is probably why...

I go with 180ft-lbs plus red loctite.
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