Crankshaft Bolt Torque
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Crankshaft Bolt Torque
I own a 1996 Honda Civic DX. Last week I broke the crankshaft bolt because I didn't have a torque wrench. I tightened it as tight as it would go and the bolt broke. I went to the dealer and bought a new bolt. The Haynes Manual says that the torque should be at 135 lbf-ft. However, the instructions that came with the bolt say that I should tighten it to 145 lbf-ft then loosent it fully. Then I'm suppose to tighten it to 20 lbf-ft then tighten by 60 degrees. Then I'm suppose to start the engine and let it idle for 3 minutes. Once that is done, I'm suppose to tighten the bolt by 30 degrees. Anyone have any experience with the crankshaft bolt?
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Joined: Dec 2011
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Re: Crankshaft Bolt Torque
Beg, borrow, or steal a torque wrench.
Beg, borrow, or steal an angle gauge.
Follow the directions that came with the new bolt.
Use the proper tools, do it right.
Beg, borrow, or steal an angle gauge.
Follow the directions that came with the new bolt.
Use the proper tools, do it right.
Re: Crankshaft Bolt Torque
It doesn't have to be exactly 60 degrees. I mean it's not really a "Specific" torque by any means. What I do is grab a permanent marker and mark a line on the bolt and pulley. Then I mark where 60 degrees is approximately. Turn the bolt until it reaches the 60 degree mark. That's if your lazy and don't want to go get an angle gauge.
If you think a good mechanic is expensive, try hiring a bad one
Joined: Dec 2011
Posts: 32,017
Likes: 256
From: Midwest. Aiming about mid-chest
Rep Power: 518 Re: Crankshaft Bolt Torque
Not sure why the instructions want you to run it for 3 minutes before tightening the last 30 degrees.
Seems to me that a TTY bolt doesn't give a darn, 90 degrees is still 90 degrees when it is over.
Totally agree with marking the bolt before turning it for the angle tightening part:
60 degrees is the distance between 2 points of a hexagon.
The other 30 deg. completes a quarter turn.
Sharpie or paint marks make this simple, no real angle gauge is needed if you know what you are doing.
But rookies normally can't appreciate all of this without going through the motions and understanding the process, doing it all properly -- at least one time.
I use a center punch to mark TTY head bolts.
Seems to me that a TTY bolt doesn't give a darn, 90 degrees is still 90 degrees when it is over.
Totally agree with marking the bolt before turning it for the angle tightening part:
60 degrees is the distance between 2 points of a hexagon.
The other 30 deg. completes a quarter turn.
Sharpie or paint marks make this simple, no real angle gauge is needed if you know what you are doing.
But rookies normally can't appreciate all of this without going through the motions and understanding the process, doing it all properly -- at least one time.
I use a center punch to mark TTY head bolts.
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