flywheel bolt torque lbs.
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Junior User
Joined: Nov 2005
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From: columbia river gorge
flywheel bolt torque lbs.
What is the correct torque lbs on the flywheel to crank flange. What are the threads, the bolts check out to be 10mm x 150 not 3/8 -16 n.c.. I am swaping my E40D for a zf5 and bought a s/m flywheel conversion from CMI Industries through NAPA, almost everything comes from China. The package says they are certified to ISO 9001:2000. The instructions say to torque their supplied bolts( six lines mean grade 8, correct) to 45 - 49 lbs. Three out of the nine would not even go to 40 before they seemed to get easier to turn, I removed them and got replacements from NAPA. Again four would not torque past 40, one even was cracked, luckily I stopped in time and removed it. The original bolts are 1/4" too short. The ones from NAPA are stamped rockwell. Thanks for any help.
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Joined: Mar 2005
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From: KY
A 10mm by 1.5 10.9 is 45lbs a 12.9 is 49 lbs.
I would get another torque wrench. A 3/8 grade 8 shouldn't be stretching at 45 lbs. No matter who makes the fastener, the ANSI standard on a grade 8 bolt is 150,000 lbs tensel strength.
Are they bottoming out? Any bolt will break pretty easily then.
I would try to find you another wrench to try. They will get out of wack. I have mine checked once a year unless they start acting funny thens it's sooner. Also if it is a spring tension style wrench, twist the handle and tighten a main spring up in the handle, and they sit around with pressure on them they will get messed up. That is a big no-no.
I would get another torque wrench. A 3/8 grade 8 shouldn't be stretching at 45 lbs. No matter who makes the fastener, the ANSI standard on a grade 8 bolt is 150,000 lbs tensel strength.
Are they bottoming out? Any bolt will break pretty easily then.
I would try to find you another wrench to try. They will get out of wack. I have mine checked once a year unless they start acting funny thens it's sooner. Also if it is a spring tension style wrench, twist the handle and tighten a main spring up in the handle, and they sit around with pressure on them they will get messed up. That is a big no-no.
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