ARP harmonic balancer bolt
Team Owner
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From: At the beach in little Rhody
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From: American Canyon Lethal Injection
Last edited by SLPRC5; Nov 13, 2007 at 09:40 PM.
Team Owner
Joined: Mar 1999
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From: At the beach in little Rhody
There are also a number of guys who have tightened this bolt to 250 lb-ft based on the ls1howto instructions not realizing that bolt stretch is based on many things other than torque, poor guys ended up replacing crankshafts or trying to drill out the pieces. If you want to use 235, feel free. If I were in your shoes, since you don't want to believe what several have told you here, call ARP again. This time ask for the head of tech.
Last edited by vettenuts; Nov 14, 2007 at 07:22 AM.
Thread Starter
Drifting
Joined: Sep 2006
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From: st.louis mo.
Yes I have, several times. We use their fasteners in many of our experimental projects at work. I have installed several of these particular bolts, have you???
There are also a number of guys who have tightened this bolt to 250 lb-ft based on the ls1howto instructions not realizing that bolt stretch is based on many things other than torque, poor guys ended up replacing crankshafts or trying to drill out the pieces. If you want to use 235, feel free. If I were in your shoes, since you don't want to believe what several have told you here, call ARP again. This time ask for the head of tech.
There are also a number of guys who have tightened this bolt to 250 lb-ft based on the ls1howto instructions not realizing that bolt stretch is based on many things other than torque, poor guys ended up replacing crankshafts or trying to drill out the pieces. If you want to use 235, feel free. If I were in your shoes, since you don't want to believe what several have told you here, call ARP again. This time ask for the head of tech.
Team Owner
Joined: Mar 1999
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From: At the beach in little Rhody
Yes, follow the GM procedure until you get to the part about installing the new bolt. Don't lube the crank threads when you use the old bolt, or you will need to decrease the torque value accordingly. Lube the ARP bolt, washer and head when you install and run it in and out by hand a couple of times to lube the threads.
Thread Starter
Drifting
Joined: Sep 2006
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From: st.louis mo.
Yes, follow the GM procedure until you get to the part about installing the new bolt. Don't lube the crank threads when you use the old bolt, or you will need to decrease the torque value accordingly. Lube the ARP bolt, washer and head when you install and run it in and out by hand a couple of times to lube the threads.
Melting Slicks
Joined: Mar 2001
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From: Worden Illinois
Breaking that bolt in the crankshaft would not be good!
Team Owner
Joined: Mar 1999
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From: At the beach in little Rhody
Yes, as long as you use their lube (in bold in the instructions). That lube didn't exist when this thread was started. Not sure if there weren't other changes to the bolt itself, only ARP would know that. Torque is used to measure bolt preload/stretch, so changing the lubricant changes the friction and changes the torque value used to measure. Friction is the most important factor in accurate bolt preload determinate when using torque as the measuring tool.
Last edited by vettenuts; Apr 26, 2018 at 07:38 AM.
