Help ..Crank bolt torque spec ?
Thread Starter
Pro
Joined: Nov 2006
Posts: 608
Likes: 1
From: Lindenwold New Jersey
Help ..Crank bolt torque spec ?
In the morning Iam drilling my crank to pin it for my supercharger and was wondering what is the spec for the torque on the crank bolt ? and yes I bought a new bolt. better safe then sorry 
Thanks in advance for any insight you can give me.
Phil
Thanks in advance for any insight you can give me.Phil
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
Tighten old bolt to 240 lb-ft. Remove old bolt. Measure depth of crank snout from pulley hub. Install new bolt, tighten to 37 lb-ft. Rotate another 140 degrees after it is tightened to 37 lb-ft using an angle meter. There is no torque value, it is tightened to a predetermined rotation to obtain the correct bolt stretch.
Last edited by vettenuts; Feb 15, 2008 at 06:35 PM.
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
I am assuming you are not removing the pulley to do this, otherwise the new one is fully pressed on prior to installing the old bolt. Don't install the pulley with the old bolt. Hope this makes sense.
Tech Contributor
Joined: Jan 2007
Posts: 19,239
Likes: 1,091
From: Dyer, IN
Tighten old bolt to 240 lb-ft. Remove old bolt. Measure depth of crank snout from pulley hub. Install new bolt, tighten to 37 lb-ft. Rotate another 140 degrees after it is tightened to 37 lb-ft using an angle meter. There is no torque value, it is tighten to a predetermine rotation to obtain the correct bolt stretch.
