Converting foot pounds + 140 degrees - Pontiac GTO Forum
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post #1 of 15 (permalink) Old 07-30-2010, 04:31 PM Thread Starter
 
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Converting foot pounds + 140 degrees

Hey all is there a way to convert 37 foot pounds and final pass at 140 degrees. could I make a mark on the bolt once at say 12 O'clock once its at 37 foot pounds and figure what another 140 degrees would be. This is to install the harmonic balancer. ---------Danfigg
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post #2 of 15 (permalink) Old 07-30-2010, 04:56 PM
 
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Harmonic dampner is 240 ft lbs. It's nearly impossable to get that 140 degrees with the engine in the car.



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post #3 of 15 (permalink) Old 07-30-2010, 05:14 PM
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90* is a quarter turn, 180* is a half a turn, so 140* would be almost half a turn.

I hate it when they use 'XX' of a turn for torque specs.
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post #4 of 15 (permalink) Old 07-30-2010, 06:33 PM
 
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I forgot to ask. Did you get a new bolt? Its a TTY bolt.



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post #5 of 15 (permalink) Old 07-30-2010, 11:28 PM
 
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Quote:
Originally Posted by danfigg View Post
Hey all is there a way to convert 37 foot pounds and final pass at 140 degrees. could I make a mark on the bolt once at say 12 O'clock once its at 37 foot pounds and figure what another 140 degrees would be. This is to install the harmonic balancer. ---------Danfigg
If that's the torque spec, (140 degrees past 37 ft/lbs) sounds odd but don't mark the bolt. Instead, after you hit 37 ft/lbs make a mark that corresponds to one point of the 6 point bolt hex... rotation of each flat past that mark equals 60 degrees, so your going to go almost 2 1/2 flats (2 points and almost mid way to the 3rd point) for 140 degrees.

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post #6 of 15 (permalink) Old 07-31-2010, 12:55 AM
 
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This method seems flawed to me. They say this is more accurate than
a torque setting, BUT their starting point is a TORQUE SETTING???

Larry

2005 GTO Quick - 1984 Honda V65 Magna Quicker - 2004 Z06 Quickest
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post #7 of 15 (permalink) Old 07-31-2010, 09:58 AM
 
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This method seems flawed to me. They say this is more accurate than
a torque setting, BUT their starting point is a TORQUE SETTING???

Larry


GM does this with all the TTY bolts. I bought a torque angle meter and haven't used it once. I use Rukee's methed when I torque them. I'm not sure if the torque setting seats the bolt then the addentional degrees is the one the sets the bolt and calculates for bolt stretch.



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post #8 of 15 (permalink) Old 07-31-2010, 10:04 AM
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MOPAR does it too, it baffles me why they can't put a pound # on the final torque.
It's like some smuck was in the factory assembling the motors and when asked what he torqued them to he just went ...."Doh I dunno, I just cranked them like this far after they were kinda tight".
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post #9 of 15 (permalink) Old 07-31-2010, 10:23 AM Thread Starter
 
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re

Yes I have a new GM bolt and no its not 240 ft pounds. But that is strange that You can't reuse the old bolt but you can use the old bolt to seat the New balancer and torque it to 240 ft pounds to assure its seated properly. The reason I thought of using 12 oclock as the spot for a mark on the bolt would be to make it easier to judge 140 degrees from the 12 o clock position. So I think you would actually have to mark the socket at 12 oclock so you can see the movement and make a mark somewhere to show where you have to stop.Rukee sounds like you got it so I will go with your method. Even if I went a little more than 140 degrees the fact that the old bolt is torqued to 240 ft pounds to seat the balancer in the first place, I dont see any harm if im off a few degrees.---danfigg
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post #10 of 15 (permalink) Old 07-31-2010, 10:33 AM
 
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I used 240ft lbs on the old and new bolt. I think I've done this before. And yes I have the service manual. The balancer is pressed fit without a keyway, have you seen damage a balancer would do if it comes off, I have. I also have mine pinned to the crank something that GM should have done.



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