Tightening down the bolt on harmonic balancer - The 1947 - Present Chevrolet & GMC Truck Message Board Network

skokie · 08-10-2007, 10:06 PM

Whats a good way to tighten down the bolt on the balancer? The engine is in the truck.

Thanks

Longhorn Man · 08-10-2007, 10:26 PM

turning it clockwise.

OLDIRON69 · 08-10-2007, 10:29 PM

I use a 2x4 and a BFH to drive it on, then torque the bolt down.

Southedisto · 08-10-2007, 10:55 PM

I used the installer after the 2x4 trick went awry the last time. As for the bolt, try a strap wrench on the balancer and tq the bolt. Or impact gun.

*Shane* · 08-10-2007, 11:36 PM

be careful ... they WILL strip ... don't ask me how i know ...

66skylarkpost · 08-10-2007, 11:57 PM

buy or make an installer !! driving it on with a hammer will only destroy the main bearings . i made one from welding a damper bolt to a piece of 3/4" threaded rod . lube up a stack of washers and take your time . as for the torque on the bolt , never use and ipact to install it , its fine threaded and you can easily strip it out .only tighten it when you know the balkancer is fully seated .most stock bolts are not very long and only grab a few to several threads especialy with aftermarket pulleys .with the pulley bolted, take a pick or scribe ,feel the threads and measure to get the longest bolt you can use . places like napa , ace or fastenal can get you the grade 8 fine threaded 7/16" bolt . ive gained up to 1/4" - 3/8" of threads .ived saved a couple motors where the threads have been stripped out and the crank was thought to be ruined .

70GMCer · 08-11-2007, 06:58 AM

Quote:

Originally Posted by Shane

be careful ... they WILL strip ... don't ask me how i know ...

Also, careful......they WILL break off....and don't ask ME how I know......

Mechdawg · 08-11-2007, 07:16 AM

speaking of stripped.....lol found out mine is anyone got any suggestions on the next size up tap and bolt I should use?

jlaird · 12-25-2008, 08:11 PM

what's the torque spec on the bolt?

08-10-2007, 10:06 PM	#1
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,354	Tightening down the bolt on harmonic balancer Whats a good way to tighten down the bolt on the balancer? The engine is in the truck. Thanks __________________ RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234

08-10-2007, 10:26 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Tightening down the bolt on harmonic balancer turning it clockwise.

08-10-2007, 10:29 PM	#3
OLDIRON69 Registered User Join Date: Mar 2007 Location: Ben Wheeler,Texas Posts: 992	Re: Tightening down the bolt on harmonic balancer I use a 2x4 and a BFH to drive it on, then torque the bolt down. __________________ 05 2500HD 6.0 excab 69 LWB-Gone but not forgotten! 68 Dodge Charger 383/727 69 Dodge Charger-440/4spd

08-10-2007, 10:55 PM	#4
Southedisto River life...... Join Date: Oct 2005 Location: Soldotna AK Posts: 1,078	Re: Tightening down the bolt on harmonic balancer I used the installer after the 2x4 trick went awry the last time. As for the bolt, try a strap wrench on the balancer and tq the bolt. Or impact gun. __________________ I like wheelin in Dixie!

08-10-2007, 11:36 PM	#5
Shane Account Suspended Join Date: Jun 2000 Location: over yonder Posts: 14,270	Re: Tightening down the bolt on harmonic balancer be careful ... they WILL strip ... don't ask me how i know ...

08-10-2007, 11:57 PM	#6
66skylarkpost Registered User Join Date: Mar 2006 Location: kearney,nebraska Posts: 443	Re: Tightening down the bolt on harmonic balancer buy or make an installer !! driving it on with a hammer will only destroy the main bearings . i made one from welding a damper bolt to a piece of 3/4" threaded rod . lube up a stack of washers and take your time . as for the torque on the bolt , never use and ipact to install it , its fine threaded and you can easily strip it out .only tighten it when you know the balkancer is fully seated .most stock bolts are not very long and only grab a few to several threads especialy with aftermarket pulleys .with the pulley bolted, take a pick or scribe ,feel the threads and measure to get the longest bolt you can use . places like napa , ace or fastenal can get you the grade 8 fine threaded 7/16" bolt . ive gained up to 1/4" - 3/8" of threads .ived saved a couple motors where the threads have been stripped out and the crank was thought to be ruined . __________________ '70 k-10 longbox- mid 70's drivetrain 350/350 487x heads 10.1:1 flowmasters ,35's 3.73's auburn posi ,rear shackle flip. '72 short stepside U.S. forestry truck, '73 455 buick,400 turbo,dropped 2"-4 1/4" ,3.07 posi,:'89 silverado 1500 ,OK truck ,5.7 holley tbi ,trick 700r4 3.07 auburn posi ,and my '66 skylark ,'73 centurion and my '84 monte carlo imca stock car Last edited by 66skylarkpost; 08-11-2007 at 12:04 AM.

08-11-2007, 07:16 AM	#8
Mechdawg Registered User Join Date: Jul 2002 Location: Dover AFB Delaware Posts: 159	Re: Tightening down the bolt on harmonic balancer speaking of stripped.....lol found out mine is anyone got any suggestions on the next size up tap and bolt I should use?

12-25-2008, 08:11 PM	#9
jlaird Senior Member Join Date: May 2004 Location: johnstown, NY Posts: 2,393	Re: Tightening down the bolt on harmonic balancer what's the torque spec on the bolt?



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