Harmonic Balancer
Thread Starter
Heel & Toe
Joined: Oct 2021
Posts: 17
Likes: 1
From: Sweden
Harmonic Balancer
Hi!
I need help determing if my HB is bad.
I suspected that I had a misfire, but it might be vibration instead.
I checked the HB and have attached a film
In my eyes itīs bad, but what do you think?
C6 2005 Auto
46.000 miles....
Thankful for feedback.
//Mats
I need help determing if my HB is bad.
I suspected that I had a misfire, but it might be vibration instead.
I checked the HB and have attached a film
In my eyes itīs bad, but what do you think?
C6 2005 Auto
46.000 miles....
Thankful for feedback.
//Mats
Popular Reply
Dec 15, 2021, 09:08 AM
Le Mans Master
Joined: Jul 2010
Posts: 6,013
Likes: 726
My best advice is when you start saying F**k and motherf**Ker stop walk away and have a beer. If you dont u will end up striping bolts and nuts and finally break things.
Ask me how i know.
Ask me how i know.
Burning Brakes
Joined: Apr 2019
Posts: 808
Likes: 286
From: Johns Creek, Georgia
I don't need to look at the video, if it is wobbling, if it is original, change it. I have an 2005 m6 and had to change mine right around the same mileage you have now.
I'm told it is not a difficult job if so if you want to save money and you are capable, do it. I paid $850, parts and labor, for the fix about 18 months ago
Good Luck.
I'm told it is not a difficult job if so if you want to save money and you are capable, do it. I paid $850, parts and labor, for the fix about 18 months ago
Good Luck.
Race Director
Joined: Sep 2003
Posts: 16,838
Likes: 341
From: Database Error Indiana
Could be the most common problem on these cars. I have 70 threads per page on CF and going back 12 pages in tech there is a balancer thread on nearly every page. Some pages more than one. I replaced a squeaky belt last week and 2 days later it was squeaking again. I just ordered a balancer.
Race Director
Joined: Aug 1999
Posts: 11,123
Likes: 673
From: SE Pennsylvania
St. Jude Donor '03 thru '26
Oldtimer
The HB on my 07 started wobbling at 21K miles ? Different stokes for different folks ? I was told many of the HB weren't installed correctly at the factory and their the ones that started the early wobbling ? Just what I was told ? 
Cost $1800.00 to replace.
Cost $1800.00 to replace.
Thread Starter
Heel & Toe
Joined: Oct 2021
Posts: 17
Likes: 1
From: Sweden
Thanks for confirming!
Tips on which HB to buy - best value for money. No performance, only standard.
So HB, bolt, belts and seal. Anything else I need?
And is it possible to change the HB from above, or is it more work?
// Mats
Tips on which HB to buy - best value for money. No performance, only standard.
So HB, bolt, belts and seal. Anything else I need?
And is it possible to change the HB from above, or is it more work?
// Mats
Instructor
Joined: Jun 2021
Posts: 129
Likes: 71
From: Wiesbaden, Germany
Yup, it is bad. I used the Summit Pulley, which cost $200. Single one-piece unit. You also need two tensioners, idler pulley, belts, oil seal behind HB, and stock bolt or ARP. Recommended that you pin it since you are in there anyway.
You cannot change it from above. The PS rack has to come out to change it. Not easy, but not super complicated, just takes a long time.
You cannot change it from above. The PS rack has to come out to change it. Not easy, but not super complicated, just takes a long time.
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Melting Slicks
Joined: Sep 2021
Posts: 2,555
Likes: 1,213
Thread Starter
Heel & Toe
Joined: Oct 2021
Posts: 17
Likes: 1
From: Sweden
I have started to dismantle and have removed the PS rack. The worst thing was the pipes on the PS rack, and the brakelines. Not alot of space and the wrong tools for the PS lines. Had to make my own from a 18 mm socket, and a piece of solid iron bar. Cut the socket open to get it on the pipe. Welded the bar on the socket and that worked :-). I have ordered a Power Bond HB.
And yes, sometimes you have to leave the garage, and have a beer or something.
Thanks to all that have replied!
Merry Christmas to all!
And yes, sometimes you have to leave the garage, and have a beer or something.
Thanks to all that have replied!
Merry Christmas to all!
Pro
Joined: Feb 2021
Posts: 729
Likes: 317
From: Ashevile, NC
Did my '05 with 35K miles recently. Wobbled just like yours. Not a terrible project just time consuming. And yes, the PS hoses are a bitch! Power Bond is the one I used, plus the ARP bolt. Absolutely do the front seal (easy to do) while you have the balancer out. Might think about the idler pulleys too (I didn't do mine), and be sure to do new belts as they're easy and cheap. Top off the PS fluid when you're done too. Install the new balancer with the old bolt until the balancer bottoms. Remove the old bolt, install the new one and torque it to 240 ft. pounds. Think you said you have an automatic, which means you'll have to get a flywheel stop tool. Remove the starter, install the stop tool, then torque the bolt. Unless you're going to add a super charger don't bother with pinning the HB, proper torque is all that's needed. You'll find you probably can't pull the torque wrench to 240 alone unless you're a big guy!! Get some help and/or use a piece of pipe over the torque wrench handle to add some leverage. Once you're torqued in and belts back on things start to move a lot more quickly!
Thread Starter
Heel & Toe
Joined: Oct 2021
Posts: 17
Likes: 1
From: Sweden
Did my '05 with 35K miles recently. Wobbled just like yours. Not a terrible project just time consuming. And yes, the PS hoses are a bitch! Power Bond is the one I used, plus the ARP bolt. Absolutely do the front seal (easy to do) while you have the balancer out. Might think about the idler pulleys too (I didn't do mine), and be sure to do new belts as they're easy and cheap. Top off the PS fluid when you're done too. Install the new balancer with the old bolt until the balancer bottoms. Remove the old bolt, install the new one and torque it to 240 ft. pounds. Think you said you have an automatic, which means you'll have to get a flywheel stop tool. Remove the starter, install the stop tool, then torque the bolt. Unless you're going to add a super charger don't bother with pinning the HB, proper torque is all that's needed. You'll find you probably can't pull the torque wrench to 240 alone unless you're a big guy!! Get some help and/or use a piece of pipe over the torque wrench handle to add some leverage. Once you're torqued in and belts back on things start to move a lot more quickly!
I have planned to do exactly as you write :-)
New belts, seal, HB, bolt, but not change the pulleys. They run fine and no noise when spinning.
Iīm not pinning the HB. Overkill for me.
I have bought tool for removing and installing the HB, and also a flywheel stop tool.
Borrowed a torque tool, but found out that it maxed out att 150 ft. So I have to see were to find another bigger tool..
Waiting for the delivery on all above, as I live outside U.S.
All the best
// Mats
Instructor
Joined: Jun 2021
Posts: 129
Likes: 71
From: Wiesbaden, Germany
I pinned my pulley since I was in there. Adds maybe an hour to the job but a safe piece of mind. You just have to remove the radiator fan, two bolts and it slides out.
I used a new stock bolt, 37ftpounds, and a 140-degree turn. That turn is stressful, feels like something is going to break.
I used a new stock bolt, 37ftpounds, and a 140-degree turn. That turn is stressful, feels like something is going to break.
Thread Starter
Heel & Toe
Joined: Oct 2021
Posts: 17
Likes: 1
From: Sweden
Did my '05 with 35K miles recently. Wobbled just like yours. Not a terrible project just time consuming. And yes, the PS hoses are a bitch! Power Bond is the one I used, plus the ARP bolt. Absolutely do the front seal (easy to do) while you have the balancer out. Might think about the idler pulleys too (I didn't do mine), and be sure to do new belts as they're easy and cheap. Top off the PS fluid when you're done too. Install the new balancer with the old bolt until the balancer bottoms. Remove the old bolt, install the new one and torque it to 240 ft. pounds. Think you said you have an automatic, which means you'll have to get a flywheel stop tool. Remove the starter, install the stop tool, then torque the bolt. Unless you're going to add a super charger don't bother with pinning the HB, proper torque is all that's needed. You'll find you probably can't pull the torque wrench to 240 alone unless you're a big guy!! Get some help and/or use a piece of pipe over the torque wrench handle to add some leverage. Once you're torqued in and belts back on things start to move a lot more quickly!
Did not reach 240 ft, but 220. I guess that its enough. It must all be about getting the HB seated properly. And its seated 😄
Thank you to all who have replied in the post.
Have a good one!