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C5 Harmonic balancer wobbling!



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Vetteheadtony

Club Member

Fri 23 Mar 18 09:30

C5 Harmonic balancer wobbling!


So after going out last week and getting that dreaded chirping sound coming from the front of the engine, now after changing the belt last year I new it couldnít be that!
Looking around with the motor running and my can of WD40 in hand I looked down and saw my bottom pulley/balancer wobbling, another C5 woe.
OK this car isnít going anywhere now until this is done!!
I go on RockAuto and for a genuine GM balancer and bolt with shipping and discounts £70, bargain or what? ( my taxi one cost £200 over the counter).
Today the first bit came, the bolt in it GM wrapping.
Now to start stripping it down, anyone tackled this and has any advise???
Image


--------------------
Vetteheadtony
2004 Z06 lemans edition pro charged
613 BHP
Black C6 ZR1 wheels
FECKING FAST!!!

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Le Vette

Regional Rep

Fri 23 Mar 18 10:55

Re: C5 Harmonic balancer wobbling!


Did mine very recently Tony. There are some things you need to know before doing it!
Read this... Good luck! Not an easy job.

http://www.corvetteclub.org.uk/viewtopic.php?t=18878&pos... Doh


--------------------
Peter Sansbury
CCCUK International Rep


May the Force be Quite a Long Way Behind You

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Le Vette

Regional Rep

Fri 23 Mar 18 11:02

Re: C5 Harmonic balancer wobbling!


The moral of my tale is that when you disconnect the steering column from the steering rack you must tie the steering wheel to the shifter or fix it in another way to stop it rotating. Then put the rack back on and ensure it goes back in exactly the same position it was in when you disconnected it. If you do that it'll be fine, although loosening and tightening that massive bolt is another challenge!
Good luck...


--------------------
Peter Sansbury
CCCUK International Rep


May the Force be Quite a Long Way Behind You

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roppa440

Club Member

Fri 23 Mar 18 16:28

Re: C5 Harmonic balancer wobbling!


When I took my steering column out to replace the steering position sensor I Just marked the steering shaft and was careful taking it out, storing it, and putting it back in.

But then again I'm working on my own car and took the time to read the service manual. owning a copy of the manual is pretty important. You can also pick up good tips off Youtube.

£70 is a bargain for a damper. I have a very tight (non-existent really) budget so always look for a cheaper option.

However I refuse to skimp on some things. A damper has a LOT of stored energy in it. I have seen the damage one breaking free of the engine can do. Which is why I would never fit anything other than a SFI rated one.

Don't mean to piss on your parade and I am sure your £70 GM one will be fine for years until it goes the same as the original. But personally I would have advised this one;

https://www.summitracing.com/int/parts/sum-c2501/overview/

And you need one of these too;

https://www.summitracing.com/int/parts/sum-900135/overview/

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Vetteheadtony

Club Member

Fri 23 Mar 18 23:01

Re: C5 Harmonic balancer wobbling!


roppa440 wrote (View Post):When I took my steering column out to replace the steering position sensor I Just marked the steering shaft and was careful taking it out, storing it, and putting it back in.

But then again I'm working on my own car and took the time to read the service manual. owning a copy of the manual is pretty important. You can also pick up good tips off Youtube.

£70 is a bargain for a damper. I have a very tight (non-existent really) budget so always look for a cheaper option.

However I refuse to skimp on some things. A damper has a LOT of stored energy in it. I have seen the damage one breaking free of the engine can do. Which is why I would never fit anything other than a SFI rated one.

Don't mean to piss on your parade and I am sure your £70 GM one will be fine for years until it goes the same as the original. But personally I would have advised this one;

https://www.summitracing.com/int/parts/sum-c2501/overview/



And you need one of these too;

https://www.summitracing.com/int/parts/sum-900135/overview/



Did think about going after market but I will probably be selling the Z06 soonish and just thought the original one lasted 14 yrs and 40,000 miles so probably good enough.


--------------------
Vetteheadtony
2004 Z06 lemans edition pro charged
613 BHP
Black C6 ZR1 wheels
FECKING FAST!!!

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Vetteheadtony

Club Member

Fri 23 Mar 18 23:08

Re: C5 Harmonic balancer wobbling!


Le Vette wrote (View Post):Did mine very recently Tony. There are some things you need to know before doing it!
Read this... Good luck! Not an easy job.

http://www.corvetteclub.org.uk/viewtopic.php?t=18878&postday... Doh

Thanks Pete, I will tie the steering wheel and mark spline, I do have a tech 2 now so if I get in trouble hopefully this will help Thumbs up


--------------------
Vetteheadtony
2004 Z06 lemans edition pro charged
613 BHP
Black C6 ZR1 wheels
FECKING FAST!!!

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BlackZeD

Club Member

Sat 24 Mar 18 19:24

Re: C5 Harmonic balancer wobbling!


A lot if not all people who change the pulley pin it to the crank if the car is Supercharged, must be to do with the extra load on it.
I wouldn't think an OEM one would last too long under those conditions.


--------------------
Don't take life too seriously, after all, your not coming out of it alive.

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roppa440

Club Member

Mon 26 Mar 18 08:34

Re: C5 Harmonic balancer wobbling!


BlackZeD wrote (View Post):A lot if not all people who change the pulley pin it to the crank if the car is Supercharged, must be to do with the extra load on it.
I wouldn't think an OEM one would last too long under those conditions.


Yes a belt driven supercharger puts a heavy load on the pulley and damper (which is just a press fit to the crank after all) so a pin or keyway is essential.

The old yank engines always had a keyway on the end of the crank for safety. But they don't seem to be bothered about the chance of the damper slipping on modern engines these days.

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Vetteheadtony

Club Member

Mon 26 Mar 18 09:56

Re: C5 Harmonic balancer wobbling!


I do agree guys but seeing as it only runs at 5psi of boost and it has lasted 14yrs and done 43,000 miles on the standard one Also that I will probably put her up for sale this year I thought the GM one will be ok 👍🏻



Last edited by Vetteheadtony on Mon 26 Mar 18 09:57; edited 1 time in total. [1 %]
--------------------
Vetteheadtony
2004 Z06 lemans edition pro charged
613 BHP
Black C6 ZR1 wheels
FECKING FAST!!!

Reply with quote

therabster

New Comer

Sat 08 Dec 18 22:02

Re: C5 Harmonic balancer wobbling!


I have just done mine on my C6 at 14000 miles only. I had just got 300 miles into a 1000 mile journey , slowed down a little on the motorway and heard the chirping noise. I guessed immediately it was the balancer and my heart sunk. Had to take it easy the rest of the way on quite an empty motorway with no speed limits. Really frustrating.

To change is really not as daunting as you might first think but you just need to follow a certain procedure and have the right tools.Everything is quite accesible not like working on European crap. Anybody needing any advice can always post me.

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