Harmonic Balancer gone bad?
Thread Starter
Burning Brakes
Joined: Jun 2012
Posts: 888
Likes: 41
From: Atlanta GA
Harmonic Balancer gone bad?
Well seems like my 05 is in need of a new Harmonic Balancer.
I would like to get this taken care of as soon as possible; already placed an order for an ARP bolt.
I'm curious to know what other parts are needed when replacing the HB.
Can someone supply me with a shopping list?
Thanks in advance.
I would like to get this taken care of as soon as possible; already placed an order for an ARP bolt.
I'm curious to know what other parts are needed when replacing the HB.
Can someone supply me with a shopping list?
Thanks in advance.
Safety Car
Joined: May 2016
Posts: 4,616
Likes: 1,808
From: Erlanger, Kentucky
If you are doing is yourself, you will need:
1. New bolt; GM or ARP.
2. New balancer; I recommend Dayco or ATI.
3. New front cover seal for balancer.
4. Balancer install tool; Summit sells a very nice one.
5. Balancer puller.
6. Flywheel locking tool.
Probably a good idea to get some engine coolant as well.
It's not a difficult job, just a lot of work mainly to get everything out of the way to get to the balancer.
1. New bolt; GM or ARP.
2. New balancer; I recommend Dayco or ATI.
3. New front cover seal for balancer.
4. Balancer install tool; Summit sells a very nice one.
5. Balancer puller.
6. Flywheel locking tool.
Probably a good idea to get some engine coolant as well.
It's not a difficult job, just a lot of work mainly to get everything out of the way to get to the balancer.
Le Mans Master
Joined: Dec 2004
Posts: 5,486
Likes: 800
From: West coast CA
Get a friction washer, P/N 12674588. It goes behind the pulley. If you have an early production '05, there's a chance you don't have one. If you do, it's probably the old style with a rubber lip around the edge. It will usually come out attached to the pulley. Just make sure there's only one of them in there before you install the new pulley.
Le Mans Master
Joined: Dec 2004
Posts: 5,486
Likes: 800
From: West coast CA
It involves drilling a hole through your pulley into your crankshaft and inserting a pin to prevent rotation. No naturally-aspirated C6 was made with a pinned crank and the vast majority never spun a pulley. In my opinion, most of the spun pulleys you hear about are either 1) early '05s, or 2) replacement pulleys that were torqued incorrectly. The torque procedure is critical and can be difficult to do in the available space. I think it gets screwed up a lot.
Pinning is recommended if placing extra load on the pulley like with a supercharger, or if your pulley has spun before. Some owners do it as an insurance policy.
Race Director
Joined: Sep 1999
Posts: 12,425
Likes: 908
From: CONCORD NC
Many of us have seen pulleys spin that were installed correctly, although not common in a regular street car. If a shop is doing it, they should know how to pin in. There are multiple methods, either will work.
I have the ATI pin kit, I always use their method.
I have the ATI pin kit, I always use their method.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)
Joe Kucinski
Racer
Joined: Sep 2001
Posts: 363
Likes: 93
From: Chesterfield VA
This is a common issue on the LS motors. It the cheap balancers, you can go back with a GM one but I would used a ATI balancer. You don't need to pin the crank though unless you are planning on supercharging your engine. If you are going to do that then you need to pin it. ATI sells a pin kit as well but when you buy your supercharger it should come as part of the kit.
Safety Car
Joined: May 2016
Posts: 4,616
Likes: 1,808
From: Erlanger, Kentucky
Thread Starter
Burning Brakes
Joined: Jun 2012
Posts: 888
Likes: 41
From: Atlanta GA
On another note, look what came in so far:
Thread Starter
Burning Brakes
Joined: Jun 2012
Posts: 888
Likes: 41
From: Atlanta GA
Decided to post this as a reference for anyone that may need this in the near future:
ATI 918993: Crank Pin Drill Fixture Kit LS1/LS2 - JEGS
ATI 918993: Crank Pin Drill Fixture Kit LS1/LS2 - JEGS
Racer
Joined: Sep 2001
Posts: 363
Likes: 93
From: Chesterfield VA