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Harmonic Balancer Install
11-23-2013, 10:23 AM (This post was last modified: 11-23-2013 10:25 AM by cferry7.)
Post: #1
Harmonic Balancer Install
How ("The Old Way") to install the Harmonic Balancer on a 4.3L 6 cylinder GMC Engine ?
Is their a Alternate Method.
Can you tap it lightly / continually/ surroundingly with a hammer and Large Deep Well Socket surrounding the crank and touching the Balancer ?

The last time I used the Harmonic Balancer Install and Removal Tool
( following instructions to the T ) - I had a difficult time removing the Tool's Bolt's Assy. after the install.
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11-23-2013, 12:06 PM
Post: #2
RE: Harmonic Balancer Install
Yes, you can tap the balancer into place but the same space limitations with the special tool apply so there's limited room to swing a hammer while it's in the vehicle. Of course there's the options on some to disassemble the pulley from the hub to make it easier, then bolt it all together later. Just make sure you have the timing marks in the right place as you may need them at a future date. (yes, that part can go several ways so mark it)

Here's what I do: Check the mating surfaces for scratches and buggers, lightly file or sand as necessary. Clean the surface and put a coat of motor oil on both the crank and hub then start it by hand. You can push it far enough to know the keyway is in the right place before letting fly with the BMF tool. When your wrist is tired from all of those small taps try to start the center bolt by hand. If you can catch a half inch of thread then you can draw it up with a wrench. Less than that you risk tearing up the threads.

Hint#1: those "half moon" keys can walk out of their slot so keep an eye on that before using too much force. Use a mirror and a light to inspect if necessary.

Hint #2: If you took the pulley off then you have the option to install a few of the smaller bolts so you have points to lever against for the final torque of the center bolt. Recalling that's about 70 ft lbs.

Have fun and let us know how you make out.
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12-04-2013, 06:45 PM
Post: #3
RE: Harmonic Balancer Install
Thanks !
Harmonic Balancer went on OK with repetitive hammering ! Took quite a while !
Went through two small pieces of 2 X 4 then converted to a very very large diameter steel socket which I purchased - Medium size Mallet / Regular size handled hammer and Rubber Mallet.
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12-04-2013, 08:37 PM (This post was last modified: 12-04-2013 08:40 PM by Garner.)
Post: #4
RE: Harmonic Balancer Install
Thanks for the update. Rupe is taking a couple of days off but I’m sure he’ll be pleased to see that his advice helped you out.

Stop back anytime.

Thanks for using the forum,

Interested in Mining? Look here: Coal Mining, PA
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