Harmonic Balancer?

Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's, Olds 98 91-96, Buick Lesabres and Park Avenue 91-96. Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.
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tytotheler92
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Year and Trim: 1998 Oldsmobile 88 LS

Harmonic Balancer?

Post by tytotheler92 »

Hey all,

So I drove the 88 some distance for the first time and I noticed right when it changes from 1st to 2nd gear I get a rattling noise and a vibration from the passenger side. I assume this is the Harmonic Balancer telling me its getting a bit long in the tooth? I understand that this is a common issue.

At first I thought it was a CV but it does it going straight and during turns, and always around 2k-2500 RPM. If I drive more like an a$$hat It doesn't make the noise at all. :lol: It goes all the way up to 60 with no vibrations or noises.

The car drives absolutely beautiful other than that, so I do hope it not Transmission/Differential related.
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1999 Oldsmobile 88 Base....it has power windows and locks! Second rescue, might flip...Click HERE for project thread.

1998 Oldsmobile 88 LS w/ FE1 Float Suspension, Leather and Power Everything - Totaled (Rolled!) out during Winter of 2015 by Sister Click HERE for project thread.

2002.5 Blazer - Stock Stuffing 30s, SLP ZR1 Replicas, Dynomax Catback, TONS of other mods. Click HERE for project thread. - DD
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RJolly87
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Year and Trim: 1993 Buick Park Avenue
1994 Buick Regal Custom
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Re: Harmonic Balancer?

Post by RJolly87 »

The harmonic balancer usually presents itself at idle. Is it possible to grab a vid?

Also remember the torque axis mount is in that neighborhood too, and can show problems with age, or if its not bolted together and correctly
~Randall~
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1993 Buick Park Avenue - 197k - Some odds and ends done - Simply won't die
1994 Buick Regal - 78k - Bone stock - Always ready for a good kicking
1990 Oldsmobile 88 - Gone to a better place
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tytotheler92
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Joined: Tue Apr 15, 2014 2:27 pm
Year and Trim: 1998 Oldsmobile 88 LS

Re: Harmonic Balancer?

Post by tytotheler92 »

Not right now but I can. Like I said it always presents itself around 2k when it shifts from 1st to 2nd. Never any other time. I was thinking it could be a motor mount too....The thing is quiet when in park and revved and at idle.

Is the axis mount that mount that I had to take apart when I replaced the serpentine belt?

I was thinking that was a *dang* good possibility myself. It looks loose.
Image

1999 Oldsmobile 88 Base....it has power windows and locks! Second rescue, might flip...Click HERE for project thread.

1998 Oldsmobile 88 LS w/ FE1 Float Suspension, Leather and Power Everything - Totaled (Rolled!) out during Winter of 2015 by Sister Click HERE for project thread.

2002.5 Blazer - Stock Stuffing 30s, SLP ZR1 Replicas, Dynomax Catback, TONS of other mods. Click HERE for project thread. - DD
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RJolly87
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Posts: 5403
Joined: Tue May 27, 2008 8:53 am
Year and Trim: 1993 Buick Park Avenue
1994 Buick Regal Custom
Location: Las Cruces, NM

Re: Harmonic Balancer?

Post by RJolly87 »

That sounds like the one.
~Randall~
ImageImage

1993 Buick Park Avenue - 197k - Some odds and ends done - Simply won't die
1994 Buick Regal - 78k - Bone stock - Always ready for a good kicking
1990 Oldsmobile 88 - Gone to a better place
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tytotheler92
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Posts: 132
Joined: Tue Apr 15, 2014 2:27 pm
Year and Trim: 1998 Oldsmobile 88 LS

Re: Harmonic Balancer?

Post by tytotheler92 »

https://www.youtube.com/watch?v=4vpx5EJ ... e=youtu.be

Pretty sure the Axis motor mount is roached. :lol:
Image

1999 Oldsmobile 88 Base....it has power windows and locks! Second rescue, might flip...Click HERE for project thread.

1998 Oldsmobile 88 LS w/ FE1 Float Suspension, Leather and Power Everything - Totaled (Rolled!) out during Winter of 2015 by Sister Click HERE for project thread.

2002.5 Blazer - Stock Stuffing 30s, SLP ZR1 Replicas, Dynomax Catback, TONS of other mods. Click HERE for project thread. - DD
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RJolly87
Certified Bonneville Nut
Certified Bonneville Nut
Posts: 5403
Joined: Tue May 27, 2008 8:53 am
Year and Trim: 1993 Buick Park Avenue
1994 Buick Regal Custom
Location: Las Cruces, NM

Re: Harmonic Balancer?

Post by RJolly87 »

Hah, well that can't be helping at all. May be a good idea to check the other two mounts. That one is normally the last to go.
~Randall~
ImageImage

1993 Buick Park Avenue - 197k - Some odds and ends done - Simply won't die
1994 Buick Regal - 78k - Bone stock - Always ready for a good kicking
1990 Oldsmobile 88 - Gone to a better place
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tytotheler92
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Posts: 132
Joined: Tue Apr 15, 2014 2:27 pm
Year and Trim: 1998 Oldsmobile 88 LS

Re: Harmonic Balancer?

Post by tytotheler92 »

Haha. Where are the other mounts? Can I take a look at them without jacking the car up?
Image

1999 Oldsmobile 88 Base....it has power windows and locks! Second rescue, might flip...Click HERE for project thread.

1998 Oldsmobile 88 LS w/ FE1 Float Suspension, Leather and Power Everything - Totaled (Rolled!) out during Winter of 2015 by Sister Click HERE for project thread.

2002.5 Blazer - Stock Stuffing 30s, SLP ZR1 Replicas, Dynomax Catback, TONS of other mods. Click HERE for project thread. - DD
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99BonnevilleSE
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Re: Harmonic Balancer?

Post by 99BonnevilleSE »

I'm dealing with same issue right now. Weird enough I just started doing some research on it today. I'm thinking it could be that shock absorber mount.
I'm backkkkkkkkkkkkkkkkk!
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tytotheler92
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Joined: Tue Apr 15, 2014 2:27 pm
Year and Trim: 1998 Oldsmobile 88 LS

Re: Harmonic Balancer?

Post by tytotheler92 »

Keep me updated on what you find. Is there one dog bone mount, or two?
Image

1999 Oldsmobile 88 Base....it has power windows and locks! Second rescue, might flip...Click HERE for project thread.

1998 Oldsmobile 88 LS w/ FE1 Float Suspension, Leather and Power Everything - Totaled (Rolled!) out during Winter of 2015 by Sister Click HERE for project thread.

2002.5 Blazer - Stock Stuffing 30s, SLP ZR1 Replicas, Dynomax Catback, TONS of other mods. Click HERE for project thread. - DD
nickdalzell1
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Year and Trim: '92 Bonneville SSE

Re: Harmonic Balancer?

Post by nickdalzell1 »

Harmonic balancer knock is horrific and sounds like your engine is about to explode. Embarrassing in traffic.

If you have it, with the engine off, you should be able to rotate the accessory belt easily back and forth freely too.
1992 Pontiac Bonneville SSE (3800 Series I, 277K miles and counting! with a horrific knock sadly)
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tytotheler92
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Posts: 132
Joined: Tue Apr 15, 2014 2:27 pm
Year and Trim: 1998 Oldsmobile 88 LS

Re: Harmonic Balancer?

Post by tytotheler92 »

No, I don't think its the Harmonic Balancer anymore.

I created another thread, but here is the noise with a video.

https://www.youtube.com/watch?v=SX4pM-t ... e=youtu.be
Image

1999 Oldsmobile 88 Base....it has power windows and locks! Second rescue, might flip...Click HERE for project thread.

1998 Oldsmobile 88 LS w/ FE1 Float Suspension, Leather and Power Everything - Totaled (Rolled!) out during Winter of 2015 by Sister Click HERE for project thread.

2002.5 Blazer - Stock Stuffing 30s, SLP ZR1 Replicas, Dynomax Catback, TONS of other mods. Click HERE for project thread. - DD
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