L27 Harmonic Balancer Install trix - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 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 and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 09-10-2009, 09:31 PM   #1
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Default L27 Harmonic Balancer Install trix

Ol' Bonnie blue is clanking something awful at idle...rev her up to about 1200 RPMs and she sounds and runs fine...since I already replaced the H20 pump, it smells like a pending HB replacement to me.

I've got a mechanic that has the tools to remove and replace the HB for $50...sounds like a deal to me...but he says that all you do is bolt it on and torque the BIG nut to 110# and you are through!!!
GAWD I hope he is right...

But I'll bet someone here is going to say:
"On a 92 Bonneville L27 the HB needs to be prepped, sized, gapped and installed just perfect or it won't ever start again"

Is anyone willing to share the 92 L27 Harmonic Balancer installation "SECRETS" with me...PLEASE??


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Old 09-11-2009, 07:34 AM   #2
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"On a 92 Bonneville L27 the HB needs to be prepped, sized, gapped and installed just perfect or it won't ever start again"
The bolts are a goofy small size to use with the puller, the sensor to my recollection does need to be spaced properly on that year ... $50 is the way I'd go in your shoes.
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