What size is the Harmonic Balancer Bolt? - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 12-25-2004, 12:16 AM   #21
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Yep, this is true. Isn't it because people beat on them?


-justin
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Old 12-25-2004, 12:28 AM   #22
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Usually it'* because some people use them as breaker bars.
These are precision instruments.
You must always store a torque wrench backed off to 0.
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Old 12-26-2004, 04:01 PM   #23
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1 1/8 thats the size socket that best fit the Harmonic Balancer bolt on a 1988 Vin "C" engine. I tried a 28mm ( to small) 29mm (looser than the SAE 1 1/. So I guess I will try busting it loose with the 1 1/8 SAE. if any body knows any different please chime in. Thanks for all the replies.
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Old 12-26-2004, 11:42 PM   #24
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Are there two different balancer bolts ? Just checked my '88 C 3800 and it takes a 15/16" (24 mm might fit but is a touch larger) the same as the 90 "C" and 92 "L". These are all believed to be stock.

According to the parts book the bolt is a 3/4-16, 2.73" long for the "C", 3.10" for the "L". See grp 0.662 so would expect SAE (inch) wrenches to fit.

And just for *&G I just checked a high-milage (balancer likely to have been replaced) '88 "C" and that bolt is different - 1 1/8" socket fits properly - so possibky a replacement.
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Old 01-18-2005, 04:41 PM   #25
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Yikes!! just went to the GM parts dealer in town and they are asking $ 23.00 bucks for the 1 1/8" (TTY) harmonic balancer bolt. Anybody know if I can use a 15/16/harmonic balancer bolt (no mention of TTY in manual in 90 manual) from the junk yard to replace this bolt.

Also inquired about the timing chain tensioner both dealer and Auto Zone asked if I had a chamfered or counterbored bolt hole. I want to get all the parts before teardown so I can get it right back on the road. Anybody know if an 88 C is defintly one of the above?

Anybody know of a cheaper source for some of these TTY bolts that fit our engine??

Mr. Goodwrench (Shaft) is wanting to get rich of these?

Thanks
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Old 01-18-2005, 05:12 PM   #26
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Believe the 88 has the small tensioner/guides and you really want to use the 89-later units. Can someone be more specific ?
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