Blew head gasket? - Page 5 - 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 06-26-2005, 09:17 PM   #41
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I didn't think it was a problem because I didn't rebuild the engine, just pulled the heads and whatnot. But I know after this time, **** anything more than idling down the street .

However, I ALWAYS waited for the car to get up to temp, and stay up to temp before doing anything over 2000RPM.


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Old 06-26-2005, 09:19 PM   #42
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Ya you gotta give all the new gaskets and such time to "seat" and no parts to wear in a while before you start beefin' on her.
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Old 06-26-2005, 09:24 PM   #43
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alright, too late now. It could have very well been a mixture of everything.. head bolts not torqued down good, me being a typical teen driver, heads warped. Who knows. Won't know until I pull the heads, get 'em inspected and all that greatness. I'm thinking if I have the cash, I may have them chip off .010" from the heads.. even if they check out fine. May as well get 8.65:1.

This is where experience comes into play. This I have [just about] none of. And this is why you don't see teen veteran mechanics. They are all apart of the 'B-Team,' sadly :(


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Old 06-26-2005, 09:51 PM   #44
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Here are the instructions for the 91... 89 should be a bit diffrent..

tighten the head bolts to 35ft lbs in sequence,

rotate each bolt 130* in sequence

rotate the center 4 bolts and additional 30* in sequence

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Old 06-26-2005, 10:46 PM   #45
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Hmm.. i'm a complete idiot.. Really big freakin' idiot.

Nowhere does it say 100ft lbs. Haynes or FSM. FSM doesn't even give a final reading. Just like what you said. Haynes doesn't give a damn thing either. Wow, I really have no clue where I got 100ft lbs from. Well, that very well could have been what my problem was.


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Old 06-26-2005, 11:36 PM   #46
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My 88 manual gives some readings:
1) tighten bolts to 34 N/m(25 lb-ft) in sequence
2) tighten bolts 90 degrees in sequence
3) tighten bolts another 90 degrees in sequence
Should you reach 81 n/m (60 lb-ft) at any point, do not tighten the bolt further.

90 and 92 manuals have about the same drgrees of turn but do not have the "do not exceed".

Didn't I post this before ?
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Old 06-26-2005, 11:38 PM   #47
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Quote:
Originally Posted by padgett
My 88 manual gives some readings:
1) tighten bolts to 34 N/m(25 lb-ft) in sequence
2) tighten bolts 90 degrees in sequence
3) tighten bolts another 90 degrees in sequence
Should you reach 81 n/m (60 lb-ft) at any point, do not tighten the bolt further.

90 and 92 manuals have about the same drgrees of turn but do not have the "do not exceed".

Didn't I post this before ?
I believe that you have... Somewhere... I believe that 89 is the same as 88...

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Old 06-26-2005, 11:47 PM   #48
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padg: you sure that isn't for an LG3? That'* what Haynes says.. because my 89 doesn't say anything about overturning it. It'* exactly what jr said.

What would be a disadvantage to over torquing head bolts? by like.. 30-40ft lbs?


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Old 06-27-2005, 02:14 AM   #49
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Well they're TTY bolts, so they'll only take so much torque before they're over-stretched and they don't hold properly. A good way to do it is tighten in sequence: 25 lbs, 50 lbs, 75 lbs, then give them a good once over to make sure you got accurate readings. If the factory manual says 60, well then go 20-40-60. Just take them down even and smooth. I don't know what kind of a torque wrench you use, but i always use a dial gauge and it works the best.
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Old 06-27-2005, 09:02 AM   #50
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Just like Alec said..

These are torque to yeild bolts... They permantly strech and are only good for one use...

I'm pretty sure I did the outer bolts to 65 ft lbs and the center 4 to 70ft lbs.... I think these bolts will take just about 80ft lbs, but at that point and anything after they can strech and or break..

The next time you go through the whole deal, get a can of Acetone from the wal-mart or hardware store, that way you can get everything wiped off, and the block deck and heads will be free of even a fingerprint....

A good throttbody/Carb cleaner will have Acetone as well....

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