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.

98 Bonneville head gasket

Old 05-12-2007, 11:01 PM
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Originally Posted by BonnevillesSince62
Almost forgot...this is about as good as a Chilton manual...

http://www.autozone.com/addVehicleId...leSelected.htm

Here'* what my $800 1997 SE looked like...




We need to hook up.
Old 05-13-2007, 10:44 AM
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I forgot to add that it had the white smoke out the back before they turned it off and it didn't start again.
Old 05-13-2007, 11:15 AM
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Keep in mind that if the coolant stays in the crankcase for a period of time, it will rust out the rod bearings and destroy the motor. This has happened several times with our members.

You MUST drain the oil pan immediately after symptoms start, then change the oil shortly after repair/restart again.

This is a big risk of losing the motor.
Old 05-13-2007, 12:05 PM
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That is what I am concerned with. It has been about a month since the car last cranked, and two weeks since I was told about it. I just picked it up yesterday. I am tempted to just have another Series II put in it. What do you think?
Old 05-13-2007, 01:12 PM
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No matter what L36 you are intending to use, if you want it to last, you need to install the aluminum frame LIM gaskets, a UIM with a heat shield for the EGR bore, and a reduced diameter stovepipe. Those parts, including the UIM and TB gaskets can all be recycled to a replacement Series II engine if the original engine is found to have bearing damage.

Therefore, the only real gamble is on the labor involved to effect the repairs. And, if the experience of members here on BC is typical, there is a better than 50/50 chance that the original engine can be saved.
Old 05-13-2007, 09:01 PM
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I'm gonna give it a go and put in the new parts even though it sat like this for 6 months... the engine only has 110K the body is in mint condition the inside is good. new suspension and tires. and all for free! just this UIM LIM gasket thingy....


BUT how do I crank the engine manually I cant figure it out..... help would be appreciated!!!
Old 05-13-2007, 09:42 PM
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Originally Posted by jumackey
BUT how do I crank the engine manually I cant figure it out..... help would be appreciated!!!
Pull the spark plugs, remove the serpentine belt to make it even easier, put a big socket on the crank bolt, get you a big handle on the socket and turn.
Old 05-13-2007, 09:56 PM
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Well as for my Bonneville, I am not going to put any faith in this engine. I found out this is the second time it has failed. I am considering putting in supercharged 3800. I have my eye on one now out of a 98 Rivera. What else to I need to get this to work?
Old 05-13-2007, 09:58 PM
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I would lean towards replacing the engine. It may very well save you time and money in the long run, but you still need the APN intake and Aluminum LIM gaskets for the new motor.
Old 05-15-2007, 12:20 AM
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thanks for the help. the engine turns over with ease by manually cranking it. so thats a good sign I suppose. now I just ordered the APN UIM. But maybe i'm blind but is there a website that I can order a aluminum LIM gasket? Or do I have to go to a pontiac dealership directly? I'm ordered new copper spark plugs and the 180 Tstat. anything else I should do or check or replace since everything is already apart? I was thinking maybe new fuel injectors?

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