Seized Engine.....first post - 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 06-12-2004, 01:36 AM   #1
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Hey all....This is my first post but i have been reading you guys posts since i got my bonnie, back in september.

Well here is the problem...

1992 SSEi
180,000

(two months ago)

I was driving along about two months ago, a little over 100mph it was late (past 1 am) am she was acting really bad, she kinda bogged down. the i went in a rest stop she cut off and wouldn't start back up. I got a coffe, ate some M&Ms and tries again , she started back up. About ten milles later she was doing it again but this time she was cutting off on the highway, i put her in nutreul and started it up, went ahead and she wouldn't go over 65, then the revs started to drop. So i let off the gas and very politely, she locked up doing 50....

I always had the oil changed at 3000miles, and the radiator is full. I did see a LOT of oil running down the front of the engine, down the exuast manifold. Maybe a valve cover gasket?


(A week ago)

She had been sitting for a month, i was at a loss. I read about the deisel fuel thing, and i did that. Waited about 5 days, used a breaer bar to move the crank, and she actually turned over for like 5 minutes, then she locked up again!!!

(Now)

Should i have drained the deisel out, and filled it with oil? or waited longer? What to do next?

:(
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Old 06-12-2004, 01:47 AM   #2
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hold on........you put diesel fuel where?
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Old 06-12-2004, 01:49 AM   #3
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where you put the oil.....



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Old 06-12-2004, 01:53 AM   #4
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What the hell? I never heard of that before. Your gonna need some help quick. Le tme pm some people.......
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Old 06-12-2004, 02:13 AM   #5
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ok...why did you put diesel instead of oil?

Something tells me oil and diesel dont mix?
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Old 06-12-2004, 02:32 AM   #6
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Hmm, before I got to the diesel part, that is what happened to me as my transmission was going out. Be driving and it would die on me.
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Old 06-12-2004, 03:44 AM   #7
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Engine locked up, but could be turned over later? I am not familiar with the diesel fix. What is that supposed to do? And there was oil coming down the exhaust manifolds.

What your car did reminds me very much of when my 85 Buick Somerset melted a hole through a piston for the second time. The blowby caused really high pressure in the oil pan, and forced the oil into the valve covers. The engine siezed because of the debris in the oil.

My thoughts are right now, and they are just thoughts, you might need a rebuilt engine. Not rebuild yours, but get an entirely different engine. The debris would have destroyed the block.
BTW, this would be the first time I've heard of this with a 3800.
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Old 06-12-2004, 02:13 PM   #8
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I like John'* diagnosis. It makes alot of sense. FYI, using diesel to free up a seized engine is done after it'* sat for a long time, not when it'* seized mechanically due to a catastrophic failure. You sound like you've also shot some crank bearings.

I'll go with the new engine. Next time it actually starts (might as well, the damage is already done), take your oil cap off and tell us what you observe. Any odd noise or compressed air escaping? What does the oil on your dipstick look like? Both before starting and after?
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Old 06-13-2004, 11:51 AM   #9
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Quote:
Originally Posted by willwren
I like John'* diagnosis. It makes alot of sense. FYI, using diesel to free up a seized engine is done after it'* sat for a long time, not when it'* seized mechanically due to a catastrophic failure. You sound like you've also shot some crank bearings.
I have to agree here: after all it'* been through, this engine is probably toast, and at this point you'd find a better candidate for rebuilding by walking through a Bonneville junkyard blindfolded and picking out an engine by pointing at one randomly.

In any event, this thing'* going to need some exploratory surgery just to figure out what failed in the first place. I wouldn't worry too much about the Diesel fuel in the oil; a couple of short-term oil-and-filter changes will correct that. (e.g. Change, drive 50 miles, change again.) The more serious problem is why the engine won't stay running without seizing up, and from the sound of things, it may need all new bearings throughout.

In other words, a junkyard engine that'* seized up from old age will do that because its pistons have rusted to the cylinder walls; that'* why the Diesel oil trick (squirted into the cylinders, that is, not poured into the crankcase) might free it up. But yours apparently seized for other reasons, such as bearing failure or (maybe) cylinders going dry and ripping up the rings, but in neither case will a change of oil help; a teardown will be needed. And given the recent history of this engine, I wouldn't necessarily put _this_ one back in after it comes out. Your call.
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