L27 engine failiure 145K - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 11-29-2006, 02:55 PM   #1
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Default L27 engine failiure 145K

What usually fails on the bottom end of a L27? My dad'* 93 Olds 88 with 145K has a loud knock coming from deep inside the motor. If he accelerated it would knock louder and seize up completely. It could be restarted though and again the knocking gets louder when reved. This confuses me as to why such a young 3800 is done so early?
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Old 11-29-2006, 02:57 PM   #2
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Bearings. Unless he got coolant in there (which isn't common like the L36) I'm surprised it went that soon too.
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Old 11-29-2006, 03:02 PM   #3
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His LIM gaskets most likely failed and gave out. A L27 shouldn't have crapped out that soon.
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Old 11-29-2006, 03:25 PM   #4
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Quote:
Originally Posted by bonnie94ssei
Bearings...
Rod bearing, most likely. Pull out the dip stick and look at the oil. It probably has pretty metal flakes in it. Not good. I'm thinking you have babbit material from one end of the engine to the other. I don't think I'd run it anymore unless you're going to junk it - you run the risk of damaging even more stuff.
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Old 11-29-2006, 03:36 PM   #5
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Default Re: L27 engine failiure 145K

Quote:
Originally Posted by fantastic88
If he accelerated it would knock louder and seize up completely. It could be restarted though and again the knocking gets louder when reved.
How could it be seized up completely if he was able to restart it?
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Old 11-29-2006, 03:44 PM   #6
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Quote:
How could it be seized up completely if he was able to restart it?
My bad. I ment that it would seize up when accelerating but could be restarted. There were no shavings on the dipstick. The engine was always rough on oil so it was almost black as usual.
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Old 11-29-2006, 04:45 PM   #7
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On my L67 S1, it failed at 175k due to thinning of oil when a coil pack went bad. You *should* pull the pan and take a look at what'* down there

How does the coolant look per chance?
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Old 11-29-2006, 04:49 PM   #8
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This means that the engine has spun a bearing.. Its not exactly common for the L27 to do this.. Now the question will be which bearing did it spin... Most likely if the engine is clean and not littered with shavings( if there are shavings forget I said this ) you could pull the motor and put a crank kit into it, making sure that the rod that spun the bearing is resized to be within tollerances if that rod hasn't been damaged..

Then in your case it may be cheaper to find a Low milage L27 whit a pretty clean crankcase...

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Old 11-29-2006, 10:58 PM   #9
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Quote:
Originally Posted by fantastic88
The engine was always rough on oil so it was almost black as usual.
That'* what did it right there; the used up black oil.
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Old 11-30-2006, 02:38 AM   #10
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i just had to put a new motor in my 92.....same symptoms.. it would have actually cost more to get a crank kit and rebuild the motor than to get a lower milage one from LKQ.



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