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Old 12-05-2006, 11:55 AM   #1
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Default Possible cracked heads....

Got a 99 Grand Prix with a 3800 "K" motor in my shop that ran hot. It was low on coolant so I topped it of and pressure tested the cooling system, has LIM leak. For ***** and giggles I ran it with the pressure tester on, the pressure rose pretty quick, probably has bad head gasket or head damage. To confirm this I tested it with a block tester. Sure enough, the tester fluid turned yellow, indicating exhaust gasses in the coolant. My thought is that he must have ran it pretty hot to damage something. There is no coolant/oil mixing, and when I tore the heads off the head gaskets looked OK. Im sending the heads off to be tested today. Ill post pics when I get home tonight.
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Old 12-05-2006, 12:01 PM   #2
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WOW! He must have ran it hot all the time! It'* actually pretty hard to crack the heads on a 3800, since my aunt ran hers almost dry for 5 miles, and she didn't know it!
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Old 12-05-2006, 12:03 PM   #3
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It would be the first for me to see that, also. But the block tester and the pressure tester dont lie!
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Old 12-05-2006, 12:05 PM   #4
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Quote:
Originally Posted by PEARL_JAM
It would be the first for me to see that, also. But the block tester and the pressure tester dont lie!
i have seen a S1 with Warped heads....
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Old 12-05-2006, 12:14 PM   #5
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Quote:
Originally Posted by 1993 SLE
Quote:
Originally Posted by PEARL_JAM
It would be the first for me to see that, also. But the block tester and the pressure tester dont lie!
i have seen a S1 with Warped heads....
Ya gotta run them hot to warp cast iron!!
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Old 12-05-2006, 06:37 PM   #6
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Quote:
WOW! He must have ran it hot all the time! It'* actually pretty hard to crack the heads on a 3800, since my aunt ran hers almost dry for 5 miles, and she didn't know it!
Out the 5bazzilion 3800S2 heads heads I've seen most have hairline cracks between the valaves. This is more commmon with the 96-early 98 heads tho.

To crack the heads anywhere else I would agree that its next to imposible..
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Old 12-05-2006, 07:22 PM   #7
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Quote:
Originally Posted by PEARL_JAM
Quote:
Originally Posted by 1993 SLE
Quote:
Originally Posted by PEARL_JAM
It would be the first for me to see that, also. But the block tester and the pressure tester dont lie!
i have seen a S1 with Warped heads....
Ya gotta run them hot to warp cast iron!!
Yes we saw that warp on the heads and thought WTF??? How the H*** do you warp a head like that... I will hazzard a guess and say that sucker was warped bad enough to have a .060-.080 gap when an opposite end was pressed on.... I'm sure Pat will agree with me... I have never seen a cast iron head warped that bad without cracking...

Pearl Jam, do let us know what you find... I'm betting on a cracked head..

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Old 12-05-2006, 10:56 PM   #8
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Here'* pics of the teardown:
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Heads should be sent hopefully out on Wed(our delivery/shuttle driver has been sick)
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Old 12-05-2006, 11:16 PM   #9
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wow the gaskets are bad
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Old 12-05-2006, 11:23 PM   #10
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Quote:
Originally Posted by 1993 SLE
wow the gaskets are bad
Yeah, the LIM gaskets were definatly leaking. They look like the original ones.
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