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Old 12-13-2010, 06:01 AM   eBay Motors  #1 (permalink)
 
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Question Coolant Leak

A buddy at work has a coolant leak that seems to be coming from around the oil pan gasket on the drivers side of the engine. He cleaned everything up and can see exactly where it is coming from and swears it is at the pan gasket. Not sure of the model, lb7 I think.

Sounds odd to me but thought I would throw it out there to see if anyone had anything they could offer up.
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Old 12-13-2010, 06:08 AM   eBay Motors  #2 (permalink)
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probably coming from the overflow and against the side of the block running down. head gaskets probably pooched pressurizing the system
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Old 12-13-2010, 06:09 AM   eBay Motors  #3 (permalink)
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scratch that you said drivers side haha. gotta learn to read i guess
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Old 12-13-2010, 10:03 AM   eBay Motors  #4 (permalink)
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Before assuming head gaskets, thoroughly check everything else out. There is a tube going from the back of the water pump back to the oil cooler area. Mine was not leaking but since I was doing injectors, head gaskets, water pump etc., I decided to pull the tube and replace the o ring. Big mistake as when we re-installed the tube, we cut the o ring. We got everything back together, started it up and the water just poured out! We had to pull the water pump and loosen the motor mount to get the new o ring in without cutting it again. Being that the leak appears to be at the pan gasket area, it could very well be this tube/o ring thats leaking.....

Coolant lines across the top of the engine can leak also, with the water running back along the valley and down the back of the head surface. On my leaking head gasket, it was very obvious when under the truck looking up at the rear head mating surface that it was leaking at the mating surface itself and not water coming down the valley.

Head gaskets are a B$tch to do, rule everything else out first!
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Old 12-13-2010, 04:10 PM   eBay Motors  #5 (permalink)
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hey 5akman sounds like I have the same issue as you. I have coolant seapage on the back of the drivers side head where the block meets the head. Not bad yet ive been watching it all summer. Does it sound like the same thing as you?
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Old 12-13-2010, 04:38 PM   eBay Motors  #6 (permalink)
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Goodi8650. Exactly! I thoroughly dug around the top of the engine, praying that it was a leaky coolant line or something. No luck, it was confined just to the mating line between the head and block. It was interesting in that I never did have an upper radiator hose that over pressurized or stayed hard like they tend to do. I did have coolant lose from the tank and a whitish tinge to the exhaust.
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2001 CC/LB/2wd, Modded stock air box, 4" MagnaFlow exhaust, Replaced at 147K: injectors, head gaskets, water pump, CP3. Mike L Stage III tranny with ML converter and valve body, Aeromotive lift pump, EFI Live by Trent Nell, 285/75/16's on Eagle rims, 6" RCD lift kit with about 3" removed!
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Old 12-14-2010, 05:20 PM   eBay Motors  #7 (permalink)
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Thank you! Not what I wanted to hear but now I know im not the only one. I had pressure in the cooling system after it sat but it went away when I replaced the reservoir cap. I should have kept my 8.1 gasser!
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Old 12-14-2010, 08:02 PM   eBay Motors  #8 (permalink)
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Goodi,
I'd take a diesel any day over a gasser, especially a 8.1! Replace the head gaskets and injectors and you'll have a dependable ride.
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2001 CC/LB/2wd, Modded stock air box, 4" MagnaFlow exhaust, Replaced at 147K: injectors, head gaskets, water pump, CP3. Mike L Stage III tranny with ML converter and valve body, Aeromotive lift pump, EFI Live by Trent Nell, 285/75/16's on Eagle rims, 6" RCD lift kit with about 3" removed!
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