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Author Topic: Chevy 350 using water  (Read 1030 times)

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Offline Don P

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Chevy 350 using water
« on: March 26, 2017, 03:41:44 pm »
I dropped a crate 350 in my Silverado last year. The thermostat hung and it had pegged the temp gauge when I saw it. Much of the magic was gone. I started using water, not a lot but it was going somewhere and isn't leaking, then smelled antifreeze at the exhaust. The radiator makes foam with the cap off and revved. No geyser but it does foam up. The oil is clean and fine. So I crossed my fingers, bought a head gasket set and then did a compression check this morning so I'd know where to really look for a crack or blowout in the gasket. I'm running 180-182 psi in all cylinders... where am I blown?

Offline DelawhereJoe

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Re: Chevy 350 using water
« Reply #1 on: March 26, 2017, 04:17:43 pm »
Aluminum heads can warp quick, I used to have a land rover discovery II one of the cylinder sleeves slipped just enough to let exhaust gas into the cooling system but not coolant into the oil.
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Offline Ox

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Re: Chevy 350 using water
« Reply #2 on: March 26, 2017, 04:30:51 pm »
It could be a crack that opens up when hot, then closes when cool.  Unlike an exhaust manifold crack that usually quiets down when hot.  You may need to warm the engine up all the way, make sure you're foaming at the filler neck, then quick do your checks.  You might need to warm up again halfway through, who knows?  I sincerely wish you all the luck in the world - nothing sucks more than stuff like this happening.  You said it best that it took the magic right out.
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Offline coxy

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Re: Chevy 350 using water
« Reply #3 on: March 26, 2017, 08:52:32 pm »
some times you can pull the valve cover and there is moisture in that side if it cracked between the valves bad enough if it was me I would do both sides more than likely the other side will go soon to that's what always happened to me

Offline sawwood

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Re: Chevy 350 using water
« Reply #4 on: March 26, 2017, 09:16:44 pm »
I bought a 96 jeep with a 318 V8 from a guy that said it used water and ran a little hot but not over heat. I took the heads off
and both heads where cracked in the exhaust valve seats. The engine had 75000 miles on it so I just over hauled it. Was glade
I did as the cam shaft was bad and I needed rings. May be that's what is happing to yours.

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Offline E fan

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Re: Chevy 350 using water
« Reply #5 on: March 26, 2017, 09:23:49 pm »
K&W block sealer, best I've ever used . We used a can in an old chevy II we had a six banger in and it sealed up the leak we had

Offline Gearbox

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Re: Chevy 350 using water
« Reply #6 on: March 26, 2017, 09:38:10 pm »
The way to tell of a head gasket is this . fill the radiator half fill the overflow tank . start the engine and let idle while watching in the overflow tank where the line from the radiator hooks to the overflow tank watch for a small stream of bubbles in the water . It may take up to 10 min. at idle . If it is a head gasket use what E fan said . READ the instructions it takes about a half a bottle . Has worked for me at least 3 times on the kids cars .
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Offline Don P

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Re: Chevy 350 using water
« Reply #7 on: March 26, 2017, 09:43:28 pm »
Thanks guys. It must be small wherever it is right now, I'll try that in the morning.

Offline Chop Shop

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Re: Chevy 350 using water
« Reply #8 on: March 27, 2017, 12:05:54 am »

Offline Don P

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Re: Chevy 350 using water
« Reply #9 on: March 27, 2017, 08:08:51 am »
I've thought about that and might get one. I talked to a motorhead friend this morning and I think he is on to it. I said it was a crate but it was actually a long block. They had assembled the heads but I installed the intake manifold which has a bugger of a gasket and is prone to failing in the best of times. It connects to the water jacket, exhaust and intake but would not drop my compression reading. That's a good bit less digging to get back to or block sealer might work there.

Offline Joe Hillmann

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Re: Chevy 350 using water
« Reply #10 on: March 27, 2017, 11:12:18 am »
Are you actually running it with just water?  If so I have had many engines that would boil over, over heat or the water level would quickly go down when I ran them on just water.  As soon as I put in antifreeze the problems stop. 

Antifreeze not only lowers the freezing point it also raises the boiling point.

Offline Remle

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Re: Chevy 350 using water
« Reply #11 on: March 27, 2017, 11:21:01 am »
I'd start by pulling the spark plugs, if water is infiltrating a cylinder their should be evidence of it on the end of the spark plug.. then you will know where to look for the problem areas such as crack/ect.

Offline Ox

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Re: Chevy 350 using water
« Reply #12 on: March 27, 2017, 11:27:37 am »
The intake gasket going bad makes sense.  But how would you be getting compression/exhaust into your radiator?  Your intake doesn't have anything to do with keeping compression in an engine.

I remember working on a 74 Gran Torino I had years ago, with a 351W.  The intake actually let exhaust gases back into it, toward the rear of the engine, for the EGR valve to work, which was mounted near the carb somewhere.  Is this how your engine is?  If so I guess I can see how a failed intake manifold could allow some bubbling in your radiator.

I hope you take some pictures and keep us following along on this one.  I for one need to know exactly what's happened.
Good luck...
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Offline Don P

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Re: Chevy 350 using water
« Reply #13 on: March 27, 2017, 11:38:17 am »
It has antifreeze in it. When I checked compression yesterday the plugs all looked identical. That was part of what I was looking for was some kind of telltale on the plugs as well as a low cylinder(s). This is all making the intake gasket look more likely. There is exhaust running in the intake manifold so there is opportunity for them to be mixing there. I filled the radiator and reservoir this morning, with just water, cold now it looks like just water and same level so nothing went either way, I just idled it and didn't drive. It has been taking water out of the reservoir though so I know it can go into the system. Warmed it up and got no bubbles in the reservoir but... I have a 16 psi vented cap on the radiator which bubbled and vented liquid. I suspect that is not the right radiator cap. I bought a new one when I put on the new thermostat. The radiator is also new. The Haynes manual is calling for 15 psi and doesn't say vented or not. I think with a recovery tank it isn't supposed to be vented. The joy of mechanics, a million variables, it's good to bounce ideas around, I get stuck in the same loop.

Offline Remle

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Re: Chevy 350 using water
« Reply #14 on: March 27, 2017, 12:02:44 pm »
Another thing you can do is to hook up an air line to each cylinder and see if you get any air bubbles in the radiator from one cylinder or air coming out the air intake, of course you need both valves closed in the cylinder you are testing.

Offline Ox

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Re: Chevy 350 using water
« Reply #15 on: March 27, 2017, 12:08:53 pm »
So the EGR system runs exhaust through the intake manifold?  I have so much to learn about these new engines.  I figured since Ford started running the EGR exhaust from the exhaust manifolds back in the 80s that that's the way it would be done ever after.  :o Guess I learned my new thing for today.  :)

The variable valve timing engines don't even have an EGR valve.  They mix the exhaust with the intake charge by using valve timing to do it inside the combustion chamber...
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Re: Chevy 350 using water
« Reply #16 on: March 27, 2017, 02:11:46 pm »
I had an older car that used water. My problem was a water controlled choke. The water was going down the carburetor.
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Offline Gearbox

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Re: Chevy 350 using water
« Reply #17 on: March 27, 2017, 08:12:25 pm »
Was this crate motor complete with intake and all or a long block engine and heads . If you didn't replace the intake plentum that is the first thing I would do . GM's are famous the leaking plentums . After is sits overnight Have someone start it and stand by the exhaust you will smell the antifreeze .
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Offline Don P

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Re: Chevy 350 using water
« Reply #18 on: March 27, 2017, 09:29:14 pm »
It was a Goodwrench longblock 350 for an '89 Silverado. Heads were installed (they are cast iron), I swapped over my OEM intake, TBI, etc . Their build was good, she was a rocket sled of a work truck up until I overheated it. The castings were stamped Mexico and I think they did a fine job. The quality of the castings, machining, fit up to OEM were all very nice. I didn't get to mess with it any more we were sawing till dark and it looks like there's a pile to do. I'm tempted to remove the intake the next rainy day, hope I find the culprit, and if not the heads aren't that much more work at that point. With the compression still that tight and the fact that I put on the intake, I'm hopeful my work was what popped. I can look it over good with it out. I hadn't considered the intake manifold at all till this morning.

Offline Sawmill Man

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Re: Chevy 350 using water
« Reply #19 on: March 27, 2017, 10:30:00 pm »
I would try retorquing the intake just to see if that might fix it before tearing it apart. You just might be lucky.
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