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Old 08-18-2007, 05:29 PM
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Water neck

I have a SB350 with an edelbrock performer intake manifold, the other day the water neck started to leak. I thought the bolts might be coming loose but they seem to be tight. I dont want to over tighten and strip them out seeing as it is an aluminim manifold. Does anyone know why this might have happened? It starts to leak when the motor begins to heat up. I ran the motor all last year with no leakage. And does anyone know what the torque specs are on the water neck bolts?

The radiator I am using is an all aluminim with no drain plug which means I have to pull the lower hose off and try and control the flow into a bucket which gets real messy. If I need to change out the water neck gasket, do I need to completely drain the radiator? or can I drain out some water below the level of the thermostat/water neck line? I was going to try and just take off the water neck and remove the thermostat and let it flow, but if it was going to be a large amount of antifreeze it would be difficult to drain in a bucket.

Thanks for the input...

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Old 08-18-2007, 05:35 PM
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Does your neck use a gasket or the rubber O-ring style?
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Old 08-18-2007, 05:38 PM
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Last year when I installed the manifold, I think I might have made a mistake and used both of them. I think it had an O-ring gasket and I also used the paper gasket. Rookie move, but it never leaked after I did this until the other day. Seeing as it never leaked, I just let it be.
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Old 08-18-2007, 05:46 PM
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Thats something you will want to investigate to make sure you have one or the other, and then go from there. Just drain till the water level is below the neck.
I also have a rad with no plug. I usually just take the hose off the water pump and funnel/splash the water down into a bucket the best I can.
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Old 08-18-2007, 06:38 PM
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Water neck

Look for corrosion and pitting on the water neck or manifold. They may be the cause of the coolant leak.
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Old 08-18-2007, 06:41 PM
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Water neck

On aluminum always tighten until the bolt starts to strip then back off a half turn......LOL.......that's just an old joke.
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Old 08-19-2007, 08:17 AM
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what brand neck is it ? the cheaper china ones like to leak.
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Old 08-19-2007, 08:36 AM
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Studs, I use them where ever I can in my aluminum intake.
Thermostat housing, Dist hold down, throttle cable bracketry.
Once they´re in you can forget them.

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Old 08-20-2007, 10:37 AM
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I see that installing studs would be a good idea. Now, as far as the gasket is concerned, should I use the O-ring style or the paper type gasket? and the water neck is an autozone chrome neck, do the summit water necks provide a better seal?

Thanks again for the input...
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Old 08-20-2007, 10:53 AM
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Quote:
Originally Posted by 7dcrzr
...the water neck is an autozone chrome neck...
I've had two - and neither would seal worth a crap.
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Old 08-20-2007, 10:56 AM
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The thermostat neck you see on my intake is a Summit piece, I tossed the O ring and used a paper gasket with some silicone.
I also sanded the underside of the neck, I´m sure the chrome does´nt help to seal.
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Old 08-20-2007, 12:09 PM
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Quote:
Originally Posted by 7dcrzr
... and the water neck is an autozone chrome neck, ...
Quote:
Originally Posted by Vortech 4.3
what brand neck is it ? the cheaper china ones like to leak.
Tell me about it





Ed
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Old 08-20-2007, 12:54 PM
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Quote:
Originally Posted by 7dcrzr
I have a SB350 with an edelbrock performer intake manifold, the other day the water neck started to leak. I thought the bolts might be coming loose but they seem to be tight. I dont want to over tighten and strip them out seeing as it is an aluminim manifold. Does anyone know why this might have happened? It starts to leak when the motor begins to heat up. I ran the motor all last year with no leakage. And does anyone know what the torque specs are on the water neck bolts?

The radiator I am using is an all aluminim with no drain plug which means I have to pull the lower hose off and try and control the flow into a bucket which gets real messy. If I need to change out the water neck gasket, do I need to completely drain the radiator? or can I drain out some water below the level of the thermostat/water neck line? I was going to try and just take off the water neck and remove the thermostat and let it flow, but if it was going to be a large amount of antifreeze it would be difficult to drain in a bucket.

Thanks for the input...
Leaking from where? Does it leak between the return neck and the manifold or is it thru the casting of the manifold.

All of this is aluminum which is fairly soft, the act of torquing the parts together distorts them. The greater the torque the greater the distortion which is why these kind of leaks aren't fixed with more force. Most likely the return elbow is bent and can't seal the gasket or O ring it that case it will have to be replaced. It's possible that the intake is also distorted or even cracked from excessive bolt torque. It may also experience corrosion failures in this area from using ordinary steel or zinc plated bolts. The dampness from the cooling system sets up a battery between steel bolts and the aluminum which rots the aluminum. You can't really stop this process but you can reduce it with stainless fasteners and washers with the use of anti-seize.

As far as leakage thru the casting goes, this is pretty common with aluminum, manufacturers treat the casting with a sealant, but this will eventually fail in service.

Bogie
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Old 08-20-2007, 01:23 PM
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"If I need to change out the water neck gasket, do I need to completely drain the radiator?"

I put a tube into my rad right to the bottom and syphon it out, that´s plenty enough to do the thermostat or fan switch,temp sender in the heads.
When your done just pour it all back, hardly a mess.
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Old 08-20-2007, 01:40 PM
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Don't forget, if you can get to them, the sbc has a block drain just above the pan rail on both sides, I normally put a petcock on each side to drain for just such occasions. the 2nd benefit from draining here is, that you get the last bit of sediment from the bottom of the water jackets drained out first, it's alot more controllable flow of fluid than cracking loose a bottom hose!! ( IF you can get to them in your application!!)
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