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4/26/09 11:21pm - Original Message: 'Water Neck'
KDADDY79
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Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484
Last summer and again now I have a problem with the chrome water neck (thermostat housing) leaking antifreeze on to my Edelbrock aluminum intake manifold after the motor cools down.
I changed it from a chrome swivel type to a 45 degree stationery unit. The second unit worked fairly well until this weekend. More leaks after the motor cools down.
I tightened it with no improvement. I don't want to tighten it too much and strip out the threads on the softer aluminum intake manifold.
I'm considering going back to the stock type water neck with a standard type gasket. The "O" Ring gaskets just don't work.
Any advice & opinions are appreciated.
Kevin
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4/27/09 12:43pm - Reply: 'Water Neck'
VetteSpecialties
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Mounds View, MN - USA

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70 LT1 coupe, 69 350 HP coupe, 69 390HP 427 coupe, 71 LS5 convert, 85 coupe, 93 coupe

Joined: 5/24/2007
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I can't see any reason not to go back to the correct housing.  I always use the O ring gaskets, and put a little silicone sealer on the housing side.  I can't remember the last time one leaked.

Larry


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4/27/09 1:52pm - Reply: 'Water Neck'
crossfire1982
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Cramerton, NC - USA

Vette(s):
black 1982 coupe slate gray interior, 350 crossfire, 1985 fuel pump, Steeroids R&P conversion

Joined: 8/22/2006
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The leak you have seems to be  common with the chrome water necks.  A buddy of mine went through 2 of them on his 76 before giving up and getting a cast aluminum one, that solved the leak problem.  You may try sliding the mating part of the housing against a fairly course piece of abrasive paper  laying flat on the workbench to true and roughen the mating surface a bit to see if that helps.  Are you using any silicone on the neck?



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4/27/09 10:52pm - Reply: 'Water Neck'
kstyer Lifetime Member
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CUYAHOGA FALLS, OH - USA

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1975 C3 Red, T-Tops, Black Interior. All I need is time and money! Getting there!

Joined: 12/2/2003
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The silicone sealer is the key.   Make sure it's clean and dry first.

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4/27/09 11:11pm - Reply: 'Water Neck'
KDADDY79
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Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484
Hey guys,
I'm looking ahead to Wednesday.
I'll try replacing the O Ring and using the silicone.
If'n it don't werk, in the garbage it goze & I'll try the cast aluminum.
Thanks for the advice & I'll let you know how I do.
Kevin


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4/28/09 11:09am - Reply: 'Water Neck'
71Shark
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Edmond, OK - USA

Vette(s):
1971 Brands Hatch Green L48 Coupe Automatic Driver - restored 1995

Joined: 7/13/2006
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I have about 5 of those in my shop from DNV and Fireboss.  Thye have not been able to keep them from leaking.  Mine, on the other hand, is tight as can be.

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5/6/09 3:57pm - Reply: 'Water Neck'
KDADDY79
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Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484
Well, I'm back to work on this.
I went to a swap meet and bought a 45 degree aluminum water neck with the "O" Ring gasket. (No one had aluminum that takes a standard type gasket.)
So, I'll be giving this a try.
When I use the silicone sealer with the "O" Ring, how thick should I go with the silicone?
Could I create a problem if the silicone comes into contact with the "O" Ring when its snugged down & tightened?
Thanks in advance.
Kevin 


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5/6/09 7:42pm - Reply: 'Water Neck'
lukesvette Lifetime Member
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HOWELL, NJ - USA

Vette(s):
1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.

Joined: 5/18/2004
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I have an aluminum adjustable o ring housing. No leaks and no silicone...

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5/6/09 10:21pm - Reply: 'Water Neck'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

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The trick to using the chrome housing is to completely grind off the chrome on the sealing surface, preferably with a belt sander, so it will still be flat. The chrome will NOT allow a tight seal because it's so "slick"...fluids will seep right past a gasket, or even silicon. If you remove the chrome, it becomes regular aluminuminum(or steel), and a normal gasket will seal. Another neat trick is to use a little wheel bearing grease on a regular paper-type gasket...works like a champ, but even that will not seal against chrome...

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5/6/09 11:54pm - Reply: 'Water Neck'
DaveM Lifetime Member
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Flanders, NJ - USA

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1982 Black, ZZ4, Hooker Side Pipes, 3.55 Rear, Rebuilt & upgraded 700R4, All new suspension, brakes, & new Charcoal interior.

Joined: 1/27/2004
Posts: 2530
Kevin, don't use silicone adhesive with an o-ring, use a silicone grease on the o-ring itself, & in the groove, not on the metal to metal surfaces. O-rings need a good tolerance on the fit and chrome plating is thick and not always flat, so doing what Joel suggests would only help.
Dave


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5/7/09 2:54pm - Reply: 'Water Neck'
KDADDY79
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Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484
Folks,
Thank you for the input!
Nowz all we need here in Dutchess Co., N.Y. is a bit of good weather 'soze I can git 'er done.
I'm going to use the polished aluminum water neck I just picked up. The bottom of it is not polished. I'll go ahead and use a paper gasket with a bit of wheel bearing grease.
Wish me luck.
Kevin 


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6/28/09 10:09pm - Reply: 'Water Neck'
KDADDY79
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Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484

Problem Solved.

The water neck that worked was a two piece polished aluminum swivel type made by Spectre Industries. The O-Ring gasket looked a bit thicker than what came with the other ones I had used (and thrown out!).
No sealant used.
Thanks to everyone for the suggestions.
Thumbs Up
Kevin


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6/28/09 10:14pm - Reply: 'Water Neck'
jp75vette
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Bloomfield Hills, MI - USA

Vette(s):
1975 Corvette coupe, 4 speed manual, 383 ci 9.5:1,Edelbrock dual plane Air Gap intake, Alum Heads,Comp Cam, roller Rockers, PS,PB,Tilt

Joined: 6/29/2008
Posts: 199
I will try this also.
 
Why did you go with the swivel head versues that standard design?


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6/29/09 11:23am - Reply: 'Water Neck'
KDADDY79
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Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484
Basically because I had exhausted the other options.
The beefier O-Ring on the Spectre housing looked like it was worth a try.
The guy behind the counter at the speed shop also said he had not recieved any complaints about this one, too.
Two days later and it's still holdin' it's own.
Kevin


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