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.
Vette(s): black 1982 coupe slate gray interior, 350 crossfire, 1985 fuel pump, Steeroids R&P conversion
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?
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
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...
____________________________________ Joel Adams C3VR Lifetime Member #56 My Link
Vette(s): 1982 Black, ZZ4, Hooker Side Pipes, 3.55 Rear,
Rebuilt & upgraded 700R4, All new suspension, brakes, & new Charcoal interior.
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.
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.
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