For the last year or so I have had five different water necks (thermostat housings) fail. I have used the O-Ring type gaskets when called for and the paper type gaskets when called for. Recently I used the blue colored silicone sealer under a scuffed up O-Ring type water neck without success. The stock type water necks with the silicone failed too.
What normally happens is after the motor cools down overnight I find a puddle of antifreeze on the (Edelbrock Performer) intake manifold.
Would a radiator cap with a lower pressure solve this problem?
Any bad side effects from using a radiator cap with lower pressure?
This is driving me NUTZ!!!
Thanks for any suggestions.
Vette(s): 1980 L-48 still in the middle of a frame-off.
Are the mounting surfaces of the housing and the intake square??? Place a straight edge on top of the mounting area on the intake and see if it is flat. Check the the t-housing too. If you have a high or low spot then that is where the leak is. I would look at the hose also.
I know I know, I have problems drwaing stick people too.
Corvettes and women are the same...You want to make love to them but they keep breaking down.
Yeah, I have checked the intake manifold with a metal straight edge and found it to be without any irregularities. The housings too. I've also made sure that both surfaces are clean and dry before getting to work.
I replaced the radiator hoses two years ago as preventative maintanance and recently I went with a 180 degree t-stat. The car has always run without overheating issues.
I just dunno!
I'm thinking the lighter pressure radiator cap might be worth trying. I'll wait for some more feedback.
Vette(s): 1975 metallic blue coupe with t-tops,L48, t/t steering, black leather interior. 1990 L98, white/red leather interior, auto,a/c
kevin, i had a stat cover with the o ring type gasket. started it up one time and was leaking. i took it off and checked everything and it appeared ok. what i found when i was reinstalling it was that the bolts i was using were just a hair too long and i installed a washer on both bolts and it solved the problem. don't know why i didn't notice it when i first put the housing on or why it didn't leak for a while but just figured i was lucky. hope this might help.
____________________________________ LIFETIME MEMBER #97 THE DYNAMIC DUO
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
Going to a lower pressure rad cap is not a good idea...it's gonna spit coolant out before it gets to normal operating temp, plus, the higher the pressure in the system, the higher the boiling point of the coolant is. I've run into situations similar to yours, and I've found that the leak will stop itself eventually. This is assuming that the leak is actually coming from between the neck and the intake.... I wouldn't recommend using any type of sealant on the gasket, neck, or intake...just clean & dry.
____________________________________ Joel Adams C3VR Lifetime Member #56 My Link
I'm thinkin' I might have fixed it today.
On went the new alum. water neck with the O-Ring gasket. Put it on bare back...no sealants or such, just the O-Ring.
After letting it warm up, I shut it down and let it sit for 3 hours or so and saw no leaks. Later I even took it out for a ride for the first time in weeks and saw no leaks.
I sure hope I'm not speaking too soon, but it's looking good.
I'm going to keep an eye on the upper radiator hose because I had to muscle it on a bit. This water neck rose up at a different angle than the others. Hood clearance was OK, though.
the chrome ones are the worst, first you have two disimular metals, chrome and alum., chrome and cast iron, after a while electrolist starts to eat the chrome, on the neck, or the alumn,or both, then a leak, also the chrome is so slick the RTV won't stick or seal ,maybe take a piece of glass and wet and dry sand paper and rough up the bottom of the neck, if the neck mounting holes go through into the manifold water jacket make sure both threads are clean use Permatex none hardning gasket sealer, and let it set, personlly I don"t like RTV in water jacket bolt threads or intake bolts, Permatex seems to seal better. anips2009-06-27 21:48:18
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