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03-05-2006, 10:58 AM
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CC Member
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Join Date: May 2004
Location: centralia,
IL
Cobra Make, Engine: B&B cobra (sold), Hurricane HMS1002 (sold), Kirkham 289 FIA, (sold) RCR GT 40(sold) SPF GT40 2122(sold) Hurricane HMS2002, (sold) RCR SLC (sold) GTR on the way!
Posts: 1,288
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Not Ranked
vanishing coolant!!
I have a friend with a 69 vette that has a coolant issue. Everytime he drives the car he needs to add coolant. There are no leaks to track and the car doesn't seem to smoke. It has to be burning it up. What should we check? What are the likely suspects?
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High Maintenance Racing Team
Run & Gun 2003 - 2013 
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03-05-2006, 11:31 AM
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CC Member
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Join Date: Dec 2000
Location: Los Angeles,
CA
Cobra Make, Engine: E.R.A. FIA #2088 1964 289 w/Webers
Posts: 2,151
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Not Ranked
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Hyde D. Baker
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03-05-2006, 11:55 AM
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CC Member
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Join Date: Jan 2002
Location: Bridgewater,
NJ
Cobra Make, Engine: B & B
Posts: 1,323
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Not Ranked
Oil will looked whipped. Look at the dipstick, breather, or drain the oil.
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Just enough knowledge to build a cobra and be dangerous...
You can observe a lot from just watching.
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03-05-2006, 01:38 PM
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CC Member
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Join Date: May 2004
Location: centralia,
IL
Cobra Make, Engine: B&B cobra (sold), Hurricane HMS1002 (sold), Kirkham 289 FIA, (sold) RCR GT 40(sold) SPF GT40 2122(sold) Hurricane HMS2002, (sold) RCR SLC (sold) GTR on the way!
Posts: 1,288
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Not Ranked
I checked it. Oil looks good. It must be a head gasket with a slow leak.
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High Maintenance Racing Team
Run & Gun 2003 - 2013
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03-05-2006, 01:49 PM
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CC Member
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Join Date: Nov 2003
Location: New Britain,
CT
Cobra Make, Engine: Size 10 Feet
Posts: 2,995
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Not Ranked
I've seen this happen when there's a crack between a cylinder head water passage and the exhaust port too. It only leaked when the engine was hot and the coolant was pressurized. The stuff wasn't visible in the hot exhaust.
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03-05-2006, 05:58 PM
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CC Member
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Join Date: May 2004
Location: Mobile,
Al
Cobra Make, Engine: StreetBeast 66 replica 302 350HP
Posts: 335
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Not Ranked
just in case, did your friend check out the radiator cap, an old or damaged cap can cause you to loose coolent through the overflow tank, make sure the PSI rating for the cap is what the system is rated for
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PapaJohn
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03-05-2006, 06:03 PM
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Club Cobra Member
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Join Date: Feb 2003
Location: SF East Bay,
Ca
Cobra Make, Engine: SPF
Posts: 499
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I had this exact problem in my early Mustang. I looked for years and never found any evidence. The oil was always good, the plugs never showed any strange deposits, the heater core and hoses were always dry as a bone. I put a catch can on the overflow to see if it was blown overboard, it wasn't. Finally, mostly due to unknown age, I took the radiator that showed no signs of leaks out to have it re-cored and overhauled. I asked the guy at the radiator shop if he would test it before opening it up. He put it the water tank and put a few PSI of air in it. I swear it looked like the Lawrence Welk show there were so many bubbles coming from everywhere. I looked at this thing all the time with the car at temperature and running and never saw any evidence but that radiator had more holes then the border between Mexico and the US.
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We have enough youth. What we need is a fountain of common sense
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03-05-2006, 06:48 PM
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CC Member
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Join Date: Jun 2004
Location: Perth, AUSTRALIA,
W.A
Cobra Make, Engine: Lucus shell, Arrow chassis, efi 5L HO, 5 spd supra, Diff 3.73:1, Rear tyres 275x60-15
Posts: 229
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Not Ranked
Not sure if you have tried this yet, but here is a suggestion that has solved the same problem for me in the past…
Remove the radiator cap and with the engine running have a look into the radiator coolant, if there are bubbles in the coolant you will probably have an internal leak on the head gasket from the water passages into a cylinder. Will need to remove the head in this case.
You could try and re-torque the head, this has worked in the past to stop small leaks.
Do you have access to a cooling system pressure tester. With a pressure gauge?
Simmo
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Black Rubber Needs To Be Layed
Last edited by simon clemens; 03-05-2006 at 06:54 PM..
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03-06-2006, 04:10 AM
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CC Member
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Join Date: May 2005
Location: Ravenswood,
WV
Cobra Make, Engine: Late 70s Allied Industries?? 454 BBC; alum copo heads and intake THM 400 12 bolt posi ++ 06 CL 55 AMG
Posts: 201
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Not Ranked
One of the family trucks (Chevy- 350) never had fluid in the tank. Eventually, head gasket issue. Given the choice of new engine or repair -- I opted for repair. Has run well for several years. Knock on wood, etc. But with the Vette, the option will be an engine rebuild or repair, unless he doesn't have the original engine anyway.
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03-06-2006, 05:06 AM
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CC Member
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Join Date: Sep 2002
Location: Hickory,
NC
Cobra Make, Engine: ERA 427SC w/427so, ERA GT #2002
Posts: 1,106
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Not Ranked
dlampe
Have your friend do a leak-down test on the engine. With the radiator cap off, pressurize each cylinder. If any bubbles are detected in the coolant, the problem will be the head gasket or a crack in the cylinder head.
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Tom
"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough HORSEPOWER." Mark Donohue
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