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#1 |
Registered User
Join Date: Aug 2012
Location: nantucket,ma
Posts: 230
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black coolant
on my 72 c10 509 merlin 3 i have been driving the truck all summer but after the top radiator hose popped of i was refilling the radiator with the type of funnel that you can adapt a radiator cap to the bottom,when i look in the funnel on the top the coolant is black but when i crack the petcock green coolant comes out,i also noticed i am loosing oil somewhere but not burning it or leaking.thanks for the help
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#2 | |
Registered User
Join Date: Jan 2015
Location: Ventura, CA
Posts: 818
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Re: black coolant
Quote:
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..................... ____ .........________//__{\_____ ,,,,,,,/__(O)___//___/__(O)_/ 1970 C20 -_--_--_- ______ _--_--_- /___|__\____ -_--_-_ |_(0)|__|_(0)] 1972 K5 |
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#3 |
Registered User
Join Date: Jan 2015
Location: Ventura, CA
Posts: 818
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Re: black coolant
maybe do a compression test or leak down
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..................... ____ .........________//__{\_____ ,,,,,,,/__(O)___//___/__(O)_/ 1970 C20 -_--_--_- ______ _--_--_- /___|__\____ -_--_-_ |_(0)|__|_(0)] 1972 K5 |
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#4 |
Registered User
Join Date: Aug 2012
Location: nantucket,ma
Posts: 230
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Re: black coolant
head gasket?
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#5 |
Registered User
Join Date: Sep 2016
Location: Vancouver BC
Posts: 784
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Re: black coolant
Whenever I've run into coolant contaminated with engine oil, it makes a kind of thick goopy mix, usually coloured a kind of creamy brown. Hope this is not the problem you have.
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Rick -69 GMC 910 Long Box, 350 -98 Chev Silverado 1500, 350 Vortec 4L60e -08 Mustang GT Convertible |
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#6 |
Registered User
Join Date: Aug 2012
Location: nantucket,ma
Posts: 230
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Re: black coolant
no not goopy,creamy brown,same consistency as coolant just black with some residue.
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#7 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,859
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Re: black coolant
My guess would be exhaust leaking out combustion chamber by way of head gasket or crack into water jacket. I've seen that happen without coolant getting into oil.
I just fixed my '72 350. I had a frozen in head plug that led to pulling head which led to discovering a crack in head with coolant traces evident which is why plug froze. The coolant was blackish but the engine was clean as a whistle inside and so was oil. It just burned off the coolant. Only smoked when I started it (after sitting for days) and a valve would be sticky. Cleared up and ran fine once warm. It didn't use much coolant and this was going on for a while. I was figuring on needing an engine. New heads and it runs better than ever
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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#8 |
Registered User
Join Date: Aug 2012
Location: nantucket,ma
Posts: 230
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Re: black coolant
special -K i did notice a slight oil leak drivers rear area of head were head meets block,wonder if that has anything to do with it.
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#9 |
Senior Member
![]() Join Date: Dec 2013
Location: Gods country East,Tn
Posts: 8,545
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Pull the plugs , if you find one that looks steam cleaned you found your leak .
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![]() 1967 Factory short bed - Old school '71 - 350 / 4bolt / 487 heads / Edelbrock C3BX Muncie M-22 4 speed / Hurst Comp plus Factory 12 bolt posi 3.73 / 255-70-15 Smoothed firewall / Factory cowl induction Power disc brakes / power steering / 3.5-5" drop |
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#10 |
Registered User
Join Date: Aug 2012
Location: nantucket,ma
Posts: 230
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Re: black coolant
well,i pulled the plugs and found #1 plug almost white and the rest very dark with carbon,[still need to adjust carb.]then i took the spill free funnel off, looked in the radiator and could see perfect green coolant,so when running with the funnel is the only time i see black coolant [in funnel]i have all holes in the intake and water pump for heater hoses plugged because i do not have the heat hooked up,very confused here-thanks for the help.
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#11 |
Senior Member
![]() Join Date: Dec 2013
Location: Gods country East,Tn
Posts: 8,545
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Re: black coolant
Switch the "white "plug with one of the dark ones and drive it a bit and pull those two plugs again , if the #1 plug is white again you have found your leak in that cylinder , be it a Crack or bad head gasket . Before getting too crazy dump some Bars head gasket sealer in the radiator and see if that solves your #1 cylinder problem . Just a very small amount of water/coolant will give that steam cleaned / white plug look .
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![]() 1967 Factory short bed - Old school '71 - 350 / 4bolt / 487 heads / Edelbrock C3BX Muncie M-22 4 speed / Hurst Comp plus Factory 12 bolt posi 3.73 / 255-70-15 Smoothed firewall / Factory cowl induction Power disc brakes / power steering / 3.5-5" drop |
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#12 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,859
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Re: black coolant
Did it ever get hot? This is a new engine, right? That sure sucks if it is. If not from getting hot the problem is either from poor assembly or poor casting/materials of head. I'd do the plugs swap and see what you get, although I think we already know what that is. Still, no sense in breaking anything down before doing such a simple test. I've used system sealers before, but only on older engines. I'd want the issue corrected properly if I had a new expensive engine I hoped to get a zillion more miles out of.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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#13 |
Registered User
Join Date: Aug 2012
Location: nantucket,ma
Posts: 230
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Re: black coolant
i purchased the engine from a guy who bought it new and put it in a 67 corvette only to put about 200 miles on it,i have about 30 miles on it now and yes it does get a little hot 200-210 at idle,just checked the oil-no water,will switch plugs and run it now will let you know thanks
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