What are the chances of a headgasket blowing in way that allows coolant to enter the cylinders but not coolant into the oil or vice versa

Kinja'd!!! by "aberson Bresident of the FullyAssed Committe" (emaxxbl)
Published 04/04/2017 at 13:14

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just wondering.......


Replies (21)

Kinja'd!!! "Jcarr" (jcarr)
04/04/2017 at 13:16, STARS: 0

I’d say nearly impossible. Once it’s in the cylinders, it’s going to get in the oil.

Kinja'd!!! "Nibby" (nibby68)
04/04/2017 at 13:17, STARS: 0

Kinja'd!!!

Kinja'd!!! "RamblinRover Luxury-Yacht" (ramblininexile)
04/04/2017 at 13:17, STARS: 1

Pretty high on most cars. Oil passages into the head tend to be very minimal, but coolant passages? Everywhere, usually.

Kinja'd!!! "Demon-Xanth knows how to operate a street." (demon-xanth)
04/04/2017 at 13:19, STARS: 4

Easily possible. Has happened. If there was a gap where any of the arrows are in the top of this picture, it would do just that. It could be verified by cylinders that get steam cleaned as well as exhaust entering the coolant. A compression test and a quick bore scope will likely tell where.

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Kinja'd!!! "jasmits" (jasmits)
04/04/2017 at 13:32, STARS: 3

The problem is if coolant is entering into the cylinders and burning off without merging into the oil there will be no tale-tell milkshake oil.

Kinja'd!!! "Takuro Spirit" (takurospirit)
04/04/2017 at 13:33, STARS: 0

Anything is possible. My Subaru leaked ONLY compression into the coolant when put under a load, which made it pass every pressure test/head gasket leak check known to man.

Most just leak oil into the coolant, or oil externally.

Kinja'd!!! "RamblinRover Luxury-Yacht" (ramblininexile)
04/04/2017 at 13:33, STARS: 2

I think he meant in the sense of direct cross-contamination, passage to passage. Coolant into the cylinder in small amounts can absolutely get vaporized before building up in the oil, though.

Kinja'd!!! "Die-Trying" (die-trying)
04/04/2017 at 13:33, STARS: 0

very possible......

Kinja'd!!! "Nibby" (nibby68)
04/04/2017 at 13:34, STARS: 3

fuck, what good are cars if they can’t even make chocolate milk

Kinja'd!!! "jasmits" (jasmits)
04/04/2017 at 13:35, STARS: 0

It happens. Not as often as other ways of blowing, but it happens. I’ve done a ton of research on a mystery slow coolant disappearance in my 4Runner with no visible drips and no other symptoms of a head gasket and that came up as a definite possibility. It seems to actually be a drippy coolant line behind the engine getting burnt off on the exhaust manifold.

Kinja'd!!! "itschrome" (itschrome)
04/04/2017 at 13:36, STARS: 0

..

Kinja'd!!! "adamftw" (adamftw)
04/04/2017 at 13:37, STARS: 1

I’ve seen lots of ways for them to fail. The head gasket went on my Land Rover and barely mixed fluids... exhaust was leaking from the combustion chamber and pressurizing the cooling system, that was a first for me.

Kinja'd!!! "adamftw" (adamftw)
04/04/2017 at 13:39, STARS: 0

Same with my Rover. Had to do an exhaust gas test to confirm, but I was pretty sure before that anyway.

Kinja'd!!! "Tekamul" (tekamulburner)
04/04/2017 at 13:39, STARS: 0

It absolutely happens. The result is easy to see, because exhaust gases blow into your coolant system, and therefore your overfill bottle. It turns the coolant brownish, and smells like exhaust, of course.

My Subaru did that. It would overheat with no milkshake, because it was blowing all the coolant out of the system. If I pulled the spark plug wire for the offending cylinder, it would run like shit but stop overheating.

Kinja'd!!! "CalzoneGolem" (calzonegolem)
04/04/2017 at 13:45, STARS: 0

~36.72%

Kinja'd!!! "AMGtech - now with more recalls!" (amgtech)
04/04/2017 at 13:52, STARS: 0

Depends on the engine. I’ve seen more fail this way than any other way. Those were 99% rover V8's though.

Kinja'd!!! "RamblinRover Luxury-Yacht" (ramblininexile)
04/04/2017 at 14:02, STARS: 1

...which also sometimes pretend to have a head gasket failure but are really experiencing leaks next to the liner. Huzzah.

Kinja'd!!! "deekster_caddy" (deekster_caddy)
04/04/2017 at 14:11, STARS: 0

It’s very possible, it’s also possible that it’s an intake manifold gasket that’s leaking. More data please...

Kinja'd!!! "Urambo Tauro" (urambotauro)
04/04/2017 at 15:22, STARS: 0

Happened to my ’94 Cougar (V6). It did a wonderful job of steam-cleaning the pistons, too. No sign of milkshake anywhere.

Kinja'd!!! "Meatcoma" (mastapoof)
04/04/2017 at 15:36, STARS: 0

Are you certain it’s entering the cylinders? Just asking.

Kinja'd!!! "Meatcoma" (mastapoof)
04/04/2017 at 15:37, STARS: 0

You can have a test done on your coolant to see how much exhaust is in it.