after recently overheating & getting some white smoke out the tailpipes & taking it in to my retarted mechanic who pressure tested the cooling system & told me everything was fine I've discovered a milky substance on the inside of the oil fill cap this is the only sighn of moisture in the system, should I still pull the heads & see if the gaskets are shot or possably more. feedback appreciated
milk on oil cap
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You have a problem bro. You're going to have to pull the heads and check thim for cracks. Take them to a shop to have them tested.
That sucks Bro :down:
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2,988 Posts
The milky substance is antifreeze contaminating the oil, you didn't tell us if you changed the oil after the overheat condition and it returned. Regardless, I suggest you pull the heads and have the run-out checked on the matting sufraces, one or both may be warped. It's one thing to overheat, but you pushed antifreeze and oil out the exhaust, not a good sign for the main bearings either.:down:
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Hi There!
I'm new here.
Milky stuff on oil cap? Our 1988 Chevy truck has that problem a lot.
Yes it's anti-freeze. But going so far as to start pulling the heads off the engine right away is, shall we say, not a good idea.
First thing to do get an oil sample off to a lab. Auto parts stores sell these little kits for a couple of bucks. Find out what it is that your dealing with first. Yanking heads might be a lot of fun but expensive especially if you don't have to. Keep your car in one piece for as long as you can.
Get your cooling system pressure tested, or vacuum tested, whatever your mechanic prefers. What if you pull the heads and find nothing wrong? :WTF
Eliminate what could have happened first. water in the fuel, leaks in the intake manifold or some other source of water getting sucked in the engine. Who knows it maybe a bad radiator cap.
Happy Hunting!
I'm new here.
Milky stuff on oil cap? Our 1988 Chevy truck has that problem a lot.
Yes it's anti-freeze. But going so far as to start pulling the heads off the engine right away is, shall we say, not a good idea.
First thing to do get an oil sample off to a lab. Auto parts stores sell these little kits for a couple of bucks. Find out what it is that your dealing with first. Yanking heads might be a lot of fun but expensive especially if you don't have to. Keep your car in one piece for as long as you can.
Get your cooling system pressure tested, or vacuum tested, whatever your mechanic prefers. What if you pull the heads and find nothing wrong? :WTF
Eliminate what could have happened first. water in the fuel, leaks in the intake manifold or some other source of water getting sucked in the engine. Who knows it maybe a bad radiator cap.
Happy Hunting!
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95 Posts
No way coolant should be in the oil.
As said above you can do a rad preasure check and then a cylinder preasure
check and see what gives. Overheated, heads warped, gaskets, cracked? who
knows but not a good idea to get coolant on the main bearing or she is toast.
As said above you can do a rad preasure check and then a cylinder preasure
check and see what gives. Overheated, heads warped, gaskets, cracked? who
knows but not a good idea to get coolant on the main bearing or she is toast.
thats what the mystery is the guy "pressure tested" the cooling system & it held pressure in the cooling system overnight so he rests assured that the cooling system cant be leaking, but I know there's alot of white milky oil on the underneath of the oil cap ( that was never there before) is it poss for the system to hold pressure yet still leak internally ?
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3,766 Posts
You could still have a leak and not find problems on a pressure test, particularly if the pressure test is done on a cold engine. Some cracks will only leak when the gasket material expands a bit. It's just like an interference fit part; once the temperature difference is gone, it seals.
If you continue to have the problem, check the easy stuff first as mentioned. There's a coolant crossover tube that goes through the throttle body of LSx motors that can leak as well, but that tends to drip down the front of the motor. It's possible that it could get pulled into the intake though. If your problem is temperature related, sounds like a head gasket. It might be tough to determine without some teardown.
If you continue to have the problem, check the easy stuff first as mentioned. There's a coolant crossover tube that goes through the throttle body of LSx motors that can leak as well, but that tends to drip down the front of the motor. It's possible that it could get pulled into the intake though. If your problem is temperature related, sounds like a head gasket. It might be tough to determine without some teardown.
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Are you kidding me?:WTF
thanx for the feedback guys I think I'm gonna TOW it to a reputible mechanic today & hav'em pull the heads & check it out, by the way there's also a popping sound at about every 5th or 6th lope of the cam that is mixed with sort of a gurgling sound, as much as I hate to I cant chanse screwing something else up. dam this hurts. I'll get back with the outcome.:thud:
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Youch!
Man, best of luck to you in all this. I feel your pain.
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you are kidding Right...:surprised :thud: Your radiator would look like a balloon...
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