A lot of water in the oil in just minutes

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Aug 24, 2013
Hello all, I've been reading this forum for years and finally just registered because I am really stumped. I just bought a 96 fzj80. This is my second I've had. I bought it because it was dirt cheap. The PO had a check engine light come on so took it in to a shop. They called him later and said that he had a broken crank and it was going to be $2000 to fix it. So he sold it to me for next to nothing. I had it towed and found that it was hydro locked so I removed plugs got all the water out and changed the oil. Also found fresh looking antifreeze in the air filter housing so I bypassed the coolant line through the throttal body just in case. I ran it for less than 10 minutes and had billows of white smoke coming out. So dumped the oil again with atleast one quart of water in the oil. Re-filled and start again. Exact same result.

I can't imagine a bad head gasket allowing that much water in, it seems like water is being dumped in the engine. And with fresh anti freeze in the air filter. What else could I be missing. I keep thinking that shop sabatoged the motor and swap hoses or something. The PO said it ran great before taking it to the shop. Of course that could be BS.

Any thoughts would be great.

Bad Head Gasket or cracked head/block?

Head gasket blew to the cylinder?
I've seen threads where the oil cooler corroded (it's an oil to water cooler)

With that much water in the oil you will likely need a full rebuild anyway.
Pull the sparkplugs and track which cylinder they're from. A single clean plug means coolant to that cylinder only and is HG type news. All of them showing steam cleaned means oil cooler or other source putting it in all oil. However. Hydrolocked indicates head gasket to me as oil cooler or crack would not do that unless total coincidence its a crack only in one cylinder. If still no joy, consider using dye in coolant, start engine to circulate it, shut down, remove the valve cover and use a radiator cap pressurizer. That will quickly show head cracks as it will either be visible atop the head, or fill a cylinder with the dyed water.

These are tough engines - don't give up so quick on it.

Thank you for the responses. I'm going to get the oil cooler next. I didn't mention before that when I pull oil the oil filter I get absolutely no oil just a little water. I guess that would point to the cooler as well.

Thanks again.
A blown oil cooler will not fill the cylinder with coolant. It will fill the coolant with oil.

That's a blown gasket or cracked head.
If that much coolant has been going in the basement and getting sucked up by the pump you will want to pull a couple of rods and mains to check the bearings.
Bearings do not live long with coolant running through them, it will eat them up.
That blows the theory of the oil cooler being the problem. I have no signs of oil in the coolant. I was hoping for something easy.
Water in your oil can come from the oil cooler if it runs through the bottom of the radiator but that is used for warming/cooling transmissin fluid on a automatic trans.

Is yours an auto or manual?

The problem comes from the engine hydro locking which is a whole different problem, water in the cylinder. That would indicate a blown head gasket or cracked or damaged head. Water past the piston ring from under the piston is very rare (1000000/1) in one cylinder to hydro lock a motor.

This is a marine chev 350 that a valve dropped on. The broken valve pounded into the head thus #6 hydro locked at WOT (4500 RPM's).

Have you done a compression test or a dye test to give any clue as to where its from?

I'm sure you'll find your head gasket failed or the head is cracked.



So, I haven't had time to dive into compression tests etc for the engine. But I have been detailing out the interior a little each night after work. I notice the carpet under driver side and passenger side was wet. I pulled the carpet back and found oily water puddled in the valley's in the floor board.
I'm not sure if this is related to the water in the oil but what the hell? If she could only talk and tell me what happened to her.
Thought I would share. I'm scratching my head over here.
That sounds like something easy. Most likely the sunroof drains are plugged, usually the easy to reach front ones. Assuming you have power to open it, do that, front drains are obvious. Others have used string trimmer line to run down them. I had good luck with stainless steel cable, like from a garage door, as it's heavier. Plunge for effect and that usually opens things up down below.

Several threads here with pics if you search.

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