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Q: water in oil and exaust system on 1992 Toyota Previa

Engine started running rough and finally quit. Found water in oil. Pulled head and had it reworked by head shop. No signs of cracked block. Thought it must have been a blown headgasket. Re-assembled engine and started it up. It is doing the same thing. My question is; can water get into the oil pan any other way other than a cracked block. I know the head is good. I am not familiar with this kind of engine setup in a car.
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Did the head get pressure tested, at least 100 psi, under water? Because that is critical, sometimes a machine shop will re-work a head, and there is a tiny, microscopic crack that is invisible to the eye. I have had to take heads back an insist that they pressure check it for at least and hour and guess what, there is a crack!
A crack in the block can be felt by using your finger nail on the cylinder walls, if the walls are scored or discolored, like bluish or even yellowish, then the block is done.
These are the most common ways water can get into the oil. Sometimes a bad intake manifold can mix oil with coolant, but that is more common with plastic manifolds.
mr.dandd, Thank your for your reply to my question. The cylinder walls were checked for cracks. I don't know if the head was pressure checked or not. The car belongs to my son who lives in Mesquite Texas. I will tell him what you said about the intake manifold. Once again thank you very much.
there's a freeze plug inside the oil pan. will need to remove oil pan to check. did you use oem head gasket?
I know previa vans very well. I've worked on them on a regular basis. On a Previa, there can be micro cracks on the head between the valves. However, if there is no cracks to be found, and it seems just the leak on the gasket, your issue could be the block itself is worn. The wear would be on the spot where the cylinder head is blown before. If the block is worn badly from the water eating through it, you will need to replace the block or just get another engine.
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