Water oily but oil not watery!

[byrnziecelica]

Gday Toymoders!

Been a while since I've posted. Have a question!

I've bought myself an RA28 and am starting an engine conversion for her. We've placed the 1UZ into the old girl and started to run her. Shes heating up, losing water and oil. Can't find where the oil is going and the water I'm convinced is escaping from the intake manifold.

I'm assuming the head gasket is the problem. However, it seems that the although the water has oil residue, the oil is not watery. Not even in the slightest.

If the oil is not watery but the water is oily... could that be anything else but head gasket?

Cheers.

[IN 05 NT]

so you run a combined radiator/oil cooler (internal oil cooler in the rad?)....as this has leaked and stumped me on a customers car b4....

tho...most likely a HG.

[79GT]

a blown head gasket doesnt always blow both ways, does occur that the head gastket seals on combustion as the cylinder goes down,

but on compression stroke whatever seals the HG is pushed out of the way blowing oil into the water galleries, then on compression that piece of gasket is sucked back into place and prevents any water getting into the oil.....

The above is the reason chemiweld doesnt always work (NOT that i am saying it is what you or anyone should do to anything they care about...a daily runnabout at best)
- it will only work if the engine sucks the water into the oil, (hence chemiweld clogs the leak when it tries to get sucked through).
- but it wouldnt work in the case where the oil pushed through into the water, as the chemiweld will be continually blown away from the leaky HG.

all in all..regardless of whatever....Blown HG

[CrUZida]

This would probably be about the 3rd 1UZ I've heard of blowing a head gasket, ie, its probably something else.

How oily is the water? if its just got a residue/slick on the surface then its probably just contamination.

How many times has it 'used water' ? It could be that its just getting rid of all the air pockets.

[jeffro ra28]

a blown head gasket doesnt always blow both ways, does occur that the head gastket seals on combustion as the cylinder goes down,

but on compression stroke whatever seals the HG is pushed out of the way blowing oil into the water galleries, then on compression that piece of gasket is sucked back into place and prevents any water getting into the oil.....

all in all..regardless of whatever....Blown HG

Could you explain how cylinder strokes, compression etc has got anything to do with blowing oil into water?
UNLESS compression seal is broken between oil pressure gallery AND water gallery. Seems VERY unlikely that the 3 critical seals are broken and line up in such a way that it exchanges between the 3 systems. The head gasket would have to be blown in 4 places for this to happen. Now unless its a 7m, how likely is that?

The most likely scenario to me in case of a HG fault is that a oil pressure gallery seal on the HG has blown into a water gallery seal on HG. Oil pressure being much higher then cooling system pressure. It really has nothing to do with compression strokes etc.

Before making any assumptions id be asking

How long has it been runing for? Does the radiator belong to the car or engine? Do you know the history of the radiator and or engine?
Basically the question i am asking is was there any oil in the heater hoses, heater core or radiator prior to it being run with the 1uz?

I say, give both systems, oil and water a good flush and clean out using appropriate methods. Then start over.

[79GT]

my apologies for the above comments. it was late at night.
the above is how it was explained to me and now i think about it, when that was explained to me we where discussing the 7M's and chemiweld only working on the odd occasion and the reasons for it.

apologies to those mislead. :s