This model 93 TS 3cylinder manual doesn't seem to have an oil cooler. I have had the head gasket replaced twice now, the head planed and still not solving the problem.
I agree that its got to be under pressure but where else could oil be getting into the cooling system. Could it be a crack in the block near an oil gallery, could this be possible ? seems no-one has heard of the charade doing this.
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Re: Diahatsu 93 with Oil in cooling system
The CB23 engine is really robust, but the head is known to crack around the exhaust side on the rare occassion.
A common mistake guys make when putting the head back on is leaving water in the head bolt holes meaning the bolts don't cramp down hard enough. If your head was put on by a professional I would expect they would have cleaned them out.
When you had the head skimmed the machinist should have crack tested it and I would ask if this is the case.
The primary place I would think of where oil and water would logically come into full bodied contact is where the head mates to the block. If you look at this pic the oil is squirted through the bottom left oval hole into the rocker area of head and returns to the sump by gravity via the large opening at the top right. But the problem with this is that the oil is not under anything but low sump pressure.
The place where oil would be under very high pressure and much higher than the water pressure is residual amounts in the combustion chamber. Whereas the water pressure is regulated by the radiator cap to about 110 kPa the cylinder pressures are up around 1200kPa in your engine. This is where I would expect the transfer of oil to be taking place.
If the gasket has not been tensioned down in the correct order to around 6.0 kg-m (44ft-lbs) the oily gases will transfer between the gasket binding surfaces into the water galleries. A small fissure in the head or block will also transfer oil.
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Would need more information on the year, manufacturer, model and engine size. That said, most engine oil coolers do not use engine coolant as a cooling medium. They are mounted in front of the radiator and use air cooling. If that is the case, water in the sump would most likely be due to a blown head gasket, cracked head, or cracked engine block.
Oil coolers for automatic transmissions are often installed internal to the vehicle radiator, and if one of these breaks, then coolant will infiltrate the transmission sump and transmission oil will infiltrate the cooling system.
IT is possible that the head gasket is loose and the oil passage to the overhead gear is compromised and oil is being force past the gasket into the cooling system. Some engines have an engine oil cooler in the side to cool the engine oil and if yours has one it may be split in internally. They can be tested but are di9fficult to repair. You will see radiator hoses going to and from the unit and it is bolted to the block
It's possible that the old head gasket has de-laminated and the oil is passing through the inside layers of it. That is sometimes difficult to see. Too late to check now but you should have checked the oil in the engine for coolant intrusion. Once apart, there always will be some in there so looking now is not valid. (why you always need to change oil after changing a head gasket). Some '00 4.0L heads develop micro cracks that are difficult to find...it's possible you have an earlier head than the vehicle build year. Also, have your radiator tested.... there is a transmission oil cooler in it if it's an automatic trans. If it fails, you will also have oil in the cooling system, but it will be trans oil. If you originally had coolant loss and steam from the tailpipe or you had a hydrocarbon test done on the cooling system I'd suspect the gasket or the head. If not, put the new gasket in and have the radiator tested. Same as coolant in the engine, if the cooler went bad, change the trans oil. if it turns out to be micro cracking, either replace the head or use one of the high $ block sealers to stop the seepage. 'Though I don't like using sealers, on micro cracks they seem to work pretty well if the directions are followed exactly..
Yuo have engine oil into the coolant system.If your engine is diesel you have two opportunity.First is engine oil cooler/top of oil filter/ and second-cylinder head gasket.If petrol engine-only cylinder head gasket.Any way-change them.
A head gasket leak (blown head gasket) is highly likely. ($200)
Check your oil dipstick If it contains a milky fluid, that is water mixed with the oil. A sure sign of a blown head gasket.
Other symptoms of a blown head gasket include:
1. White smoke and excess water dripping out the tailpipe.
2. Overheatinmg engine
3. With radiator cap off, steam and water will erupt, sometimes violently.
Whichever tailpipe has the smoke is the side that the blown head gasket is located.
This is probably a head gasket problem and not an oil cooler problem.
The oil cooler is fairly easy to test.
Remove the cooler from the engine but do not disconnect cooling lines and then pressurize the cooling system. You can use a radiator test tool to put pressure on the cooling system and look for leaks. If it leaks, replace it.
You may also be able to bypass the oil cooler altogether if it leaks.
The head gasket is another story.
Get a 1/4" pipe to spark plug fitting and put a male air coupling fitting in it.
Then you can charge the cylinders with air from your compressor.
Make sure each cylinder that you test is at top dead center so that the valves are closed.
If air bubbles into your coolant, you found your problem.
If air leaks out your intake you have a bad intake valve
If air leaks out your exhaust you have a bad exhaust valve etc.
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the only way for engine oil to get into the cooling system at such a high degree is if you have a cracked block. even a blown head gasket doesn't allow that much oil into the coolant system. if the block was cracked it would be the water jackets around the cylinder walls. even a cracked head would not allow for this to occure. now if you don't have engine oil in the coolant but transmission oil instead via the trans oil cooler this would mean that the radiator has a crack in the tanks along the side where the coils of the oil cooler runs through it,(this only applys to vehicles that have an integral trans oil cooler). another thing that could occure is that the heads are cracked and the coolant is mixing with the oil in the upper oil galleys in the heads and then getting pumped through the intake into the bypass. if this were to occure your vehicle probably would not start at all and even if it did I seriously doubt it would stay running. You stated that you just had the head gasket replaced. well if the heads them selves were warped or the block deck was warped and they were not planed then a new headgasket would not solve the problem to begin with. My suggestion is to take it back to the shop you had do it and have them do it again because i believe someone screwed up because you did not have this problem before so the mechanic did not do something right.