Question about 1992 Daihatsu Charade

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Diahatsu 93 with Oil in cooling system

Thanks Chasda.
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.
cheers kmacca

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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.

You make like to try joining Daihard to see if any of the members have sorted a similar problem. You must put a city/country location and a valid email address in the registration to be a member.

Posted on Oct 06, 2008


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Water detected in sump would it come from the oil cooler

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You may also be able to bypass the oil cooler altogether if it leaks.

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Get a 1/4" pipe to spark plug fitting and put a male air coupling fitting in it.

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Oil getting into radiator/cooling system

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.

Oct 05, 2008 | 1992 Daihatsu Charade

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