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Has anyone ever seen a situation where they have oil in the water but not any water in the oil?
After a month plus of running down a problem were my '49 would start to hesitate and die when hot, we found the problem.
There is oil in the water. We pulled the head and the rear three cylinders all show purple/blue hot spots opposite the valves. The head also is cracked along that side as well. Long cracks running cracks.
The odd thing is the compression was 100-105-80-85-105-105. The worst cracks and heat checking were on #5 and #6 but #3 and #4 had the low compression.
I am hoping that the problem is all due to the head and that the block is not cracked inside between the oil gallery and the water jacket.
I have a spare head. It is going on. I am going to surface the intake/exhaust although it looks good with a straight edge.
The really odd thing is that the temperature gauge never showed a hot engine, nor did the engine ever get that smell/sound of one overheating. We tested the gauge with a calibrated thermometer and it is operating fine.
The only theory we have is that oil got into the cooling, by a way we do not know, and the oil emulsified and coated the rear of the cylinder head cooling system and "insulated" the gauge bulb and the rear floor of the cooling jacket on the cylinder head. This caused the over heating and prevented a correct reading of the temperature.
If anyone has ever seen oil in the water without water in the oil, then please let me know if you figured out how it happened.
Thanks, James
Doesn't sound good James. I doubt if the problem, as far as oil getting into the coolant , is in the head since there is no oil pressure up there. It has to be where an oil galley is near a coolant passage which would be in the lower half of the block.
Tim Mabry
The Lost Cause Garage
47 Suburban
57 Sportsman 4dr HT
Doesn't sound good James. I doubt if the problem, as far as oil getting into the coolant , is in the head since there is no oil pressure up there. It has to be where an oil galley is near a coolant passage which would be in the lower half of the block.
Tim,
I suspect you are correct.
However, I talked with a machinist the other day that said he has seen this in a car where there is some Blow-By and the Blow-By with the oil in it is "pushed" through the crack into the water jacket.
Also, I found some guys on a tractor forum that has the same problem with a inline flathead.
So, I am hoping that it is some kind of cascade failure that I do not understand and with a new head it will go away.
Hope springs eternal. At this point I have very little to loose but some time.
Wish me luck.
James
