Question about 1976 Cadillac Eldorado
I am sure the fault lies in the last part of your observation. No matter what cooling is done if the engine does not have a smooth friction less operation specially when it is working at such high rate , the heat will only build up.
If there is slapping of the connecting rod /piston rods, then THIS SEEMS TO BE THE IMPORTANT ISSUE. Your engine is not smooth, the oil pressure gets down as there is gap in the connecting rods and thereby even to the crank. So the low oil pressure will reduce lubrication and this will keep on building up heat as the rods are SLAPPING and not moving smoothly.
I suggest that the engine be taken out and the connecting rods/piston pins be reset with correct bushes and sleeves.ONLY if the engine builds up the oil pressure does the heat reduce as there is less friction of movement.
You must also check the compression and cylinder bore for perfection. If not this is also very much important to help the engine develop the power or an underpowered engine will ONLY overheat.
Other wise you have observed the faults well but this is my suggestion before you spend on an expensive radiator --- which can be tired from a swap so as to confirm this issue.
Posted on Apr 11, 2011
I had one of these and it never overheated,so lets look at the tests.
1.Has it ever overheated prior to this?
2.check the viscous fan unit on the water pump if your model has this..It should be pulling the heat off the radiator when running at temperature.If it is still free spinning easily when you turn off the engine,replace it.Usually as they leak out dust forms at the center of the hub where seal is.
3.If it is either the above or a fixed fan,does it have the shroud on the radiator that allows the fan to draw the heat off effectively.
4.Is the fan pulley the correct diameter for fan speed?(has it been changed)
5.If electric fan(s) fitted,are they coming on at all?
perhaps if you don't have an electric fan and all else mentioned checks out,you could fit one on a switch as a precaution.
I hope this helps you solve this,if not get back to me with your findings.
Posted on Apr 10, 2011
This would pose question on the quality of the rebuilt done. Normally on a quick rebuilt, it may be an issue with the clearance of the cylinder wall and the piston. I would think that this is a problem with the piston skirt, normally you would get a knock. A heavier sound would lead to the bearings (but would get louder as the temperature increases) and while a fast one would most likely be the piston. If it is a tapping noise, it could be the valve lifts or you may have to change the rocker arm or it could be as simple as oil sludge that has built up.
The temperature may be related to the issues above as they would produce friction and in turn heat. The basics need to be checked such as the water pump. Check if you have white smoke, you may be burning coolant.
Posted on Apr 10, 2011
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Posted on Jan 02, 2017
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