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A mate had a D1 with the 300 motor and suffered overheating problems. Mechanics diagnosed cracked head or block and mega bucks to fix. Finally found the thermo fans were not working properly, replaced, and had no more problems until sadly he passed away.
Over heating isn't the problem generally , eventually the air lock causes melt down .
The motor does not slowly get hotter , the air lock stops the cooling system working .
Viscous coupling has also been changed .
The third motor was from turners in UK just to eliminate any possibility of a cracked block etc .
When my muffler caused overheating, it was intermittent. The muffler would be fine, then something internal would move, causing a sudden overheat situation.
I have suggested to the OP to have a chemical test done on the cooling system to see if there is any hydrocarbons showing up.
I suspect the answer will be a yes. Preferably get the test done by someone that has no history with the engine.
For that matter the OP could buy a kit from their local parts place and do the test themselves.
I would have given up after the 2nd engine and stuffed a 4BD1 in there and called it done.
I had the same thought , but I am too far down the hole .
I had the test done by a local shop with no prior involvement . He used a colour change liquid tester for over 1/2 hour on the workshop floor , idle , revving hard etc , result was negative .
Diesels are a lot harder to test for combustion gases.Quote:
Originally Posted by dero
We have tested a couple that we essentially knew were gone and they came back negative. One was literally filling the radiator with gas and it wouldn't show. On the test, it didn't get hot either, just blew all the water out of the radiator.
Head gasket was gone between 2 cylinders on the fire ring.
No guarantee that's your problem, but a negative test is not conclusive either.
At the end of the day you should be able to Sherlock Holmes it:
"When you have eliminated the impossible, whatever remains, however improbable, must be the truth"
It's either combustion gases or air, there's no other options to my mind, I cannot think of any way that air can get sucked into the system unless there is a radiator flow restriction on the way into the pump and the pump is sucking air in somehow.
I've never heard of that myself and think it's extremely unlikely.
So you are down to 1 option....