Isuzu engines/running temps
	
	
		
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				Originally Posted by 
Larns
				
			 
			The proper thurmostat temp is 82. That's what the workshop manual states.
I do recall someone saying that the Isuzu is very dependent on the temp being right. I would belive the higher cylinder temp would be more desirable as 76 is bloody cold for a diesel
 
Hope this helps
			
		
	 
 1. Larns is right - the standard factory thermostat for a 4BD1/T is set at 82 degrees C - it is possible to get a factory 84 degree unit. According to Isuzu it is very important to keep operating temp under about 95 degrees C to avoid pistons picking up in the bore. My 4BD1T runs at 79-85 degrees and ususlly settles at about 82 after running for an hour plus.
2. Re the later Isuzus - I have heard of a 4HE1 being fitted to a 110 in Perth - the main problems are adapting the engine to the gearbox, and the fact that the exhaust exits on the right hand side of the engine. Height might be a bit of an issue.
3. Legalities. The situation varies from state to state. I had no problems getting approval of the 4BD1T conversion of my Defender (in QLD). The engine must comply with the ADRs relevant to the ADRs the vehicle was built to comply with. As far as I know this means the cut off for using a 4BD1/T is a 300Tdi DEF/Disco - any thing earlier is not an issue. TD5s were built to later ADRs and therfore would be difficult to get complianced.
I trust that this helps
Christopher