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Diesel over heating

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Charlie

12-17-2000 10:12:55




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I'm asking a question for a friend of mine - he has an Oliver 1500 diesel that over heats when doing any significant work. The tractor has very low compression for a diesel and thus a serious loss of horsepower. He has cleaned the radiator and removed the thermostat. He has replaced the head gasket and found small cracks in the head. He was told the position of the cracks were not a problem. It doesn't leak antifreeze. The tractor can run a hay bailer but it over heats pulling a 9 ft haybine and plowing is completely out of the picture. The engine needs an obvious overhaul but can this cause the tractor to run hot?

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klyde

12-21-2000 10:24:06




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 Re: diesel over heating in reply to Charlie, 12-17-2000 10:12:55  
if the head gasket is leaking compression into the coolant it will act like it is overheating but its just blowing the coolant out..... also small cracks in the head will do the same thing... 12 psi coolant pressure vs. 300-500psi compression pressure----compression WINS



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Adam

12-17-2000 16:08:34




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 Re: diesel over heating in reply to Charlie, 12-17-2000 10:12:55  
Removing the thermostat? I was told over and over by several seasoned oliver mecanics never to do this. Any way I'd also agree the timing could be off. Does the engine smoke real black under load? have you checked the gage for corectness? Is it boiling the coolent out? Good luck.



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LazyHorse

12-17-2000 12:51:13




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 Re: diesel over heating in reply to Charlie, 12-17-2000 10:12:55  
If the timing is off, or the valves are burnt could cause overhaeting, and loss of power. If the cracks in the head are loosing coolant, that could also be the cause.



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Charlie

12-17-2000 18:30:16




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 Re: Re: diesel over heating in reply to LazyHorse, 12-17-2000 12:51:13  
I'm not experienced with diesels and I don't know the expertise in this area of my buddy with the tractor but when you say timing is off, are you saying the fuel pump requires timing? The tractor smokes even with no load and has a bad sulfur smell in the exhaust.



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larry wolfe

12-18-2000 09:28:15




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 Re: Re: Re: diesel over heating in reply to Charlie, 12-17-2000 18:30:16  
Are you getting air bubles in the raditor? Or oil? Running a 1550 without a thermostat is not as big a broblem as a 1650 or 1800 would be, the larger tractor the thermostat blocks the bypass line as it opens.This is not the case with a 1550.



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goatee

12-17-2000 18:42:17




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 Re: Re: Re: diesel over heating in reply to Charlie, 12-17-2000 18:30:16  
Charlie, The timing is the distributor.It times the relation of spark advance to the piston relative to top dead center.The timing marks are usually on the pulley and the block,but not always.Consult your manual.Removing the thermostat is a bad idea.The coolant may not spend enough time in the radiator to cool adequately.Replace it with a new thermostat.You can buy additives to chemically clean the cooling system,then do a flush.then replace the thermostat and that usually does the trick.how big are the cracks in the head?you should definately replace it when the engine is overhauled.

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Steve in CA

12-18-2000 06:48:04




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 Re: Re: Re: Re: diesel over heating in reply to goatee, 12-17-2000 18:42:17  
Diesel's don't have distributors. Timing in this case is the diesel injection pump timing. It must be properly synchronized to the engine so that diesel is injected at the appropriate time. I do agree running without a thermostat is a bad idea.



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gary

12-20-2000 13:18:30




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 Re: Re: Re: Re: Re: diesel over heating in reply to Steve in CA, 12-18-2000 06:48:04  
How about the air filter / air intake - any blockage ?



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