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Re: The plot thickens on '66 4500 diesel in oil...

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07-20-2013 23:25:59

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If the damn thing is holding 70 pounds when it's hot then you clearly don't have any fuel in the oil. If it was diluted to any extent the pressure would be more like 15-20 at WOT when it's hot.


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07-21-2013 09:31:57

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 Re: The plot thickens on '66 4500 diesel in oil... in reply to RodInNS, 07-20-2013 23:25:59  
Yes, I understand that. What was a doubt in my mind was whether or not the original oil pressure gauge was accurate or not. I have no knowledge of this tractors prior history other then the prior owners sales pitch when he sold it to me. Have found some of what he said was true and some not so true. As expected. When you start the tractor it jumps right up to 70lbs and stays there. Stays at 70 even at low idle. In my naive experience I was concerned the gauge was inaccurate. Knowing now that is correct I have ruled out my oil "gain" is diesel. That is a relief. So, as other posters have suggested, time to look at the power steering pump which is supplied by the hydro reservoir on this "66 4500.

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07-21-2013 10:00:56

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 Re: The plot thickens on '66 4500 diesel in oil... in reply to petetherookie, 07-21-2013 09:31:57  
Actually, if you want to get technical... the oil pressure gauge isn't original. Originally, it never had one to begin with.... only an idiot light in the gauge cluster. As far as I'm concerned that's as useful, if not more useful than the gauge.
I'd also say... if you've never seen diesel mixed with engine oil... it's not really something you need wonder about. I had it happen a year ago on a Detroit 3-53 and in two hours it dumped the better part of a tank of fuel into the base. I think we drained off 2-3 buckets on the change. Oil pressure was nil at idle and mabey 20 at full throttle. So if you got fuel in the bottom, you'll know it. Quickly.
PS pumps were very common failures on those tractors. That's the more likely scenario. If you get it before it buggers the pump you may get away with changing the shaft seal. If the bushings are bad, you need a pump.


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