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Tractor Talk Discussion Forum

John Deere 435 diesel oil pressure problem

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cdm

06-04-2006 16:56:23




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John Deere 435 diesel starts with good oil pressure, but drops to almost zero after about 15 minutes of mowing. First I added a manual gauge at the tee under the oil filter canister. Waited a day, ran tractor again. Both gauges dropped to almost zero after 15 minutes. Next I dropped pan, removed and checked screen, removed filter. Everything was very clean. Filter in the canister was a Hastings LF 101. Does anyone have any suggestion what I might try to do to correct this erratic pressure?
Thank you in advance

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Jerry/MT

06-04-2006 21:12:08




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 Re: John Deere 435 diesel oil pressure problem in reply to cdm, 06-04-2006 16:56:23  
I don't think you have a problem with "erratic pressures" because you are consistently getting the same pressure history. Assuming you are using the right motor oil,y our problem is most likely wear. I used to have a 435 with plenty of hours on it but an unknown history. It had an oil pressure gauge mounted in the line going into the oil filter. It was one of those non-numbered gauges but it never went below the middle of the gauge. I think you need to consider replaceing the mains and the rod bearings. They're probably badly worn.

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Jerry/MT

06-04-2006 21:10:45




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 Re: John Deere 435 diesel oil pressure problem in reply to cdm, 06-04-2006 16:56:23  
I don't think you have a problem with "erratic pressures" because you are consistently getting the same pressure history. Your problem is most likely wear. I used to have a 435 with plenty of hours on it but an unknown history. It had an oil pressure gauge mounted in the line going into the oil filter. It was one of those non-numbered gauges but it never went below the middle of the gauge. I think you need to consider replaceing the mains and the rod bearings. They're probably badly worn.

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the tractor vet

06-04-2006 17:09:07




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 Re: John Deere 435 diesel oil pressure problem in reply to cdm, 06-04-2006 16:56:23  
Rods , mains and cam bearings and maybe a new oil pump. in other words it is time to take her down and do a major over haul . Now are you running the correct oil in a Detroit ??? they don't do well with a 10-30 they need a 30 weight seires three oil this may help . The older 2 stroke detroit was one that did not carry much over 40 lbs wide open and down to 10 -20 at idel .



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buickanddeere

06-04-2006 17:05:55




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 Re: John Deere 435 diesel oil pressure problem in reply to cdm, 06-04-2006 16:56:23  
It's a bypass filter if the factory system is still there. Oil pressure at the crank mains won't change no matter if the filter is clean or 100% blocked. How many hours? How does it start? Does the oil pressure go down as the coolant temp goes up? What weight and brand of engine oil is being used? Some somebody done an "overhaul" on this engine and installed 10 thou under bearings on a standard crank?

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Jon Hagen

06-04-2006 21:14:04




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 Re: John Deere 435 diesel oil pressure problem in reply to buickanddeere, 06-04-2006 17:05:55  
I think B&D means std bearings on a 10 under crank. 435,is that the one with a 53 series Detroit? If so run the engine with the valve cover removed to check for fuel leaks at the injector lines. watch for fuel washing oil off the top of the line nuts. A cracked flare on these lines is not that uncommon,especially if someone tightned them a bit too much,this will pump fuel in the engine oil. Does the engine gain oil,or the oil smell like fuel? Fuel washing may also be part of the reason for the engine being very clean inside.

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buickanddeere

06-05-2006 07:24:36




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 Re: John Deere 435 diesel oil pressure problem in reply to Jon Hagen, 06-04-2006 21:14:04  
You are correct a standard bearing on a 10 thou crank. I should't write while doing night shifts. If rebilding a N series piston and injector update kit needs to be used. New vavles and seat or the compression pressure will always be low due to sunk valves. An updated spring kit should be used on the valves and cam followers. The blower end plate needs to be machined with a cutter and new style oil seals installed.

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