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Subject: Oil pressure

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Rich    Posted 05-04-2020 at 05:43:07 [URL] [DELETE]        [Reply] [Email]  
  • Oil pressure
  • When i start my tractor the oil pressure is around 50 PSI on gauge. It has new oil and i was told to use 10W30. The oil has been changed twice with in the last 6 months.Most of the time when i drive it the pressure stays around 30 PSI when its hot. The other day i drove it and my oil pressure when the tractor was hot on idle i had no oil pressure on the gauge. Only when i raised the RPM did the pressure go up. my question is do i need to rebuild the pump its just gears or d oi need to use heaver oil.

    John-mi    Posted 05-04-2020 at 16:58:21 [URL] [DELETE]        [Reply] [Email]  
  • Re: Oil pressure
  • Your carbuerator may have leaked gas into your crankcase enough to thin out the 10w30 oil enough to not register enough at idle.

    Dn-N-Tn    Posted 05-05-2020 at 10:03:37 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Oil pressure
  • Also, smell the oil on the dipstick---you can usually smell gas in the oil. I might add that the oil pressure is checked on the 9N/8N engine at the rear of the engine (oil pump is at the front), after it has gone through the bearings, relief valve, etc.---then the line to the gauge is teed off to the filter where it is bled off back to the crankcase. Just think about it---a SBC or SBF engine oil pressure is gauged right off the oil galley at the oil pump. I think this is one reason why the oil pressure appears to be so low at an idle on the tractors. Crack the line open at the gauge and I'll bet you still have plenty of flow, Dennis.

    Tim Daley(MI)    Posted 05-05-2020 at 08:59:41 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Oil pressure
  • Or water/coolant. What does the dipstick look like and register?

    TPD

    TheOldHokie    Posted 05-05-2020 at 04:45:06 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Oil pressure
  • Now that's an interesting possibility. Easy to check and fix if its the problem.

    TOH

    duey    Posted 05-04-2020 at 13:19:34 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Oil pressure
  • What model of tractor? Have you changed/checked the gauge? Engines don't normally lose pressure between starts....

    Seems like a number of things to CHECK before jumping to an expensive overhaul...

    Free advice is worth what you pay for it, just sayin'....

    Tim Daley(MI)    Posted 05-04-2020 at 08:39:40 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Oil pressure
  • Oil pressure is normally 27 PSI hot at idle. As the engine gets worn, pressure will register lower. Minus 10 PSI is getting bad, 5 PSI or less is dangerously low. Rebuilding the pump and changing the oil won't affect that much. When was the last time you tore down the engine for a rebuild? It's time again.

    Tim Daley(MI)

    Rich    Posted 05-04-2020 at 08:48:04 [URL] [DELETE]        [Reply] [Email]  
  • Re: Oil pressure
  • Tim
    I bought the tractor used so I don"t know if it ever was torn down and rebuilt.
    I can tell it is getting oil. The push rod covers leak oil so i know it getting up to the head. As for the oil is the 10w30 ok or should i use a different weight.

    Thanks Rich

    Tim Daley(MI)    Posted 05-06-2020 at 06:31:33 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Oil pressure
  • All good answers given and as Duey said, do some more investigating before you tear down the engine for a rebuild. Your oil grade is used by many and is adequate, but grade isn't your problem anyway. Gauge readings bouncing up and down are not normal. There is much data given on oil -do an archive search for 'oil TOH' and read the many posts from days gone by. You can also try to crack the oil line fitting loose when it drops and see if there is oil getting to the line. If running OK have you done a compression test?

    Tim Daley(MI)

    Rich    Posted 05-06-2020 at 13:04:19 [URL] [DELETE]        [Reply] [Email]  
  • Re: Oil pressure
  • Tim
    No i haven't done a compression test on it . The tractor has been doing great for a while. This just happened all of a sudden. I was informed that there is a pressure relief valve on the front cover i never looked at the spring might be warn or broken. There are thing i will look at.

    Thanks RIch

    TheOldHokie    Posted 05-04-2020 at 13:51:35 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Oil pressure
  • Your 10W30 grade is fine and right on line with Fords viscosity recommendations. Dont waste your time changing oil - that is not going to fix your problem.

    Hot oil pressure of 30 PSI is better than most and a good indicator internal clearances are pretty tight. No point in even thinking about rebuilds based on that.

    Something happened to cause the oil pressure to drop suddenly and it almost certainly isn't massive wear.

    I would suspect an obstruction in the pickup tube or a loose connection at the pump. Another possibility would be a partial oil pump failure of some sort. The oil pressure comes up with RPM and something is limiting pump flow. Time to do some sleuthing at the drain plug looking for those sorts of problems.

    TOH

    Rich    Posted 05-06-2020 at 13:07:48 [URL] [DELETE]        [Reply] [Email]  
  • Re: Oil pressure
  • The Old Hokie
    Thanks for the info. I will look at a few things before i do anything crazy. I just found out there is a pressure relief valve on it i will check the spring it to see if it warn or broken. thanks for all the input.
    Rich

    John in Mich    Posted 05-04-2020 at 10:04:45 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Oil pressure
  • Personally, I have never used a 10w anything in any of my Ns. I use straight 30w HD in the summer and a straight 20w in the winter. Has worked for me for 60+ years. Your experience may vary.

    Rich    Posted 05-04-2020 at 11:39:54 [URL] [DELETE]        [Reply] [Email]  
  • Re: Oil pressure
  • Thanks John
    Will try that and hope it works for me i though the oil was too lite for that tractor.

    Rich

    Buddy    Posted 05-04-2020 at 06:46:51 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Oil pressure
  • It's getting tired.

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