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Oil pressure dropping

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Joe in MI

12-29-2007 10:54:36




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Sorry for the long post - I thought it best to give as accurate a description as possible, to keep "mind reading" to a minimum. third party image
I just came in from about 2 hours of plowing snow with my 51 8n (sidemount) My oil pressure typically runs 35 to 40 pounds. Today I noticed that when I stopped quickly while going in reverse, the oil pressure would drop to 0. A few seconds later the oil pressure would return to 35 or 40 pounds.

At first I thought it was a bad gauge, since I didn't notice a change in rpm that correpsonded to the drop in pressure. Then I noticed a little clattering noise that started a few seconds after the pressure dropped to 0. The clattering stopped as soon as the pressure returned to normal. The pressure always returned almost immediately - a second or two, but once in around 8 seconds. The clattering was only there for a few seconds.

This happened every time I stopped after pushing snow backwards with the back blade. It took a somewhat abrupt stop to cause it - I'm not slamming into the pile, just a normal stop when piling up snow. I could avoid it by sloooowly coming to a stop.

I noticed the clatter before, but thought it was the radiator - it rattles a little. I'm usually looking over my shoulder when backing up, which explains why I never noticed the gauge drop before.

It also seemed like I lost a little power today. It's hard to say, though. I was pushing between 8 and 10 inches of snow, which I've never done with this tractor before.

I've got plenty of oil - it's exactly at the halfway point in the "safe operating range." I just changed it and put in 15w40 this summer. It used to puff a little out the breather cap, but that stopped after I cleaned the cap and changed the oil. It also puffs a little blue smoke when it starts and under heavy load. It doesn't burn enough oil to notice a change on the dipstick, though.

Also - plug #4 fouls pretty fast - I didn't check it today, but it sometimes gets COVERED with wet nasty burnt nastiness. The other three plugs look perfect.
Any ideas on what I'm looking at here?

Thanks in advance

Joe

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Joe in MI

12-31-2007 07:20:40




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 Re: Oil pressure dropping in reply to Joe in MI, 12-29-2007 10:54:36  
Thanks for the input guys. The drain plug doesn't have a screen on it. I got a new one for Christmas from my lovely wife, so I'll put that on when I change the oil. I never considered that the dipstick might be incorrect. When I change the oil I'll check the tube out.

Again, thanks for the input. Have a safe and happy new year!

Joe



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JMOR

12-30-2007 07:20:54




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 Re: Oil pressure dropping in reply to GB in MT., 12-29-2007 10:54:36  
Would need to be steep enough hill to have crank splashing oil in order to get oil level up to tube/pump junction.third party image



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corvetteguy

12-30-2007 04:12:02




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 Re: Oil pressure dropping in reply to Joe in MI, 12-29-2007 10:54:36  
I get the same loss of OP when
my 9N is going down hill.
I would think the oil is going to the front of the engine where
the pump is.



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8N1949

12-29-2007 11:58:15




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 Re: Oil pressure dropping in reply to Joe in MI, 12-29-2007 10:54:36  
I would second Bob's comments. When you did the erupt stop, backing when moving the snow, you cause the oil in the pan to suddenly move to the rear and forcing it towards the front of the engine in a rapid force. Therefore, when this happen, the oil pickup tube may have bounce hitting the bottom of the oil pan causing it to break loose, or to the point, it broke the weld.
The way this oil tube was engineered/designed, it is noted to do just as we have described.

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Bob

12-29-2007 11:06:54




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 Re: Oil pressure dropping in reply to Joe in MI, 12-29-2007 10:54:36  
ASSUMING you have the correct dipstick, and the pan is properly full of oil, it sounds as if the oil pickup tube is cracked or broken loose from the oil pump.


You can take the oil drain plug out, and verify the screen on the drainplug is clean. Then, when the oil has finished draining, poke a finger up in the drainhole, and see of you can wiggle the oil pickup tube around, indicating a cracked tube, or a broken solder joint.

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