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Ken in Texas 
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Joined: 11 Sep 2009
Location: Henderson, TX
Points: 5919
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 Topic: Too much oil pressure?
Posted: 27 Nov 2009 at 11:44pm |
Been messing with a completely overhauled B that was showing a maximum of 10 lb reved up on a good S&W gauge. On a white face Allis gauge it almost didn't get in the normal box. Split the tractor again and replaced the oil pump relief ball and spring. The spring was almost worn thru from rubbing the housing. Ball didn't look that bad. Didn't have the right replacement spring and the one used was a bit stronger. Now it pegs both gauges at fast idle and the S&W has a 50lb range.
Is this a case of more is not better? Don't really want to split tractor again.
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Wes (VA)
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Joined: 12 Sep 2009
Location: Elkton, VA
Points: 510
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Posted: 28 Nov 2009 at 12:09am |
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I wouldn't say that it would hurt the running/internals of the engine, but I would worry about something starting to leak from a blow-out such as the gauge, or the gasket at the filter base. Or elsewhere that that pressure will be applied. The pump gasket itself may develop a leak?? from not being able to unload... not really sure how much it would be able to stand, but if it was mine I would probably change it again. -Wes
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Jack(Ky)
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Joined: 12 Sep 2009
Location: Ky
Points: 1153
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Posted: 28 Nov 2009 at 5:53am |
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I did the same thing a long time ago. It worked fine til the weather started cooling down and the oil filters started turning in to basketballs. You might as well go back and fix it now and get it over with. The low pressure won't hurt it as long as you use a good grade of oil. I would run Rotella oil in it because it takes alot more heat to thin it out than most oil. My problem started when I put on an 80 lb S-W gauge and it wouldn't read anything when it got hot. The normal range is only about 15 lbs. If it has good pressure when you first start it up it will be fine.JP
Edited by Jack(Ky) - 28 Nov 2009 at 5:58am
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Ken in Texas
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Joined: 11 Sep 2009
Location: Henderson, TX
Points: 5919
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Posted: 28 Nov 2009 at 6:26am |
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BrettPhillips
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Joined: 11 Sep 2009
Location: Strasburg, VA
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Posted: 28 Nov 2009 at 8:55am |
Ken: On most engines, that wouldn't be a bad problem but the B/C/CA engines are an odd duck when it comes to the oiling system. The rod and main bearings only get what leaks past the relief valve, so it is not a bad thing to have leakage at the relief valve. The gauge just indicates the pressure of the oil going to the rocker arms and filter, so it is really just an indicator of whether the pump is working. Regarding where to buy the springs, I have had good luck with Sandy Lake Implement. I don't remember them being outrageously priced.
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Gary
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Joined: 13 Sep 2009
Location: Peterborough,On
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Posted: 28 Nov 2009 at 11:00am |
I thought the rods only got oil from being sprayed through space from holes in the camshaft.
Where are you Dick L ?
Gary
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Dick L
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Joined: 12 Sep 2009
Location: Edon Ohio
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Posted: 28 Nov 2009 at 3:08pm |
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You are correct Gary, but the heavy spring keeps the oil from getting around the ball to get down the center of the camshaft to get (sprayed) onto the rods. The oil would be shut off to the camshaft bearings which in turn shuts the oil off to the mains.
The assembly lube will not last long with the heavy spring. At 50 pounds pressure some oil might get by the ball but not much with a a low volume vane pump.
Edited by Dick L - 28 Nov 2009 at 3:14pm
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Ken in Texas
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Location: Henderson, TX
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Posted: 28 Nov 2009 at 3:36pm |
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Well B751 got split and is back together and the oil pump is now reading smack dab between the N and R in NORMAL. Put the old spring back in with a little dab of stretch. Glad I asked and thanks a bunch for expert advice. I sorta rembered awhile back DickL explaining how the oiling system in the small AC 4 cyl engines works and figured they were designed for low pressure readings at the gauge for a reason.
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weiner43
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Joined: 12 Sep 2009
Location: Lake City, Mi.
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Posted: 28 Nov 2009 at 3:47pm |
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I put a stronger spring in a Mopar 340 once and blew the filter right off the engine.
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God bless our troops and the United States of America.
Pick your rut well, you may be in it a long time.
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Coke-in-MN
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Joined: 12 Sep 2009
Location: Afton MN
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Posted: 28 Nov 2009 at 6:13pm |
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Thats the difference between a full flow system and a by-pass system . On newer engines all oil from pump hits the filter first then to engine , in by-pass only excess oil is filtered. Most full flow will bypass oil if filter plugs but the can on them will only hold so much pressure.
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Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."
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