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Oil Pressure Concerns

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Chris Engler

06-17-2001 19:58:11




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I recently purchased a 1969 MF 135 with a Perkins gas engine. The engine runs fine and does not appear to be burning oil. On cold start, the oil pressure gage is approximately 75% full scale (no pressure numbers on gage). Over a period of about an hour while using a 6 ft. brush hog, the oil pressure will fall to approximately 15% of full scale - at low throttle settings, the oil pressure does not register. I've changed the oil to straight 40 wt. and installed a new temperature gage. The coolant temperature remains constant at 150-160 degrees F. throughout the entire period of operation.

Thanks for the help!

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bryan Lunt

06-25-2001 20:54:29




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 Re: Oil Pressure Concerns in reply to Chris Engler, 06-17-2001 19:58:11  
Alexander is probably correct but I wonder if the small ends of the rods are splash fed? If so they would be OK. The big ends and mains would solve it but only a cheapskate would be foolish enough to work on the bottom end and fail to rebuild or exchange the oil pump. All that work and a few months later the pump fails? Uggh! Make sure you replace all and every locking tab!



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Greaseman

06-18-2001 17:29:31




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 Re: Oil Pressure Concerns in reply to Chris Engler, 06-17-2001 19:58:11  
I think it's time for an overhaul, try the compression test first, then plan an overhaul.



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smokey

06-18-2001 16:03:38




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 Re: Oil Pressure Concerns in reply to Chris Engler, 06-17-2001 19:58:11  
I have the same problem with a Daihatsu diesel 4X4
I have found Shell helix for older motors to be a short term solution. Seems to really fill up the loose bits. Best of all, in Australia, I can buy it in my local supermarket. Penzoil put out a similar product but it is inferior compared to Shell.
You need to be careful using a detergent oil as opposed to non detergent oil in older engines.
The Shell helix older motors formula appears to build up a layer on the motor. It is not recommended for low temperature areas but in Aussie land works just fine.

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matt

06-18-2001 14:52:42




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 Re: Oil Pressure Concerns in reply to Chris Engler, 06-17-2001 19:58:11  
I had a Farmall A with very similar symptoms. Turned out to be that the plate at the bottom of the oil pump was warped slightly. I set it gently on a belt sander to take a little metal off added a new gasket to ensure a good fit. Oil pressure then stayed at the 75% range.



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D.Gill

06-18-2001 13:39:45




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 Re: Oil Pressure Concerns in reply to Chris Engler, 06-17-2001 19:58:11  
I agree with Alexander. It's time for an overhaul.
I have a 135 with a gas Perkins. I have about 250 hours on a major overhaul because the previous owner changed the oil, didn't tighten the drain plug and ran her out of oil. Anyway since the overhaul the oil pressure runs near the top of the guage and remains there at all rpm's and temp's.



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BlueLite

06-18-2001 12:44:48




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 Re: Oil Pressure Concerns in reply to Chris Engler, 06-17-2001 19:58:11  
The gas continental on my massey is supposed
to run at 15 lbs out of the factory. My manual
says don't run it under 7 and I'm at 10ish. It burns (not smoke) a bit after a day's
long pull and I could lose 1/3 quart. All in all
I think I'm doing good. I'm going to improve that
by going synthetic on the next change. You should install any cheapo gauge to at least indicate a ballpark pressure, and if it runs at around 10 hot and continuously I wouldn't worry about it.

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JMB '62 MF35 Perkins

06-18-2001 07:28:55




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 Re: Oil Pressure Concerns in reply to Chris Engler, 06-17-2001 19:58:11  
You might use some oil additive with Molybedenum Disulfide (MoS2) to reduce friction and prevent further wear. JC Whitney used to sell the additive in an oil based suspension. I have purchased it in the past in powder form and then mixed it in oil, then added it while the engine ran to ensure it got distributed in the engine without settling out. I had a noisy throw out bearing on a Honda, and this quited it down completely. When I got around to rebuilding the transmission later, you would not believe the condition of this bearing that was quieted by the moly. All the additives at the local parts stores are teflon based and not as reliable or don't hold up under heat and pressure. The moly will coat the bearing and other wearing surfaces as well, and not get completely flushed out at the next oil change like teflon.

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Randy

07-07-2001 02:19:21




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 Re: Re: Oil Pressure Concerns in reply to JMB '62 MF35 Perkins, 06-18-2001 07:28:55  
The MoS2 you talk about can be bought in Canada(I hope the U.S. and elsewhere too) as a product called Moly-Slip. It's been around for at least 40 years and I know people who swear by it. We can get it at Wal-Mart,and Canadian Tire stores, and auto parts stores.



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Skeptic

06-23-2001 21:47:58




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 Re: Re: Oil Pressure Concerns in reply to JMB '62 MF35 Perkins, 06-18-2001 07:28:55  
Do you put the additive in the engine oil or the transmission oil to get it to the throw out bearing?



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John Bailey

06-24-2001 20:03:35




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 Re: Re: Re: Oil Pressure Concerns in reply to Skeptic, 06-23-2001 21:47:58  
I added it to the gearbox oil and within a few days it was starting to quiet down. The best place to get it was JC whitney in the past, but I got the powder from an industrial supplier west of Fort Worth around 1990. The big advantage off MoS2 over teflon is the pressures and temperatures it can withstand, and thus it is commonly used in manual transsmission gearboxes that need help.



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Alexander

06-17-2001 23:33:36




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 Re: Oil Pressure Concerns in reply to Chris Engler, 06-17-2001 19:58:11  
New rod and main bearing will fix this.



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