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MF 165 Diesel Oil pressure

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Brian

07-25-2001 11:00:45




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Just started on the cleanup of a Diesel 165 MF, I changed the oil of unknown viscosity to Rottella 30 weight. I changed out the old filter and filled it with oil as I replaced it. Started tractor and got no oil pressure within 10 seconds so I shut down. Tried this a couple of times at intervals but still no oil pressure. My question is do you have to prime these oil pumps or did my gauge crap out at this time or should I let it run longer to get pressure? Prior to the oil change the gaug

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Ralph

07-29-2001 10:41:30




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 Re: MF 165 Diesel Oil pressure in reply to Brian , 07-25-2001 11:00:45  
What brand of oil filter did you install? A few years back, I helped a farmer who owned a MF135 or 165 that had a similar problem after changing oil. Removed filter and discover that the filter he had installed was designed for a different application. He had purchased the filter at an auto outlet store. The filter was designed for a different oil flow that required that the oil enter the center of the filter and travel through the filter pleats. Perkin engines are designed different, the oil enters to the outside, travels through the filter pleats to the inside of the filter. The fold of the filter pleats will only allow oil to travel in one direction. If the filter flow does not match the flow of the oil for the engine, these filter pleats restrict the oil flow. I have seen this happen with several Cat engines where the filter was not designed for that application. The brand names on these filters were usually auto store outlets. If someone uses these filters, it is a good ideal to notice how the filter is constructed internal. If the outlet is the center of the filter, one will notice a round tube in the center filled with holes to allow oil to travel through. This tube supports the filter pleats while oil under pressure is forced through the pleats. On filters with the opposite flow, they usually will not have this tube. Hope this might help! Ralph

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Graham

07-29-2001 01:24:00




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 Re: MF 165 Diesel Oil pressure in reply to Brian , 07-25-2001 11:00:45  
It seems unusual that the guage and pump would fail together. Maybe you made an error in reassembling the filter and the oil cannot get thru. Pumps usually don't die suddenly unless something breaks. Was the old oil much thicker than the new oil??, if so it might partly explain the sudden drop in pressure. I hope this helps, it seems an unuasual one. Best of luck. Graham Vayro



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Bill

07-25-2001 17:48:17




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 Re: MF 165 Diesel Oil pressure in reply to Brian , 07-25-2001 11:00:45  
HI, Pull off the oil filter and see if it has oil in it. Most engines the pump has to fill up the filter to get oil pressure. I know from experience if you fill the filter with oil the pressure comes up imediately after an oil change. Bill



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Big Jim

07-25-2001 14:51:15




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 Re: MF 165 Diesel Oil pressure in reply to Brian , 07-25-2001 11:00:45  
Brian,

Unless you are installing a new oil pump or taking out your existing pump for repairs, you should never need to prime an oil pump. Changing oil does not effect a pump as they always retain a small amount of oil for prime.
As far as oil pressure goes, it is normal for tractors to wait a few seconds before building up oil pressure, especially if you are using heavier oil. Is there any knocking or other unusual noises? Also, you are right about oil gauges, often the only problem is a faulty guage. You can get a generic oil gauge new for around $15-$20.

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Brian

07-25-2001 16:53:01




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 Re: Re: MF 165 Diesel Oil pressure in reply to Big Jim, 07-25-2001 14:51:15  
Thanks for the info Big Jim. I took off the sending tube at the left side of the engine and started her up this afternoon but no oil came out of the sending hole within 20 seconds or so. It seems odd that if the oil pump went it was at the same time I did an oil change. I thought I would screw on a fitting with a tube and inject some 30 W oil down the sending unit to clear any blockage in the passageway and send some up the tube to the oil pressure gauge on the panel to check its operation. If that doesn't work I'll be pulling the pan off and putting in a new pump. How big of a deal is that? I've got a manual and it looks like it should be not too much o

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Big Jim

08-06-2001 14:06:55




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 Re: Re: Re: MF 165 Diesel Oil pressure in reply to Brian, 07-25-2001 16:53:01  
Brian,
Sorry about the time gap. I have been out of town for over a week. To change the oil pump itself isn't a big deal, however you have to remove the oil pan. On a Perkins motor, this means you will need to split the tractor (you've probably already figured this out by now). Inspect the pump carefully, any scoring on inside of the pump where the gears run, means it will need to be replaced. Hope it was just the oil pressure guage!

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