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Case Tractors Discussion Forum
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VAC Project: Engine Oil Pump

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F-I-T

09-05-2003 12:17:57




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Before I button up the engine with new rings, all new valves and guides, and rod bearings, I have a question regarding the oil pump. Looking in the book, I see that there is a spring loaded relief valve. Do these springs give much trouble? Should I replace it? Should I try to measure the spring force on it? Or should it be dissassembled and cleaned?

This one has not run for a long time so I'm not sure what oil pressure to expect. The book says it should run around 10-14 psi running ( Boy ! that doesn't seem like much !), and I want to get every bit of that.

Thanks in advance for any suggestions.

Frank-in-Tallahassee
70D // 855 // VAC

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dctom

09-05-2003 12:23:05




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 Re: VAC Project: Engine Oil Pump in reply to F-I-T, 09-05-2003 12:17:57  
F.I.T, I would doubt that you would have any problems with the pump, yes a vac runs with 15 #of oil psessure, being the pump is so easy to get to a good cleaning wouldnt hurt any tom



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Jim M

09-07-2003 04:45:18




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 Re: Re: VAC Project: Engine Oil Pump in reply to dctom, 09-05-2003 12:23:05  
I also am working on a VAC project. The reason it was parked is because the oil pump went out and it spun a bearing. The pumps are trouble,and expensive to get from Case. I would take it apart and check the spring as you stated. While working on it take it apart and check the inside gear that is attached to the driven shaft for wear in the key. This key wears out and then no oil is pumped. That is what happened to my project VAC. I've worked n several other tractors with the same pump and have found several needing work. If you need to fix it I can help.

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Jim C

09-08-2003 17:24:38




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 Re: Re: Re: VAC Project: Engine Oil Pump in reply to Jim M, 09-07-2003 04:45:18  
Have a question for Jim M. Are these VAC pumps much like the ones in the older 530's? I have an early 530 utility version that runs anywhere from 6 Lbs to 15. I have also been told that these engines never had more than 15 Lbs. You say you can repair these pumps, like to hear more....Or should I not worry about it.



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Jim M

09-09-2003 17:35:37




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 Re: Re: Re: Re: VAC Project: Engine Oil Pump in reply to Jim C, 09-08-2003 17:24:38  
Those pumps that were in the VACs are like in the 148s and 164s. I'm not sure about the 159s. The service manuals say they are not servicable but if you take the cover off and drive out the roll pin that goes through the drive gear and drive shaft it can be removed. I used a hacksaw blade to make the slot in that gear deeper so I could install a higher woodruf key when my gear slot was worn and I lapped the gears on a piece of fine sandpaper sprayed with WD40 layed on a piece of thick glass for a flat surface to remove worn sides. I made sure they were the same thickness. I did notuse a gasket to put the cover back on but some high quality gasket maker, not silcone, to seal the cover. Don't forget to reinstall the roll pin. You may have to play with the surfaces of the pump cover and body to get the desired fit.

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