MF-165 Injection pump leak

dlinmi · Sep 4, 2016

My diesel 165 is leaking fuel from around the stem of the throttle post. Where the throttle linkage connects. What is the cause and fix? I believe the o-rings are also leaking a bit where the injection lines attach around the pump body. I will try to attach a pic.

ptfarmer · Sep 4, 2016

I'd have the whole pump re-sealed, most times what looks like leaking lines at the pump is the o-ring that seals the pump head needs replacing.

mf175s · Sep 4, 2016

There are some good posts on here about how to replace the orings around the throttle shaft and shut off shaft. I just did them on our 175. Can't stress enough to pay close attention to what holes the internal spring uses on both ends, and cleanliness of the pump and areas around it. On others advice I plan on re-sealing the entire pump also.

Dieseltech · Sep 4, 2016

Do what you like, but I agree with ptfarmer, patch jobs don't last. Of course I may be a bit biased after repairing pumps forty + years, it'll just spring another leak elsewhere soon. Most I see in for complete tear down, clean, reseal and test run about 300, including return shipping. Just finished a 180 pump that was leaking into the crankcase.

ptfarmer · Sep 4, 2016

When you look at it some of these injector pumps are going on 50+ years old, and are just now needing new seals, its pretty impressive. My honest opinion if you have good mechanical skills (rebuilding engines, transmissions, etc) resealing a injector pump is not too hard. Now if the tractor is running bad also because of the injector pump its best to take it to a shop that has the right equipment to rebuild, and test it.

Al Baker(pumpman) · Sep 5, 2016

A leaking throttle or shut off shaft is your messenger. It has come to let you know that all of the seals and gaskets of your pump are in need of attention. You can repair the cover assembly, but chances are really good that the drive shaft seals are getting tired also. If they fail you get diesel in your crankcase. Most times folks dont catch this fast enough and end up doing damage to the engine. A pump reseal costs money, but will save you head aches down the road. Most any good pump shop can get you up and repaired for under 400-450 bucks. If they charge more you are getting hosed. If they do them really cheap they have to be skipping something . Maybe quality. Good work takes time. Time does cost money. High price doesn't mean good, just like cheap doesn't mean good. Look around and find someone with a good track record that you feel comfortable with. If no one wants to treat you fair feel free to give me a call. I have resealed hundreds n hundreds of Cav pumps. Good luck Al 231/757/0064

dlinmi · Sep 5, 2016

Thanks all for the input, I'll be checking around local.

MF-165 Injection pump leak

dlinmi

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ptfarmer

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mf175s

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Dieseltech

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ptfarmer

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Al Baker(pumpman)

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dlinmi

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