MF 1085 problems after overhaul

[Larry B 1486]

My uncle bought a 1085 diesel about two years ago. It never had the power i thought it should have. I think my old 175 I use to own would out pull it. This summer it spun two main bearings. Took the tractor to a repair shop, not a MF dealer. He had a reground crank and bearings, new oil pump and new sleeves and pistons. Really the works. After we got the tractor back it would loose prime in the fuel system and would not start. At times we could use the lift pump to build up pressure or would have to use eather. Many trips back to the shop replacing the lift pump, line to the tank and i think they said the line in the tank. Also had the injector pump rebuilt. There are no leaks. Been over that several times. Even replaced the lift pump the second time. After the rebuild it ran hotter, replaced the heat guage with a number guage and it runs about 220 all the time. Oil pressure 40 lb hot. Had the radiator boiled out at a radiator shop and changed the theromstat. It still don't have the power after the rebuild that it should. Anyone have any ideals whats going on with these problems?

 

[FERGIE PLACE]

180 degrees out of time maybe

 

[Jerry/MT]

Is the injectorr pump primed properly? Is the air filter clean?

 

[Roy in UK]

Actually the 175 was a heck of a tractor for it's size. We had an 1100 on demo pulling a 5 X 14 plow but I remember even the MF dealer was not too keen to have my dad working in the same field with with our 175 with a 4 X 14! The 1085 never appeared on the UK market but I do remember the 1080 was not a big success over here. ( Engine problems, reputation for being underpowered etc. )

 

[Larry B 1486]

Yes. New air filter,new fuel filters also.

 

[Thadd Ernstmeyer]

It could be plugged in the fuel tank. Clean the screen.

 

[Larry B 1486]

They were SUPPOSE to check that the fourth trip back to the shop. Said they replaced the suction line in the tank. Just lost on what to try next. I use to own a 165 and a 175 both diesel in the early 1980's, but never any trouble with thoes like this 1085. There are times it will start and five min later just die like you shut it off.

 

[jogl]

Here's what I would try next.

Get a container to use as a fuel tank (I use an old 4 gallon can) and fill it with fuel. Put the fuel can on the hood of the tractor and plumb it directly to the injection pump. I use rubber fuel line because I can just stretch it over most sizes of fuel lines. Also put a clear in line filter in the fuel line to catch any dirt and so that you can see fuel going to the IP.

You have now completely bypassed the entire fuel system of the tractor and should be able to isolate your problem to the IP or to the rest of the fuel system.

Note that you cannot run too long like this because the fuel return line will eventually fill up the on board fuel tank.

JP.

 

[Larry B 1486]

Thanks for that ideal, jogl. I will give that a try and that might tell me something

 

[[email protected]]

i have a 1085 that had the same problem of loosing prime-turned out the 2 lines on the front of the fuel fliter base were in the wrong hole.The last guy who had the engine apart got the two reversed-it CAN be done