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a hole in one of the pistons
the diaphram in the fuel lift pump goes bad and leaks fuel into the engine
There are many reasons why a Massey Ferguson 50 won't drive, including a lack of fuel, or a battery problem.
Reseal or replace the valve.
Loosen the bolt on the top of the injector for cylinder #1, located on the left side front of the engine, under the fuel tank. Prime the system with the manual pump located on the right side of the tractor to the rear of the fuel filter and above the starter. Prime until clear fuel without air spills from the injector. Repeat for injectors 2 and 3. If you have someone to crank the engine, you can close and open each injector repeatedly. Close the injector, build pressure, then release. It takes a while, stay with it.
Some pos problems include leaking fuel injectors leaks ,fuel pump leaking main injector pump and crack cly sleave
There are two cylinders on the left side of the tractor, these are the filters. First turn off the fuel by turning the fuel tap at the back of the fuel tank. Now on my tractor the two filters are the same, both have a metal bases and not glass but it is nearly the same thing. Over the filter, there is a securing seen on the top, turn this anti-clockwise to lossen. Remove the base, you should see a rubber ring on the bottom of the old filter and on top (if you can't see it, it's probaly stuck inside the filter head) and a smaller ring under filter head. Change the rings and place the new filter on, i.e base,ring , filter, ring and tighten the bolt to the base. Remember to switch on fuel .
it's under the black mesh screen between your feet as your sitting on the machine. you have to remove the gray plastic from the dash to the floor 6 screws per side
How to get the air out of the fuel lines on a 3910 diesel tractor
the 255 i just repaired had a push rod adjuster loosen up causing the valve not to open The valve was not opening so no air movement you can loosen the primary fuel lines at pump to see which cly may have a problem
Tractor as classed as industrial machines and these use diesel fuel rather than petrol (gas)
You may want to check with a third party source to see, depending on what parts you need. I'm thinking someplace like NAPA or other Auto Parts catalogs might show some of the same for each and quite often they would list them together. Or, if you know the Perkins model you could get a manual for that engine. It's probably the same, although Perkins may have changed something for Massey Ferguson. As an example, they may have changed motor mounts, or fuel lines, air intakes, or similar so they would adapt to MF's tractor easier. You should be able to find a Perkins manual on Ebay or a similar web site.