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Massey Harris & Massey Ferguson Tractors Discussion Forum

MF135 diesel fuel filter

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Johnny R.

04-02-2007 11:36:43

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I have changed the fuel filter on my 135diesel, and seemed to have lost the prime. Oviously i haven't got much experience with diesels. What is the best order to bleed in to get things going again. I seem to have fuel to the 2 injectors that i can easily reach. Should it at least try to start at this point or do i need to get to the third inj. in order to get it going.

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Vintage tractor engineer

04-05-2007 13:33:14

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Re: MF135 diesel fuel filter in reply to Johnny R., 04-02-2007 11:36:43

David's advice sounds spot on ,try again from the beginning.This sounds realy silly but is the stop control working the injector pump lever correctly?Ian

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Dean

04-03-2007 04:11:28

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Re: MF135 diesel fuel filter in reply to Johnny R., 04-02-2007 11:36:43

Johnny:

David P. is right on but I want to add one clafification.

A torch to those in the UK is what we Yanks call a flashlight. I'm sure that you know not to use what we in the US would call a torch to inspect your fuel tank.

That said, I changed both fuel filters on both of my MF-35s with Perkins diesel engines last winter. I removed and flushed the tanks, removed the fuel valves and cleaned the strainers and installed new fuel pumps.

After doing this I poured a couple gallons of fuel in the tanks opened the valves and waited until next weekend to prime the pumps. It took between 2000 and 3000 cycles of the primer lever to get bubble free fuel at the pump on each tractor.

Dean

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Johnny R

04-03-2007 05:14:13

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Re: MF135 diesel fuel filter in reply to Dean, 04-03-2007 04:11:28

Thanks, David and Dean. I tried last night, unsuccessfully. I seem to have air free fuel from both bleeder valves on the pump, but when opening the injector feed and turning the engine over, I still don"t have any significant flow or pressure there. Could there still be air in te system somewhere? I charged the battery overnight and will try again this evening.

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Dean

04-04-2007 03:43:48

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Re: MF135 diesel fuel filter in reply to Johnny R, 04-03-2007 05:14:13

Johnny:

Obviously you have air in the lines somewhere. If the lines are air free before the pump you must have gotten air into the pump and or high pressure lines. I suggest a complete bleed using recommended procedures.

It took several bleeding sessions to get all of the air from the high pressure lines on my 2, 35s after I removed them to replace the injectors.

Dean

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DavidP, South Wales

04-03-2007 04:24:45

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Re: MF135 diesel fuel filter in reply to Dean, 04-03-2007 04:11:28

Thanks for that.
DavidP

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DavidP, South Wales

04-02-2007 13:59:14

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Re: MF135 diesel fuel filter in reply to Johnny R., 04-02-2007 11:36:43

Hello Johnny,
Before going any further you should have two fuel filters on the tractor. If your tractor has a glass bowl on the lift pump there is a brass gauze here. Also there is a nylon strainer on top of the fuel tap. It is essential that these are cleaned. If there is no strainer fitted to the tap then it will have probably come off and be inside the tank. Set up a suitable funnel system and container and drain the tank. With the tank empty you stand a good chance of seeing the strainer with a torch and hooking it with a piece of wire. If you can't find the strainer it is advisable to buy a new one as the tap blocks very easily.
Refit the tap with some white PTFE tape and tighten so that the outlet faces across the tractor. Assuming that you have replaced the large and small O rings on both filters, you will find a central bleed screw on the rear filter. Slacken this off a turn or two. With freshly strained diesel and the tap on, pump the lift pump to fill both filters until clear fuel flows from the screw. Nip it up. On the main fuel pump you will see two 1/4unf screws going into what look like nuts. Slacken both 1/4unf screws and pump the lift pump. You should have a good jet of fuel from both but a solid flow of airless fuel is OK. Normally it is only necessary to slacken one injector but much will depend on the condition of the fuel injection system and compression. Heat will help in this case. Turn the engine over and you will see fuel coming from the loose injector nut/s. The pump will start to 'tick' and if everything is OK it will try to start. Tighten the injector nut/s and try again.
As above if you are 'nearly there' and in danger of running the battery down, a tow often works wonders because you have a slightly higher cranking speed. You should only need to do this once.
PLease let us know how you get on.
Cheers
DavidP, South Wales.
Ti

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