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Massey Harris & Massey Ferguson Tractors Discussion Forum
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Frequently needing to bleed 148 Diesel

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BG148

12-30-2005 15:44:07




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Hi,

I had a problem 3 months ago whereby my tractor (MF 148 AD3-152 diesel) when working under load (topping) would cut out after about 20 mins. I needed to bleed it before I could restart, work for another 15 / 20 mins before she would cut out again – very frustrating.
I replaced the fuel filters and the screen in the tank and my problem seemed to have gone away, however now the problem has just come back except this time the tractor cuts out after a much shorter period of time and I am not even working it hard.

The only thing that has changed recently is that I tightened the top bleed nut on the injector pump; it had a small drip since the previous problem.

This tractor gets used very little – an hour or two a week at most.

Anybody any ideas as to possible causes?

Cheers

bg

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DavidP,South Wales

12-31-2005 06:00:31




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 Re: Frequently needing to bleed 148 Diesel in reply to BG148, 12-30-2005 15:44:07  
Hi,
Cleaning the screen in the tank would have been fine at the time. It takes very little for the filter to block again especially if the fuel tank is half-full or so and allows to fuel with whatever debris might be inside to swirl around. Are you sure that the screen is still in place? It is a fiddly job to replace the tap if the tank is not empty and not too dificult to dislodge the screen. You also speak of little use. Have you checked the glass filter bowl for any signs of water? Condenstaion will build up very easily. It is always advisable to refill the fuel tank when you have finished work rather than the next time you start. Turn the tap off and undo the plastic pipe at the lift pump. Open the tap and you should have a good steady flow of fuel. Next remove the metal pipe from the lift pump and operate the lever. Stand clear! You should hear a sort of 'donkey' noise. This indicates that the pump is sucking and pumping at a reasonable level. UK 148's did not have a glass bowl on the lift pump but I don't know about yours. There is a gauze above the bowl if you have one. I think that your problem will be one of the above. It is unlikely to be air taken in at the bleed screw as there is too much low pressure inside the pump.
Come back if I can be of more help.
DavidP

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bg148

12-31-2005 12:00:58




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 Re: Frequently needing to bleed 148 Diesel in reply to DavidP,South Wales, 12-31-2005 06:00:31  
David,

Just to confirm. Your advice re disconnecting the lines from the lift pump, this is to establish that I am getting a good flow of diesel i.e. the screen in the tank is not blocked?

If due to condensation, I have water in the Diesel could this cause my symptoms? Would this not get trapped in the fuel filter bowl?

By the way I am just across the Irish sea and my 148 is UK built

Cheers

Brendan

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DavidP,South Wales

01-01-2006 03:49:24




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 Re: Frequently needing to bleed 148 Diesel in reply to bg148, 12-31-2005 12:00:58  
Hello Brendan,
That makes things a lot easier. Yes, the first thing is to establish that you have a good fuel flow. Yes, the water will get trapped in the glass bowl but once that is full it will not take a lot more to 'block' the filter and prevent fuel getting to the pump. I have a customer with 2 MF250's in Porthcawl. For some reason one is very prone to stopping (normally on the beach)due to water in the primary filter. They are both checked weekly. The water will not do any damage if present only short term. On the underside of the pump you will see another bleedscrew in a large hexagon head. Slacken this screw and pump some fuel through to see if there is any water present. (Do not use this one for normal bleeding).
Please let me know what you find
Happy New Year
DavidP

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bg148

02-11-2006 08:47:36




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 Re: Frequently needing to bleed 148 Diesel in reply to DavidP,South Wales, 01-01-2006 03:49:24  
David,

Eventually got back to try fix this problem.

Unscrewed the fuel tap and unfortunately left the mesh filter stuck in the tank!!. Barely a drip of diesel coming thru, which suggests blocked mesh is my problem. I failed to get the filter out and it eventually went up into the tank.

Any potential problem with leaving an old filter in the tank? I thought it might float but a test with the new one reveals no.

Cheers
bg

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phil25

12-30-2005 17:21:12




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 Re: Frequently needing to bleed 148 Diesel in reply to BG148, 12-30-2005 15:44:07  
Not familiar with the 148, but by bleeding, i assume you mean your cracking the fuel pump vent[ one you tightened] and /or the injector high pressure lines? If it then starts, you have a possible air line leak[ sucking air in with fuel] somewhere from tank fitting to the injector pump. This could be a fitting stripped/loose, got worse with new filter? maybe the filter seal is at fault, or a fititng at the pump itself, no areas wher a fuel line could have chafed a hole??
Does it run a set time and slows and choke/gag to a stop= fuel starvation/delivery problem.
If it runs a set time , be careful and attach a seperate and direct fuel supply to the injector pump supply connection and let it run for the same amount of time, off the temp fuel supply?
If it stops it isn't the supply side but delivery side of things, make sure its CLEAN fuel, as there is no filter during this test.
good luck

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Drill

01-01-2006 16:45:22




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 Re: Frequently needing to bleed 148 Diesel in reply to phil25, 12-30-2005 17:21:12  
If it is a high hour tractor I would check(change) the diphram in the lift pump. It may look good(no noticable holes) but can be worn so thin that it is sucking air right through the diaphram. I have a 1100 Massey that did the same for two years before I found the problem, put on a new lift pump and no more problems.



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