how to change diesel filters

GERMAN ROCKS

Normally get the mechanic to change diesel filters in the tractors when they are with him but this tractor hasnt seen the mechanic with years touch wood. Anyway diesel filters are saying they werent changed since 2012 (I actually did them myself that year as I have it wrote on the filter). In anycase I remember having a job trying to start it again afterwards.

What the correct procedure when changing diesel filters in order to bled them afterwards. Take off filter, fill new filters with diesel and fit them and what are the next steps after that.

Engine oil gets changed every year in case ye think I neglect the stuff haha.

edit: tractor in question is a mf399 6 cylinder

_Brian

It seriously depends on the tractor.

Our David brown wouldnneed a blessing from the pope to start it again after opening the diesel system. The case international will bleed itself and start in a few turns.

buzzwell

Only thing I'll add is do it when the engine is hot and have new filter full of diesel and do as quick a changeover as possible! The longer the system is open the harder it gets to start in my experience.

barneygumble99

Loosen off an injector pipe nearest to the pump, turn over until it starts spitting diesel, tighten injector pipe, should start.

larthehar

Can.t say i know that model but i think it has a manual fuel pump.. open the bleed screw at the injector and pump til you see diesel! Otherwise you are waiting on the engine turning to pump the system!

Attie

http://www.ssbtractor.com/wwwboard/view_all.cgi?bd=massey&msg=687

Sam Kade

barneygumble99 wrote: »

Loosen off an injector pipe nearest to the pump, turn over until it starts spitting diesel, tighten injector pipe, should start.

I used to do that with Fords then I found an easier solution, press in the button on the stopper after getting diesel to the injector.

patsy_mccabe

Its actually very simple. This is how I do it on my David Brown 995.

- Run the tractor for a while so the engine is hot. Its much easier to turn the engine over then when you change the filters.
- Change the filters. Make sure the O-rings are in right.
- Now this is the important bit. The only air in the system now is in the filters, no where else. DONT go starting the engine.
- There should be 2 bleed nuts on the top of the diesel filter housing. Open the first one (on filter nearest the fuel tank). With this open, work the manual lift pump until the diesel comes out the bleed nut free from all air bubbles. Tighten nut.
- Do the same for the second nut, all the time working the lift pump by hand. Both filters should be now free of air.
- Now on the diesel fuel pump, there should be 2 small bleed bolts. the lower one is the low pressure side. The higher one is the high pressure side. As before open the lower one while working the manual lift pump until no air bubbles. Tighten then.
- Do the same for the high pressure screw. The system should be free from air.
- It should start now first go.

The biggest mistake people make is the they don't bleed it fully and drive air from the filters down into the diesel pump and air lock it. Don't be afraid to let plenty diesel out as you bleed each screw.

I've changed my diesel filters for years now and it is only in the last few years that I started doing it this way. Before that I would half bleed it and then spend a good hour trying to start it.

maidhc

patsy_mccabe wrote: »

Its actually very simple. This is how I do it on my David Brown 995.

Only thing I could add is you might need to open the union on No 1 injector if you are rightly stuck and crank for 10 mins. I always have to do this on my Ford 550, but never on the 4600 even though both have the same engine!