lawnphysics

I am pretty sure I have a seal leak on a BOSCH Pump on my grandfathers 484. We are losing a good amount of diesel and I would like to get this fixed. I am posting pictures. Is this something I can fix myself. I am very mechanically inclined with hydraulic pumps/seals and gasoline engines. I just rarely work with diesel and this is the farm workhorse so I do not want to break it!


I can visibly watch diesel ooze out of the seal area the green arrow is pointing at inside the black box.

Is this a simple matter of ordering new seals and replacing, or will I have to have the pump/injector overhauled? I hope overhauling is not the case, because I can not afford to do that at this time. I would prefer to order the seal and replace it if this is something I can do!


Thanks!

Attached Images

     

cyrush

Theoretically it should go to a Bosch dealer for repair, but if you can get the bits you may be able to repair it yourself. ???

IH & Case sometimes showed a parts breakdown, but rarely carried these parts, usual supply source is the Bosch service network.

It is not usual to get a leak here, it could be because there is a restriction in the return line pressure. The pipe fitting on top of the pump is a banjo fitting , the banjo has avery small orifice, if this is blocked it could be the cause of the problem ??

The pump runs with quite ahigh pressure inside the casing because the speed of the pump is controlled by a hydraulic governor

cyrush

See att, Injection pump parts breakdown.

Attached Images

484 Bosch CR fuel inj pump - Parts Figure.pdf (180.8 KB, 59 views)

lawnphysics

I am pretty sure that the Part # 30 - Part #3078366R1 O-ring, Distributor Head. Is the Main issue. I am tempted to just keave it alone. I have been using the tractor more lately and it does not seem to be leakin as much. I also changed from off-road dyed diesel back to regular diesel. Seemed to help. Granted, it still leaks though.

SVanDee

Had the same problem with my IH 484 last year. Well, I'm not sure it was that exact seal but an injector seal was leaking fuel. The shop that overhauled it and several people that use heavy duty diesel equipment a lot told me the ultra-low sulphur fuel that appears to be all you can get now is to blame. Diesel engines that weren't designed for it relied on sulphur in the fuel for lubrication of seals and moving parts.

Adding a lubricant to your fuel might keep the problem(s) from getting worse. I've read and heard that you can just add some engine oil - even used since the fuel filter will take out any particles. I'm skeptical. I'd be inclined to use a product specifically intended for that purpose. My diesel supplier claims to have started adding a lubricant to his fuel about the time I got concerned so I haven't investigated products and don't have any specific suggestions for you. Maybe someone else will.

PSJ

I use this in my fuel. Because the engine runs smoother, sounds like it isn't laboring as much, I can mow about another 5 acres on a tank of fuel. I forgot to add it once and almost ran out of fuel in the field. It is also a pump and injector lubricant. PJ

Power Service Diesel Fuel Conditioner.



LINK== Diesel Fuel Supplement