Ford 6610 Lacking Power

[Sam6610]

I've 2 Ford 6610s, a mk1 from 1984 and a mk2 from 1986. The mk2 is seriously down on power and we can't work out why, it won't keep up with the mk1 at all and both are NA standard, we've done all of the usual checks and gone through the fuel system and fixed any issues with the lines dragging air. This hasn't made any difference so we decided to turn the fuel pump up (the minimec inline injector pump), this hasnt made any difference powerwise and the tractor struggles and labours just as much as before. Anybody got any ideas what to do next? The engine hasn't done a great deal of hours and runs sweet as a nut, its had new injector nozzles, new lift pump, new filters etc. Any help would be greatly appreciated, cheers.

 

[ford 7810]

Seen your post on FB, turned out to be a simple fix in the end !!! Has it as many horses as your other 66 now ?

They likely didn’t replace the lift pump when they overhauled the injector pump

 

[Sam6610]

Seen your post on FB, turned out to be a simple fix in the end !!! Has it as many horses as your other 66 now ?

no, not as powerful as my mk 1 6610. Driven quite a few different 6610s and non have been as close to it powerwise, goes as well as a 7610 and not been screwed, tuned or messed with.

 

[Sam6610]

They likely didn’t replace the lift pump when they overhauled the injector pump

third lift pump i've fitted now...