The fuel flows through the holes to get from the injector into the return tube.Does anyone know the function of the two port holes in the top washers that go between the injectors and the overflow tube in a D902 engine?
The sealing washers have to have holes in them for the fuel to flow freely. If they did not need the holes, they would not put them in the correct washers.I thought so
Local kubota dealers’ tech told me regular cooper crush washers we’re fine, but it wouldn’t fire, and I can see constant air bubbles in the return line going from injector pump to overflow tube, even after bleeding the entire system.
Could these two things be related?
Did you manage to sort this problem? I have a similar issue with lots of air bubbles coming from the injector pump overflow line.Should I assume since I’ve been trying to start it with no luck, that the wrong washers kept the overflow from entering the tube and have been dumping excess fuel into cylinder?
Thanks for the update. I think I'll focus my attentions on the injectors as everything else checks out ok.Yes it’s all sorted and the washers were one of the culprits
i got correct ones, a set of reman injectors, new overflow tube, all new fuel lines, and still ended up rebuilding the engine again because a retaining ring fell out of the wrist pin seat and scored the cylinder
as far as the bubbles go, it was a symphony of problems and solutions as far as I can tell. I wish I actually knew what main source of bubbles was though