Hi there, I knew to this forum, and wondering if anybody could help me. I have a Drott B100 bulldozer and having a few starting issues concerning the fuel system, now the last time I used the dozer it just ran out of fuel (I use red diesel) and guessing it dragged all the crap out the bottom of the 40 year old + fuel tank. Now, I have a little knowledge about engines and how they work etc, so I set about draining the tank, cleaning all the lines etc. These are all clean and have free flowing fuel to the pump and out through the filters. when the fuel re-enters the pump nothing happens after this. nothing goes from the pump to the injectors. I have turned the pump over and it works. I suspect there is a gauze(fine metal mesh) that could be blocked or something similar I have started the dozer using 'easy start' and it pumps fuel at the first stage but not after it re enters the pump. sorry if im abit confusing but im trying to explain the best I can. any help would be greatful in diagnosing my problem. Tom
Did you bleed the air out of the injection pump? There should be "bleeder" screws on the top (and sides) of the pump. And is "easy start" a spray can of starting fluid/ether? Typically the fuel inlet is off of the bottom so it doesn't suck the last sludge out when it runs low. Plus the filters will do their job and plug before you cause trouble with the pump. Once you get fuel coming out of the bleeder screws, then crack (loosen) an injector line to help it bleed the air when cranking.
i didn't bleed the system as such, after cleaning (i didn't take off the pump only cleaned the lines) i primed the system manually used the pump until it went hard. and yes 'easy start' is like a starting fluid. im really confused because unless the pump is not gaining pressure to pump diesel through. im unsure. Personally i think i need to take the pump off and clean and replace all the gaskets etc. or buy a reconditioned one. When the machine was first bought by myself it had just had a service and all thefilters had been changed, and that was around two years ago. but its probably only ran around 24 hours in total if that. when i try and start my dozer it runs on the easy start and every now and then puffs black smoke as if diesel is coming through, but it is only brief. thanks for the help and any more would be appricaited. Cheers Tom. PS. i think its a simms fuel pump (that's what it has on the side anyway)
Bleed the system, upto and including at the injectors
The injection pump can't build pressure if it's pumping air, and it WON'T pump the air out on it's own in any reasonable time frame. You need to figure out where the bleeders are and pump it until fuel comes out. If you can't figure out where the bleeders are, post a pic of the injection pump and we'll tell you which bolts to loosen. And you do know starting fluid can be bad for engines, right?
i will try bleeding the system next time im at the farm, and il also take a picture just for referance. i knew that your not ment to use loads of the stuff yeah, but how bad? Tom
If you don't hear knocking, I figure it's not doing any harm, but it's awfully easy to get that deep knocking sound that can't be good. And never use ether/starting fluid with glowplugs or grid heaters.
Take a picture of the fuel system and we'll walk you thru it. Cant find it on the web.
There will be two 7/16" headed bleed screws on the side of the pump. You wil need to bleed both of them, one at a time, until the fuel coming out is free of bubbles. Then crack the hp pipes at the pump end, then at the injector end. These engines aren't hard to bleed. If it's a pig to start, check the glow plugs are working. On it's best day a 100 needed a good 30 seconds of pre-heat. You shouldn't need the easy start if the glow plugs and excess fuel button are working.