help with David Brown

georgedeep

hello all

got a 1490 DB that set in shed for 4 years not started but engine was all done up on it,
Was going fine before
I got diesel to the 2 filters and its smoking ok and opened the tiny nut on injector pump and getting some diesel there but none at the injectors.

When opening nuts one these do you open nuts at the injectors on these or open the top ones the one at the pump itself or does it matter.

blue5000

Welcome on board. I'm not a DB expert, but I'd usually open off pipe at injector last. Hope that makes sense. Is there anywhere to pump it by hand? Also check is the tap at bottom of tank open, it may have been turned off 4 years ago.

Avns1s

georgedeep wrote: »

hello all

got a 1490 DB that set in shed for 4 years not started but engine was all done up on it,
Was going fine before
I got diesel to the 2 filters and its smoking ok and opened the tiny nut on injector pump and getting some diesel there but none at the injectors.

When opening nuts one these do you open nuts at the injectors on these or open the top ones the one at the pump itself or does it matter.

Is there not 2 bleed nuts on the injector pump?

Timmaay

There is manual primer pump on the other side of the engine, in front of the starter, its part of the fuel bowl. Actually screw open the bowl 1stly and make sure the little filter in it is clean. Anyways open up the 2 bleed screws on the pump and then start priming until you got diesel coming through, keep going till most the bubbles gone, then open one of the injector pipes on the side of the engine to let out last of the air, it should fire up then.

georgedeep

thank you both, yes there is a bottom bled nut and also one nut directly above it, I got some fuel out of bottom one when opened but none out of top, I got fuel to filters and only thought you needed to open the bottom bled nut

1373

The glass bowl on the prime pump has a fine mesh filter . After 4 years of inactivity it is probably blocked. Tractor will not start if blocked. I’m only used to a 995 but I think they are similar

Avns1s

1373 wrote: »

The glass bowl on the prime pump has a fine mesh filter . After 4 years of inactivity it is probably blocked. Tractor will not start if blocked. I’m only used to a 995 but I think they are similar

And those lift pumps can give trouble too. Check that there is a good spurt from each of the bleed screws on the injector pump with each stroke of the lift pump (hand primer).

I Am The Law

blue5000 wrote: »

Welcome on board. I'm not a DB expert, but I'd usually open off pipe at injector last. Hope that makes sense. Is there anywhere to pump it by hand? Also check is the tap at bottom of tank open, it may have been turned off 4 years ago.

Always open at injectors, couple swings, you wont be far away.

RandomViewer

Used to be guilty of the diesel running back on them too,

Best bet is open the injector pipes at the top of the injectors, when you get diesel coming tighten all but one,should attempt to start ,then tighten final pipe,
if diesel doesn't come to pipes when you have flow at injector pump theres a possibility of sticking stopper tap pump on side which should clear sticking stopper

orm0nd

Timmaay wrote: »

There is manual primer pump on the other side of the engine, in front of the starter, its part of the fuel bowl. Actually screw open the bowl 1stly and make sure the little filter in it is clean. Anyways open up the 2 bleed screws on the pump and then start priming until you got diesel coming through, keep going till most the bubbles gone, then open one of the injector pipes on the side of the engine to let out last of the air, it should fire up then.

some very hard to get going, you are correct but might need to open each pipe at the inejctors individually and crank , if it still doesnt fire open no.1 again

White Clover

Might need a tow to get going. As 0rmond said, they're hard enough to start after bleeding them.

FintanMcluskey

Is the exhaust emitting any smoke to indicate if any diesel is actually getting delivered?

If smoke is being emitted but still no sign of life I would use a tin of ether.

Only spray a small amount of ether into the intake when the engine is turning over and listen for the change of sound

_Brian

At that stage I’d tow it before using easy start, that stuff easily destroys engines if used excessively

If our 996 is cold and air locked it can be a tough start but tow it and it will start in a few lengths of itself.

FintanMcluskey

_Brian wrote: »

At that stage I’d tow it before using easy start, that stuff easily destroys engines if used excessively

If it’s used correctly it won’t destroy an engine. It’s a 2 man operation to use easy start safely though.

Once the engine is cranking before it’s sprayed in small amounts it’s no problem.

Towing to start after an airlock, can be a messy task this time of year

Nekarsulm

Rack in the pump could be stuck in the closed position.
Tap the side of the pump with a 19mm spanner, then bleed again.
With all 4 pipes loosened at the injectors you should have spits of diesel coming as you spin the engine on the starter.
The close 3 pipes and see if it'll start.

patsy_mccabe

I've a DB 995 here and I'm an expert now on bleeding it. I've let it run out of diesel so many times.
They're a hard tractor to start at the best of times. In this cold weather, you have your work cut out. I've a feeling that there is water from condensation in the tank. Was the tank full all along.

I'd try the following;
..... fill tank fully with diesel and allow to settle.
..... check heater is working on inlet air manifold. Take wire off, loosing it and hold it against out side of manifold while someone else holds the key half way on. You should feel it heating up and a flame should pop after 5 secs or so.
... work the lift pump, thats the lever in under the glass bowl. Check glass bowl then for water. You should see it in it, without taking off. Clean bowl if water there and repeat again.

As for bleeding, there are 4 bleed nuts on mine. One on each fuel filter at top and 2 on the diesel pump. Lower one is lower pressure and top is high pressure. Start with filter nearest tank, then second filter, then lower and then upper nut on pump. You might need a second person to work the lift pump as you bleed. Again let plenty diesel out and look for water or air bubbles.
Careful opening all nuts, if you damage one pipe, you're in trouble.