F

Faber

Member
Some time ago it wouldn't start. I attached an injector to the distributor pump out of the engine as per workshop manual and it wouldn't spray.

Fast forward to a gravity feed on a bench with a drill rotating the pump....the injectors all sprayed.

To see whether this would work on of the same basis but with the pump in situ I set it up to find the injector did not spray as before.

My conclusion....either the battery kaput or poor connections.

Connections good and drop voltage on cranking 10.04.

So battery seems to be OK, so why does it work on the bench but not in situ....no compression factor on bench...problem with starter motor?

So the battery, injectors and pump seem to be OK but on the bench it works and in situ it doesn't, but I don't understand why!

I am tempted to remove the glow plugs to ease compression and see if the dist pump spins faster activating the injector attached to the pump but out of the engine.

Clutching at straws!

Have I missed something obvious?

My next steps would be to see if the engine fired with the gravity feed plus rubber primer pump, then via the normal lift pump feed.

Fuel pressure and engine compression are good and if I ever get round to it again I know how to set up the timing.

Any observations, including the obvious would be most welcome.

There appears to be no airlock.

Thanks

Faber
 
Faber said:
Some time ago it wouldn't start. I attached an injector to the distributor pump out of the engine as per workshop manual and it wouldn't spray.

Fast forward to a gravity feed on a bench with a drill rotating the pump....the injectors all sprayed.

To see whether this would work on of the same basis but with the pump in situ I set it up to find the injector did not spray as before.

My conclusion....either the battery kaput or poor connections.

Connections good and drop voltage on cranking 10.04.

So battery seems to be OK, so why does it work on the bench but not in situ....no compression factor on bench...problem with starter motor?

So the battery, injectors and pump seem to be OK but on the bench it works and in situ it doesn't, but I don't understand why!

I am tempted to remove the glow plugs to ease compression and see if the dist pump spins faster activating the injector attached to the pump but out of the engine.

Clutching at straws!

Have I missed something obvious?

My next steps would be to see if the engine fired with the gravity feed plus rubber primer pump, then via the normal lift pump feed.

Fuel pressure and engine compression are good and if I ever get round to it again I know how to set up the timing.

Any observations, including the obvious would be most welcome.

There appears to be no airlock.

Thanks

Faber
Click to expand...
Lift pump, filters, including the little gauze one in the injection pump, sediment bowls if any, leaks on fuel lines.

And a dead battery won't spin a vehicle over very fast, however much you charge it, so try another.
 
Still sounds like air in the line.
If the engine turns it should squirt.
Does it fire with easystart. Always a goto for me just to eliminate other issues.
 
If the engine seems to be turning over reasonably quickly and there is fuel in the tank, it must be a lack of fuel to the pump. Maybe a duff low pressure pump or blocked filter/fuel line. Try it with the fuel tank filler cap removed. If its been stood unused for some time, the low pressure pump may need priming.

Col
 
Thanks for that.

As I said, what I can't understand is that the injectors and pump work when on a bench driven by a drill attachment with gravity feed, but not when the pump is driven by the quill shaft in the engine again by gravity feed.

I use a rubber primer for both, to expel any air that's there.

Fuel pressure from the lift pump is 7 psi which seems to be OK if I ever get the engine going again!
 
Old Series diesels can be slow to get going even when every thing is correct if they have been stood long time.
Good battery and easy start or tow start it.
 
tottot said:
Old Series diesels can be slow to get going even when every thing is correct if they have been stood long time.
Good battery and easy start or tow start it.
Click to expand...
This^^

My engine is in good condition having been lightly rebuilt about 8 years ago and still needs a healthy amount of glow plug and more revolutions than I would like to actually get going. once it has been running it will restart with half a trun but form cold they are not easy.
 
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