seal between injector pump and engine

I have an early 2.25 series three diesel, it has started to emit black smoke when under load and when accelerating. From searching this forum etc I have concluded that the likely cause is over fuelling. I therefore plan to have rotate the injector pump a little to find a compromise between smoke and diesel knock.

I went to rotate the pump only to notice that my there appear to be silicon (or alike) between the pump and the engine. I assume this is providing some type of seal. I'm a little reluctant to start twisting and rotating and disturbing the pump without first knowing the consequences of disrupting this silicon.

My question is therefore, should there a gasket or something between the injector pump and the engine? It looks to me as if someone has simply bodged this with silicon or alike.

Thks
Neil

Usually a thin paper/card gasket. Never found any need to jollop it up with anything.

cant understand the reason for silycon. i can only assume it either had an oil leak or it thought it might be a good idea to glue it in situ, there is no gasket as such, black smoke could be caused by faulty injectors, i would be tempted to dump some injection cleanig fluid in the fuel tank see if that helps.before going down the road of messing with the pump.

What are you thinking about?

How can changing the injection TIMING possibly affect "over fuelling" even supposing that's what your problem is?

The injection TIMING is probably the one part of your set-up LEAST in need of attention!

Take care with your random adjustments and remember that every degree you turn the pump is TWO degrees change in the timing.

Good Luck!

CharlesY

Thks for the words of warning Charles.

If you think rotating the pump may be a bad idea initially have you got any suggestions on what to try first. Getting the injectors tested possibly?
(I have already tried removing the air cleaner and driving in an attempt to establish if that was blocked.)

Chrs

neil

wesley_the_mad_biker said:

Thks for the words of warning Charles.

If you think rotating the pump may be a bad idea initially have you got any suggestions on what to try first. Getting the injectors tested possibly?
(I have already tried removing the air cleaner and driving in an attempt to establish if that was blocked.)

Chrs

neil

Click to expand...

Smoking BLACK is almost invariably excess fuel being injected. Too much fuel and not enough air makes black smoke.

Yes, I agree you should get the injectors tested and set to about 125 BAR opening pressure. 140 is too much, and anything under 120 is bad. They can be set very exactly, and it helps a lot if they are all the same. You need to find someone with a Hartridge PopTester - like mine!

Make sure no-one has been turning the screws on the injection pump. One of them is probably there to set the limit on maximum fuel delivery. If it has been opened up - PROBLEMS!!! If there is any suspicion of this, identify the max fuel screw and turn it in one full turn at a time and see if that helps. The screw involved will appear to be straight into the pump body, and will not be in contact with the throttle lever. It isn't a bleed screw either. It will probaly be SEALED with a lead seal and wire. This cuts down the options!

CharlesY