black smoke on load

since sorting the lump in my 300 tdi,it came with a different injection pump in better condition than mine,but tickover sounds higher,it chucks out black smoke when you put your foot down,does this sound like the pumps been tweaked?can i put it back as i dont think it will pass a mot

THEengineer said:

since sorting the lump in my 300 tdi,it came with a different injection pump in better condition than mine,but tickover sounds higher,it chucks out black smoke when you put your foot down,does this sound like the pumps been tweaked?can i put it back as i dont think it will pass a mot

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High tickover is a good sign, on a very worn pump the idle will generally drop.

Wouldn't worry about black smoke, pretty normal on older diesels under load. And more likely to be pump timing than fuel pump adjustment.

Look and see if the seals/paint on the pump screws have been broken. They will if it has been tampered with

I would only try and alter the screws if it actually fails the emissions test, leave well alone otherwise.

Easiest way to check if it turns out it has been tuned is to pull the diaphragm and check to see if you have two score marks on the slide.

If you search my threads I did one on de-tweaking a pump

Turboman said:

High tickover is a good sign, on a very worn pump the idle will generally drop.

Wouldn't worry about black smoke, pretty normal on older diesels under load. And more likely to be pump timing than fuel pump adjustment.

Look and see if the seals/paint on the pump screws have been broken. They will if it has been tampered with

I would only try and alter the screws if it actually fails the emissions test, leave well alone otherwise.

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pump does look like its been messed with centre cap looks twisted,quite a lot of black smoke on accelaration,old pump never did this,though lots more grunt,new belt fitted and timing good

is the smoke screw under the cap?

blue beasty said:

Easiest way to check if it turns out it has been tuned is to pull the diaphragm and check to see if you have two score marks on the slide.

If you search my threads I did one on de-tweaking a pump

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cheers BB

If you wind the max fuel screw in to far not only does it cause black smoke it raises the idle.
Its the 6mm headed screw/bolt on the back of the pump.

yeah that's been modded. as above check for orig score marks and if the guy who did it wasn't a muppet, he will have marked the orig position on all the bits. either a mark or punch

just read beasty thread,his is a non turbo,mines a turbo,are talking the screw in the centre of the diaphragm needs backing off?

THEengineer said:

just read beasty thread,his is a non turbo,mines a turbo,are talking the screw in the centre of the diaphragm needs backing off?

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There's 3 common adjustments, the smoke screw under the cap, the star wheel under the slide and turning the diaphragm/slide.

Iirc the most common amount of adjustment is listed in my thread (I know it's non turbo but came from a 200tdi) but only the centre smoke screw will effect tick over.

blue beasty said:

There's 3 common adjustments, the smoke screw under the cap, the star wheel under the slide and turning the diaphragm/slide.

Iirc the most common amount of adjustment is listed in my thread (I know it's non turbo but came from a 200tdi) but only the centre smoke screw will effect tick over.

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Cheers BB,will look at your thread again,this it? http://www.landyzone.co.uk/lz/f16/injector-pump-de-tweaking-199316-2.html

THEengineer said:

Cheers BB,will look at your thread again,this it? http://www.landyzone.co.uk/lz/f16/injector-pump-de-tweaking-199316-2.html

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Yep, this is the guide that most folk follow http://www.landroverweb.com/Pdf-files/Tuning_Land_Rover_Tdi_engines_Rev_2.pdf

Basically the fuelling is controlled by the smoke screw when there is no boost from the turbo then as the turbo spools up the diaphragm is pushed down to a maximum set by the star wheel. The cone under the diaphragm is offset so turning it up to a maximum of 180 degrees also increases fuelling under boost.

Heavy smoke with foot down hard could be a combination of all three.

Diaphragm can usually be returned to standard because the original score mark remains visible but for the star wheel and smoke screw it's guesswork.

The max fuel screw on the back raised my idle and smoke levels alot more compared to the other three adjustments, has a locking collar on normally if it hasnt been messed with.
Could always turn the turbo up more or get some "no smoke no poke" stickers

nice one Brian,will sort this at the weekend

jack21 said:

The max fuel screw on the back raised my idle and smoke levels alot more compared to the other three adjustments, has a locking collar on normally if it hasnt been messed with.
Could always turn the turbo up more or get some "no smoke no poke" stickers

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having just lost a engine,more concerned at killing another TBH

THEengineer said:

since sorting the lump in my 300 tdi,it came with a different injection pump in better condition than mine,but tickover sounds higher,it chucks out black smoke when you put your foot down,does this sound like the pumps been tweaked?can i put it back as i dont think it will pass a mot

Click to expand...

A bit of smoke is no bad thing....

right bit of a update,right bastid to get the four screws out,had to remove the expansion tank,screws where mega tight,found the diapragm had been tipexed,so put it back,did not alter the cogged screw as i found the ring in the picture missingis this normal?,this pic is of a disco pump,mines a manual,is there a difference ? about to test it see if it smokes

now smoking much less,still a bit but not as bad,though bit concerned by the missing bit,idle tick over is still high