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Smokey Engine (TD)

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bigfatsi:
I've just bought a 90 2.5td and the previous owner fitted a supposedly brand new head recently. (The head is painted a kind of light green - is this an ex-military?) Anyway, it runs like the proverbial bag of spanners and smokes heavily as though overfuelling. Now I know the TD isn't the most silky smooth bit of kit ever devised, nor is it the most smoke free but it seems a little rougher than it should be. I'm hoping it's just a case of being badly set up, i.e timing etc as the smoke is black soot rather than blue oil. It's running slightly better now I've changed the black blob that was the previous air filter but it certainly feels as though something is out. Anyone know enough about TD's to give me some diagnostic pointers?

Cheers in advance,

Simon.

dreadnought110:
:) if it's black smoke it's usually overfueling i prsume the turbo's working?? if it's down on power it might be worth checking boost pressure? :?

bigfatsi:
I took off the turbo inlet pipe and it was spinning away but yes it is down on power. How do I check boost pressure? The little vacuum gadget on the side moves very slightly under full throttle. Is that an indication?

Simon.

Porny:

--- Quote from: "bigfatsi" ---I've just bought a 90 2.5td and the previous owner fitted a supposedly brand new head recently. (The head is painted a kind of light green - is this an ex-military?) Anyway, it runs like the proverbial bag of spanners and smokes heavily as though overfuelling. Now I know the TD isn't the most silky smooth bit of kit ever devised, nor is it the most smoke free but it seems a little rougher than it should be. I'm hoping it's just a case of being badly set up, i.e timing etc as the smoke is black soot rather than blue oil. It's running slightly better now I've changed the black blob that was the previous air filter but it certainly feels as though something is out. Anyone know enough about TD's to give me some diagnostic pointers?

Cheers in advance,

Simon.
--- End quote ---


Won't be ex-military as the military never used Td's (unless he's fitted a NA head - don't worry if he has) - light green will probably be a Land Rover recon.

As I've posted on another thread the diaphragm's in the fuel injection pump have a habit of splitting, which causes a very bad and smokey idle.

From the other thread:

--- Quote ---Harder to change than a later 200 or 300Tdi - is just a bit awkward, nothing complicated. They cost about £20/£25 from a diesel specialist.

The diaphragm controls the fuelling on and off boost - when boost pressure is created, obviously more air is being put into the engine - thus more fuel is needed.  When boost pressure is sense, the diaphragm gets pushed in supplying more fuel.  On Td's these have a habit of splitting - and back fill the pipe from the injector pump to the actuator. Meaning that the turbo gets filled with diesel – and allows the engine to run uncontrollably!
--- End quote ---


You can check this by removing the pipe that goes from the injector pump to the turbo - if it's full of diesel the diaphragm has split.  (do this with the engine off!!)

Is yours bad at idle or all the time??

I doubt the actuator moves very much as you will not produce turbo boost at idle (is impossible) and I doubt you checking at full load when moving!!

To check boost pressure you need to plumb a boost gauge in.


It is possible that the timing is out, most people don't use all the proper pins - esp. the one in the injector pump.  


Ian

bigfatsi:

--- Quote from: "Porny" ---
Is yours bad at idle or all the time??
--- End quote ---


It seems to idle OK. It's when you've got your foot down that it smokes like a chimney, especially when pulling away. It really does clatter too. Can't pull up small inclines in 5th.

How do I go about checking/resetting the timing?

Simon.

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