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Nick20

Member

• Jun 20, 2018

• #1

After hearing about many who have had success upgrading their boost pin for their defender, i thought i would do the same for my 1990 200tdi Defender.
Managed to get the 4 screws holding the diaphragm cap off and black oil started running down to the floor. Let it drain (few tablespoons worth) and cleaned up the inside as there was plenty on top where the rubber seal and 10mm nut is.
I couldnt even lift out the diaphragm to replace the old pin however much i pushed, pulled and wiggled so just put the cap back on as before but now im worried that something is not right and i dont know where to start. Car does seem to drive fine though, pulls fine and i dont see any visible black smoke even on full throttle.

How worried should i be and any recommendations on where my first line of investigation should be?

Many Thanks

 

Maroondestroyer

Active Member

• Jun 20, 2018

• #2

If you marked the diaphragm from its original position, try putting full throttle then spin the diaphragm as you lift it, it may push the pin all the way back. Sounds like the pin is stuck out a fraction.

This is based on the fact it is the same setup as my 300tdi pump.

 

Maroondestroyer

Active Member

• Jun 20, 2018

• #3

But the turbo must be passing oil for it to be sitting on the diaphragm as it’ll be blown up the boost pipe to the diaphragm.

 

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Nick20

Member

• Jun 20, 2018

• #4

Maroondestroyer said:

If you marked the diaphragm from its original position, try putting full throttle then spin the diaphragm as you lift it, it may push the pin all the way back. Sounds like the pin is stuck out a fraction.

This is based on the fact it is the same setup as my 300tdi pump.

Click to expand...

Marking its position would have been smart... so of course i didnt
But will try full throttle and see if i can get it out

 

Maroondestroyer

Active Member

• Jun 20, 2018

• #5

You will be able to re-align it once it’s out, as you’ll see where the pin has been rubbing on it

 

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Nick20

Member

• Jun 20, 2018

• #6

Maroondestroyer said:

But the turbo must be passing oil for it to be sitting on the diaphragm as it’ll be blown up the boost pipe to the diaphragm.

Click to expand...

I thought this too but i dont really know where i go from here. Is it severe enough to need a new turbo or something as simple as new seals/pipes?

 

Maroondestroyer

Active Member

• Jun 20, 2018

• #7

Not sure on the turbo. My understanding is that you could buy a new cartridge and fit it yourself, send off for rebuild or buy new.

 

adrian hogg

Well-Known Member

• Jun 20, 2018

• #8

may not be turbo it is possible a little blow by off the engine breather especially if oil has ever been overfilled, Just run the engine at idle with the breather pipe disconnected to see how much is blowing by the pistons, you will doubtless see some gas/oil mist being discharged but if it is blowing like an old steam train maybe time for rebore

 

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Nick20

Member

• Jun 20, 2018

• #9

adrian hogg said:

may not be turbo it is possible a little blow by off the engine breather especially if oil has ever been overfilled, Just run the engine at idle with the breather pipe disconnected to see how much is blowing by the pistons, you will doubtless see some gas/oil mist being discharged but if it is blowing like an old steam train maybe time for rebore

Click to expand...

thanks! will try this tomorrow.
Was actually looking at ordering the Allisport aluminium engine breather catch tank for a while now, think ill go for now