pos
Well-Known Member
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- 3,685
- Location
- West Yorkshire
Hello,
I'm slowly making progress with my underpowered 200TDi. So far I have found a gaping hole in the fuel filler pipe, so my tank had been full of water and salt thrown up by my wheels (tank drained). I've replaced a dogey joint in the fuel line, swapped my lift pump (which had a failed diaphragm) cleaned my injectors and replaced my fuel filter. The bastard thing is still underpowered though. I'm narrowing the problem down to the fuel pump now however. When the turbo starts boosting, the pump isn't giving the engine any extra fuel. The union on the compressor housing that provides air to the waste gate actuator and the boost diaphragm pipe is clear and producing plenty of "puff". When I removed the top off my injection pump (boost diaphragm housing) I've found that there doesn't feel to be much air coming down the pipe when the turbo is boosting. The pipe is not split, or blocked however.
The boost diaphragm is in good shape with no splits or tears and I can push down on it to adjust the load on the spring without there being any stiffness etc (besides the tension in the spring of course). How do I remove the boost diaphragm and the eccentric pin from my 200TDi injection pump? Supposedly if you push down and jiggle it and then lift up it should pop out, but this is not the case. I have a feeling that the diaphragm is positioned in the wrong place or that the pin has seized with water being passed through the fuel lines. How would I free the pin up if it has seized and how would I know? Also, how much pressure (boost) should there be coming down the boost diaphragm pipe under load?
Is there anything obvious that I can check in the injection pump with regards to increasing the fueling as the boost increases?
Thanks for any help, this is a frustrating and ongoing problem!
-Pos
I'm slowly making progress with my underpowered 200TDi. So far I have found a gaping hole in the fuel filler pipe, so my tank had been full of water and salt thrown up by my wheels (tank drained). I've replaced a dogey joint in the fuel line, swapped my lift pump (which had a failed diaphragm) cleaned my injectors and replaced my fuel filter. The bastard thing is still underpowered though. I'm narrowing the problem down to the fuel pump now however. When the turbo starts boosting, the pump isn't giving the engine any extra fuel. The union on the compressor housing that provides air to the waste gate actuator and the boost diaphragm pipe is clear and producing plenty of "puff". When I removed the top off my injection pump (boost diaphragm housing) I've found that there doesn't feel to be much air coming down the pipe when the turbo is boosting. The pipe is not split, or blocked however.
The boost diaphragm is in good shape with no splits or tears and I can push down on it to adjust the load on the spring without there being any stiffness etc (besides the tension in the spring of course). How do I remove the boost diaphragm and the eccentric pin from my 200TDi injection pump? Supposedly if you push down and jiggle it and then lift up it should pop out, but this is not the case. I have a feeling that the diaphragm is positioned in the wrong place or that the pin has seized with water being passed through the fuel lines. How would I free the pin up if it has seized and how would I know? Also, how much pressure (boost) should there be coming down the boost diaphragm pipe under load?
Is there anything obvious that I can check in the injection pump with regards to increasing the fueling as the boost increases?
Thanks for any help, this is a frustrating and ongoing problem!
-Pos
There's nothing there to demonstrate it being a cracked block mind. There's no loss of coolant and no crankcase pressure. I'm certain that this is related to the pin and the diaphragm eccentric inside the injection pump. If there's been the slightest bit of water in there, the pin that slides up and down the eccentric under the diaphragm may well have seized.
