Question on lines running to Turbo

Hello-
I am new the diesel's and turbos....Very GREEN... I have been reading up on the 19J engine. I am curious why someone would disconnect one of the lines to the turbo? From what I gather, it could be a bad turbo unit or other problems within the engine itself.
How would one diagnose the problem? I have attached a photo to visualize what I currently am looking at. The line that I speak of is the small line that come across from the far side of the engine and connects to the top left of the turbo unit. I would have shared the actual photo but I do not know how to load that on this forum.


Currently, the engine runs quite well, with no issues thus far. Truck came from a farmer, registered as farm vehicle and not allowed on public roads. If you believe the odometer... truck only has 60k on it. Engine does leak oil, not too aggressive but little more then to be expected. Need to get pressure washer out to clean it up to find the source. Any how, enough rambling...

Can someone offer a link, a site to educate myself, thoughts, comments or concerns??

turbo has a pipe that runs from turbo to injection pump ,so that boost can effect the pump diaphragm and increase fueling, a branch will also go to the waste gate diaphragm so that it opens when set max boost is achieved

Ahh, I have so much to learn... I feel like I just read Chinese.
Thank you James.

scottri said:

Ahh, I have so much to learn... I feel like I just read Chinese.
Thank you James.

Click to expand...

oddly id written in korean style
have you a pipe that runs from injection pump to turbo

yes. its capped off right at the turbo.

scottri said:

yes. its capped off right at the turbo.

Click to expand...

Could mean that you're boost diagram is split which would mean that fuel could be going up that pipe which is the boost pipe. I found that once I had it properly reconnected the engine gave a lot more boost. I checked whether diesel was leaking by connecting the line to a plastic bottle.

The picture was from a short trip around town. I suspect that diesel might be leaking through the diaphragm .
This link is very clear in how to find it and replace it. http://forums.lr4x4.com/index.php?showtopic=33911

Thanks Henry. I will give it a look.

The boost diaphragm are quite cheap, I think I paid £16 for a Delphi one. a bit fiddly to fit but made a massive difference, made the motor run a lot hotter though as the cooling system was bunged up. possibly could have been capped off to lower the combustion temps and prevent heat stress rather than trying to boost power. How far has it travelled? what year is it?

I'd recommend giving the engine a damn good service before you do much else. You never know what's borderline until you cross it! So the coolant should be flushed and changed (and the thermostat to be on the safe side.) For a farm truck it's not unlikely that it was bodged at some point to keep it trundling along.

That pipe increases fuelling in response to increased turbo pressure- with it disconnected the engine will be slow. The boost diaphragm is a delphi part and is a cheap and relatively simple part to replace. Just watch out for the little bolts when you take it apart, and set the pin in the new diaphragm to the same as the old.