Don't blame you not reading it!
That's interesting. What was blocking your pipe? I've got a new one on there, so it should be ok.
So, your blocked pipe was causing your oil pressure to go so high that the turbo seals couldn't hold it?
That's interesting. What was blocking your pipe? I've got a new one on there, so it should be ok.
So, your blocked pipe was causing your oil pressure to go so high that the turbo seals couldn't hold it?
julianf
Well-Known Member
Yep.
After buying another turbo, changing it, and still getting the issue, i admitted my diagnostic skills being at their limit (this was after the bottle thing and all that - and cleaning out the intercooler no end of times) and took it to the garage round the corner.
As they knew id done all the previous stuff, they did not take long to find the engine was pressurising, and they cleaned out that drain pipe, and it was all good.
I changed the cyclone and the oil directly after as a precaution. I guess it must have been bits of the cyclone blocking the pipe? But i dont know.
Do check the turbo oil drain pipe too though, as i understand that can do the same.
Im still driving round with the replacement turbo on now - 450 miles this weekend alone. I saw no point in swapping them again, so i have my original as a spare now!
After buying another turbo, changing it, and still getting the issue, i admitted my diagnostic skills being at their limit (this was after the bottle thing and all that - and cleaning out the intercooler no end of times) and took it to the garage round the corner.
As they knew id done all the previous stuff, they did not take long to find the engine was pressurising, and they cleaned out that drain pipe, and it was all good.
I changed the cyclone and the oil directly after as a precaution. I guess it must have been bits of the cyclone blocking the pipe? But i dont know.
Do check the turbo oil drain pipe too though, as i understand that can do the same.
Im still driving round with the replacement turbo on now - 450 miles this weekend alone. I saw no point in swapping them again, so i have my original as a spare now!
julianf
Well-Known Member
ps. why there wasnt oil shooting out the dipstick etc. i dont know
the garage said they took the filler cap off and that was when they realised the pressue, but i dont understand that either, but they said they unblocked that pipe at the bottom of the cyclone, and, whatever they did, it fixed it. This was last year somtime.
the garage said they took the filler cap off and that was when they realised the pressue, but i dont understand that either, but they said they unblocked that pipe at the bottom of the cyclone, and, whatever they did, it fixed it. This was last year somtime.
Seems strange. Was it not the pipe coming up from the crankcase to the top of the cylinder head?
julianf
Well-Known Member
That would make more sense.
I did query the diagnosis at the time, and the chap, in the nicest way, kind of shrugged his shoulders, and reiterated that the issue was fixed. Possible the wrong hose was communicated to me, possibly it wasn't, but, like the garage chap said, it was fixed, so it wasn't worth ME pressing the issue.
My advice to you, as a result, may or may not be inacurate, however, the concept is there, even it it might be a different breather! : )
I did query the diagnosis at the time, and the chap, in the nicest way, kind of shrugged his shoulders, and reiterated that the issue was fixed. Possible the wrong hose was communicated to me, possibly it wasn't, but, like the garage chap said, it was fixed, so it wasn't worth ME pressing the issue.
My advice to you, as a result, may or may not be inacurate, however, the concept is there, even it it might be a different breather! : )
Absolutely, I'll investigate all breathing pipes. Cheers.
julianf
Well-Known Member
He certainly said to me that he took off the filler cap, and there was pressure there, so that might be simple test.
Id think that taking out the dipstick would test for pressure in the lower half.
If both are at atmospheric (so no hiss from either) id assume, unfortunately, its something else.... : (
When i was doing no end of test drives to figure ours out, i never got to the bottom of exactly the driving style to trigger it. I guess any reaction would be delayed by the oil working its way through the intercooler anyhow.
It was a pretty hateful time. I drove the car to pick up the replacement turbo, keeping the revs right down, but waiting the whole way for a run-away condition.
Id think that taking out the dipstick would test for pressure in the lower half.
If both are at atmospheric (so no hiss from either) id assume, unfortunately, its something else.... : (
When i was doing no end of test drives to figure ours out, i never got to the bottom of exactly the driving style to trigger it. I guess any reaction would be delayed by the oil working its way through the intercooler anyhow.
It was a pretty hateful time. I drove the car to pick up the replacement turbo, keeping the revs right down, but waiting the whole way for a run-away condition.
I'll do some more tests this weekend. Focusing more on pressure than the passage of oil. If I take the return pipe off the bottom of the cyclone I can put a catch bottle under the cyclone unit. The top, open end of that pipe should release any pressure in the sump. I can then check oil leakage in to the turbo outlet pipe again.
In the meantime I've been in touch with the company I bought the turbo from. They've been very good throughout. The Mrs has some time off work in three weeks time, so they are going to pick the turbo up then and check it out. They said they didn't have one on the shelf to swap, but rather than me do any further work on the engine they would look at it to check it out. More convenient for us when the Mrs isn't at work as it's her daily drive, so that's in three weeks time.
Kwakerman
Well-Known Member
Must admit I cant see how a blocked cyclone (or pipe) can cause an increase in oil pressure to the turbo to the point that it will force oil out passed the seals. The turbo should be able to contain its oil at full oil pressure (55 PSIG), any higher pressure than that should cause the relief valve to open. Not saying that what JF said wasn't what he was told at the end of the day the fault was fixed but I would suspect the blocked breather pipe would have caused the engine to smoke because oily air was being ingested by the turbo rather than oil escaping out of the turbo body..
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Yes, I agree but I'm happy to try anything. I had a similar conversation with the turbo company who suggested a possible blocked return from the turbo. I was questioning how the turbo seals wouldn't be able to cope with the pressure. What I don't know is if overly high pressure in the turbo feed pipe would create pressure back to the relief valve enough for it to open.Must admit I cant see how a blocked cyclone (or pipe) can cause an increase in oil pressure to the turbo to the point that it will force oil out passed the seals. The turbo should be able to contain its oil at full oil pressure (55 PSIG), any higher pressure than that should cause the relief valve to open. Not saying that what JF said wasn't what he was told at the end of the day the fault was fixed but I would suspect the blocked breather pipe would have caused the engine to smoke because oily air was being ingested by the turbo rather than oil escaping out of the turbo body.
Kwakerman
Well-Known Member
I'd be surprised if the oil return pipe could be blocked unless it had been really twisted during installation and that should be easy to spot. It is a relatively large diameter pipe, is very short and just dumps its contents into the sump IIRC.
Kwakerman
Well-Known Member
You did remember to remove the blue roll before you fitted it?A perfect description.
This is me proving mine is not bent, kinked or blocked.
View attachment 126838
Ha, ha. That was just this weekend.You did remember to remove the blue roll before you fitted it?
Magicgrotto
Well-Known Member
You did remember to take the bung out of the turbo before you fitted it ?
Even though I had fitted the feed pipe, then the return pipe, turned the engine over (no fuel supply) several times with the return pipe in a milk carton to catch the oil, with oil flowing well. I have been back and checked that I hadn't left the bungs in!You did remember to take the bung out of the turbo before you fitted it ?
Mad, but I did check again. Worth a shout, cheers.
The thought of getting the compressor out has crossed my mind.
Just blew down the pipe instead.
Took the pipe off the bottom of the cyclone and blew down it. Could hear the air bubbling through the oil in the sump. Wasn't expecting that! No blockage though.
