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Old 29th November 2019, 21:38   #21
T-Cut
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Originally Posted by KeirL View Post
Thanks again for your input and happy to follow any further advice or thoughts that you (or anyone else) may have.

I did say I know little about diesels, but there are obviously many around here that do. It's a pity you didn't wait longer before wasting your time. Good luck with the job.



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Old 29th November 2019, 21:55   #22
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Thanks - I don't consider I've wasted time really - I've found a hole in the intercooler so this needs replacing anyway, and I'll up-rate the seals to Viton whilst I'm doing this. And it only took about 30mins to remove the turbo - but this now allows me to check the bearings as you suggested so a bit of piece of mind that they're either ok or may have failed.

Brian did say he had seen one failed turbo - perhaps mine will be the second
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Old 29th November 2019, 22:43   #23
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Thanks Brian
That sounds very encouraging - I'd love for my turbo to be fine.
So I pulled a few things from the car today as it was a nice day and I wasn't working - The PCV filter looked in a bad way and afaik has probably not been changed before (not 100% sure). There was a lot of oily tar stuff in the EGR and inlet manifold - which I assume means that oil must be getting past the turbo oil seals??? is that correct?
However, I have often checked and cleaned the EGR and it's always this way - it didn't seem much worse today than the last time I checked it.
When you say "a blocked crankcase breather forcing oil into the intake system will" is that by forcing the oil past the turbo oil seals or is it some other route into the intake system. If it's by pushing past the oil seals, then won't this damage\weaken the seals in the turbo or can they still perform normally once the crankcase breathing issue has been resolved?

I removed the intercooler today which I then found had a hole in it (at the opposite end to the elbow pipe) and oil was leaking from this - so the intercooler definitely needs replacing and I will fit Viton seals whilst doing this, but there was also a lot of oil at the back of the engine - around the turbo itself - is this also expected when the breather is blocked?
I also removed the turbo today - actually only about 30mins work - as I had already done most of the pre-requisite work in taking out the PCV etc. So there's no hardship in checking the bearings as T-Cut has suggested, cleaning up all the oil around the back of the block and re-installing it for testing once I've got a replacement intercooler.

I don't recall hearing a hiss when opening the oil cap - but then I wasn't listening for one and not yet in a position to test for that now.

Thanks again for your input and happy to follow any further advice or thoughts that you (or anyone else) may have

Keir
If it's any consolation, the turbo will be fine, and the blocked PCV filter will have caused the oiliness around the back of the engine.

At least you know how it comes apart

My first diesel 75 was bought with a blocked filter, and the owner had been told it was a knackered bottom end

I felt so sorry for the car (which was obviously recently been used as a taxi) and was very very neglected, I didn't offer advice on what it could possibly be.


So after driving home slowly, I removed the PCV and found it to be absolutely solid as a brick

New filter, new oil and filter, new lower arms and bushes, four new dampers and springs, four tyres and one swivel hub later, I gave the car to my dad (I wasn't keen on the colour..........disappointing grey )

That was at 80,000 miles, the current owner who is a member on here, commutes some 70 miles a day, and the car is still spot on, and still has the original turbo fitted, I'm sure by now it has about 170,000 miles on the clock
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Old 30th November 2019, 00:48   #24
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I have seen a few blocked PCV filters

1

2

3

Once they are blocked solid you are in for some trouble know doubt about that.
4

5
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Old 30th November 2019, 07:38   #25
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Great - thanks
So the filter can be changed - and I have one of those already - but is it the 'valve' that can also be blocked? Is the valve iteself the item to the right of the filter (as in photo #2)? Do I need to do anything with that - perhaps just open that part of the housing and clean?

many thanks
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Old 30th November 2019, 09:34   #26
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Great - thanks
So the filter can be changed - and I have one of those already - but is it the 'valve' that can also be blocked? Is the valve iteself the item to the right of the filter (as in photo #2)? Do I need to do anything with that - perhaps just open that part of the housing and clean?

many thanks
Hi Keir.
I have not seen a valve blocked as of yet, but I suppose it could happen, usually you just need to wipe it out clean with a rag, but if you did need a new one then here you go.

https://www.ebay.co.uk/itm/BMW-E46-E...MAAOSwOzldnKcp
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Old 30th November 2019, 09:59   #27
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Thanks Arctic
I've taken a look at the actual valve and I think I'm ok. The diaphragm's not split or anything and seems to move up and down easily.
I do have a question about my turbo but I'm going to start a new thread for that as this one's getting a little long.

cheers Keir
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Old 1st December 2019, 09:06   #28
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The valve is a depression limiter - the diaphragm is vented to atmospheric ambient pressure and it closes to prevent the turbo from creating a negative pressure in the crankcase.

As long as the diaphragm and spring are in good condition it moves freely you should be fine.
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Old 1st December 2019, 09:57   #29
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Local garage advised me a about the breather PCV filter blocking. Told me they had a local owner of a BMW come in , burning oil like a smoke screen in WW2 movies. . BMW specialist had advised it needed a new engine. He changed the filter, which was virtually solid & after all the oil had burnt off, perfectly alright .
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Old 1st December 2019, 17:52   #30
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Don't forget though. Tell us If that blocked filter change fixed it then it will give me a nudge to go and check mine Before I start any oil ------drinking.
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