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  #11  
Old 05-17-2016, 01:09 AM
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Think I have answered most of the questions, but I will be glad to elaborate if anyone needs more info. So to recap, if you have this issue, this is what I would do.

1) buy two new diaphragms with caps. You will break the caps getting them off.

2) remove the old ones and discard. A torn diaphragm will cause this problem too.

3 clean out all the gunk with carb cleaner. Try not to let it run down into the engine. It's not the end of the world though as its volatile and will evaporate out quickly while driving.

4)Make sure that the drain passage is draining. You can pour a little oil into it and see if it goes down. A pipe cleaner might be helpful.

5) clean out the hose that goes to the intake manifold. The fitting is a handy squeeze clip thing.

6) Reassemble. There is a vacuum nipple on the cap that goes no where. It was confusing to me.

7) I emphatically do NOT recommend ever using any stop leak or oil additive products in a tight tolerance engine like this one. The sealing components tend to gum up the important stuff I use only synthetic oil. I like Mobile One 0-40, but there are many good ones.

8) synthetic oil has amazing performance, but will find every possible leak point. That's just going to happen. But an oil leak doesnt hurt anything, other than your driveway. They are usually not worth fixing. They get fixed eventually during a serious repair.

Thanks for the good response to my post. Please report back if this works for you so that other owners can benefit from the feedback. Photos are always good too.
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  #12  
Old 05-18-2016, 02:10 AM
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I'm definitely going to try this tomorrow now that the pcvs have just arrived. Smoke comes only from the passenger side exhaust. And this gets me thinking......when I was doing the water pipe and the upper timing case gaskets, I opened only the driver side intake manifold and cleaned the vent pipes on that side only. I was able to change the passenger side timing cover without opening that side intake. Any way, we shall see tomorrow if cleaning both side stops the smoking....

By the way, in your case the smoking stopped immediately, it wasn't a gradual process, right?

I will be doubly, utterly shocked if this fixes my smoking issue
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  #13  
Old 05-18-2016, 06:41 PM
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N62B48 smokes no more!

I'll definitely be replacing and cleaning those CCV parts identified by stiubhartach - many thanks for the pictures and further info.
But for now though, my smoking issue seems to have been cured by a process of trial and error, using quantities of gradually thicker oils in sequence, as follows:
1) pre-insp. II - no smoke evident
2) post-insp. II and fresh Castrol Edge 5W-30 full synthetic oil - big clouds of blue smoke after extended idle
3) drained out 4L of oil and replaced with 4L of Shell 5W-40 full synthetic - still moderate smoke after extended idle, maybe a little less than before
4) drained out 5L of oil and topped up with 5L of Penrite 10W-50 full synthetic oil - no more smoke!

I now plan to run the engine on this cocktail for 5,000 km/3,000 miles, then dump it and refill with 8L of fresh Castrol Edge 5W-40 Titanium, full synthetic.
Will report back the results.
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  #14  
Old 05-18-2016, 10:28 PM
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My smoking problem ended immediately after the repairs.

If you are unsure where the smoke is coming from, you can check the intake manifold or CCV hose for oil.

Here's some links.

Oil in CCV hoses after replacing CCV - E46Fanatics

Can I use this (Oil Catch Tank) with the ESS TS ? - Page 10 - E46Fanatics

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  #15  
Old 05-19-2016, 01:41 PM
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Great link.

https://www.mann-hummel.com/corp/pro...e-ventilation/
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  #16  
Old 05-19-2016, 04:27 PM
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Thanks for this information. I will be cleaning my oil passages and changing diaphragms as a result. I always thought this was VVS, but I never have smoke on startup... so I've got my fingers crossed this will sort it.
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Old 05-19-2016, 06:14 PM
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Both pipes, pcv and pcv surfaces were generally clean ... I got a sinking feeling in the pit of me wallet

I chatted with my indy and asked him how come there's no smoke at startup if the valve stem seals are leaking. He says when the engine is off there's no vacuum, the leak occurs only under high vacuum conditions. Is this explanation plausible?
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  #18  
Old 05-19-2016, 07:59 PM
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Quote:
Originally Posted by X5only View Post
Both pipes, pcv and pcv surfaces were generally clean ... I got a sinking feeling in the pit of me wallet

I chatted with my indy and asked him how come there's no smoke at startup if the valve stem seals are leaking. He says when the engine is off there's no vacuum, the leak occurs only under high vacuum conditions. Is this explanation plausible?
Would be plausible only if the idle vacuum is greater than the vacuum present at higher rpm, which seems wrong to me.
Have you considered trying the thicker oil solution?
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  #19  
Old 05-19-2016, 08:14 PM
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Quote:
Originally Posted by 4.8iS Le Mans_NZ View Post
Would be plausible only if the idle vacuum is greater than the vacuum present at higher rpm, which seems wrong to me.
Have you considered trying the thicker oil solution?
At WOT (wide open throttle) there is very little manifold vacuum. At idle because the throttle plate is close and there is just a tiny gap for air to pass through, the vacuum is High. Don't believe this, connect a vacuum gauge at an manifold inlet such as the brake booster and see the vacuum at idle and the vacuum when the throttle is opened.
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  #20  
Old 05-19-2016, 08:25 PM
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I would be very surprised if a valve stem seals were leaking enough under vacuum to show visible smoke, but not leaking while the engine is off. Did you try pouring oil into the return passage and watching flow down? That's a hard place to clean.

This I some basics on valve seals:

Automotive Valve Seals: Symptoms Smoke at Startup


This is great post on the CCV system in the n62. Specifically post 18 has some more tests.

http://www.bimmerforums.com/forum/sh...8#post25763768
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