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7 Series - E38 (1995 - 2001)

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  #1  
Old 10-16-2011, 12:52 PM
pbstrickland pbstrickland is offline
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Mein Auto: 2001 740iA Sport
01 740i - Smokey starts

My 2001 740I has 129K on it, I have replaced the OSV twice including 4 weeks ago. at 100K I replaced the valve cover gaskets do to a smokey start in the morning from the left side. Now I have lots of smoke from both tailpipe from time to time (Erratic). Anyone have suggestions?
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  #2  
Old 10-16-2011, 05:10 PM
ozibimmer ozibimmer is offline
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Mein Auto: 2000 E39 535i Sports
Hi
What colour is the smoke?
Have you had the codes read?
Does you model have the PCV because it is common with E38 to have PCV valve failure and this will cause smoke but I think it is only on the early models.

http://www.meeknet.co.uk/E32/PCV/Index.htm

http://www.bimmerfest.com/forums/arc.../t-290657.html

Could be just condensation
http://forums.bimmerforums.com/forum....php?t=1022143
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  #3  
Old 10-16-2011, 05:44 PM
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joyism5 joyism5 is offline
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First let's get it straight : OSV is NOT the rear cover of the intake. The manufacturer called that part PCVV - Positive Crankase Ventilation Valve. It's true that if you mention to somebody PCVV they don't know what that means. Because they are used with domestic cars not german. You stated you replaced OSV twice . I don't think you payed $5000 + to change the OSV twice since is located behind the timing chain (23 Hours labor).

Now if you still have the smoke you have 3 possibly causes :
I
The PCVV that you replaced, is not OEM, or if it is You still have a leak @ the pipe between OSV and PCVV(# 5 in here http://www.realoem.com/bmw/showparts...55&hg=11&fg=15) or the O rings related to it.
II
The Real OSV just failed on you, (mine too) check picture attached. The purpose of the OSV is to act like a cyclone separating oil drops / oil vapors, sending the drops back to the oil pan and oil vapors to the intake via pipe/PCVV. Now, if the OSV failed , it will not do the separation, and when you start the engine, vacuum is maximum, the engine will "suck" the oil drops making the smoke @ start up.
III
Valve stem seals worn . If they worn, when you stop the engine, the oil that is sitting on top of valves will leak via stem seals and will sit on intake valves. When you start the engine, the oil will drop in the combustion chamber and burn. Check attached picture and look around the valve stem seal for a blackened area. There the place where the oil is coming down.

# II and #III they both act the same with smoke @ start up. One way to find out which one apply to you is to perform a cylinder leakage test to see if you have the worn valve stem seals. Another trick is to check is you still have the intake heavily wet after replacing the OEM PCVV and pipe with related O-rings. If you have wet intake means the OSV is bad. Valve stem seals will not wet the intake, they will produce the smoke.

#II is expensive in labor since requires timing chain labor. #III is even more expensive since requires valve job/cylinder head removal on top of the timing chain labor. Good Luck with yours.

Do not let this going ON unfixed because, oil consumption will build carbon on valves, which will result in loss of compression or valve failure (my case). Side effect includes damaging the converters, O2 sensors,... ETC.

I have both : the failed OSV and the worn seals.

I know ...long post but hopefully is a good lesson/reference out there. Good Luck !
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  #4  
Old 10-22-2011, 08:24 AM
pbstrickland pbstrickland is offline
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Thanks for all the input, Can option 2 be done out of the shop? on a scale of 1-10 10 being expert what kind of skill is needed?
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Old 10-22-2011, 12:32 PM
Brummel Brummel is offline
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Mein Auto: 97 740il
Have a read at this thead, it will help you understand and learn more about the OSV http://forums.bimmerforums.com/forum...=Cyclone+Valve
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  #6  
Old 10-26-2011, 07:37 AM
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joyism5 joyism5 is offline
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Quote:
Originally Posted by pbstrickland View Post
Thanks for all the input, Can option 2 be done out of the shop? on a scale of 1-10 10 being expert what kind of skill is needed?
You need special tools for the timing ($500), or you can build for yourself some of them. I would say that setting the timing on M62TU is about # 8 on a scale 1-10 , where 1 is changing the spare wheel and 10 is assembly the engine. First make sure which one apply to you and look around for a decent shop who works on these cars. In the mean time use a thicker oil and change it 3000miles or less.
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