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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 05-24-2010, 07:54 PM   #1
nikoloza
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Join Date: Nov 2009
Location: Long island NY
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My Ride: 325i
Valve cover question

Hi I replaced my VCG a month ago with OEM one and did it with sealants on halfmoon areas. I had a smoke coming from
hood yeasterday after
driving hard. I checked and it is valve cover leak. Why it happened and do I have to buy a new gasket agan or is ok to use the old one. Is there other way to solve this problem
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Old 05-25-2010, 04:11 AM   #2
shanneba
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The TSB for the Oil separator indicates it can cause the failure of the Valve cover gasket. If your CVV is clogged with sludge it could cause the valve to stick.
ECS has a kit with the updated "cold weather" version of the CVV.
I would purchase another gasket.

This Service Information bulletin supersedes SI B11 08 03 dated February 2009.
designates changes to this revision
SUBJECT
Oil Separator – Cold Climate Conditions
MODEL
E39 (5 Series) all with M54 engine
E46 (3 Series) all with M54 engine
E53 (X5) all with M54 engine
E60 (5 Series) all with M54 engine
E83 (X3) all with M54 engine
E85 (Z4) all with M54 engine
SITUATION
Certain areas of the US experience extremely cold climate conditions during the winter months. A small number of
vehicles in the above-listed Series have experienced problems ranging from leaking or broken valve covers to complete
engine failure.
CAUSE
Moisture accumulating in the engine oil separator; hose to oil dipstick guide tube; or the orifice in the dipstick guide
tube can freeze. When this occurs, depending on the position of the internal valve, it may either cause high crankcase
pressures (stuck closed) resulting in valve cover leakage and/or breakage, or cause an oil hydro-lock condition (stuck
open), which could result in engine damage.
CORRECTION
Replace the crankcase vent valve, crankcase vent hoses, and dipstick guide tube.
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Old 05-25-2010, 10:16 AM   #3
nikoloza
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thanks for reply but I forgot to mention that I replaced Oil separator and all vent hoses with OEM same one from the factory a few weeks ago.Everything was good in the beginning. VCG started leaking just recently.
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Old 05-27-2010, 12:29 AM   #4
paraklas
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Was the valve cover torqued properly and within specs?
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Old 05-27-2010, 10:23 AM   #5
nikoloza
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I did not use a torque wrench. I just tightened them by feel. do you think this can cause a leak again. what about to re tighten them again with torque wrench?
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Old 06-09-2010, 04:22 AM   #6
Alex323Ci
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Quote:
Originally Posted by nikoloza View Post
I did not use a torque wrench. I just tightened them by feel. do you think this can cause a leak again. what about to re tighten them again with torque wrench?
that can absolutely be the issue.
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