Bad valve guides anyone n54?
- Thread starter Zareh335
- Start date
"still have smoke"?
If you're getting a smoke cloud on decel, 90% it's turbo seals. 9% pcv system, and 1% it's bad piston rings/excess blowby. I've talked with numerous owners with the smoke on decel issue and basically every time it's been turbo seals.
If you're getting a smoke cloud on decel, 90% it's turbo seals. 9% pcv system, and 1% it's bad piston rings/excess blowby. I've talked with numerous owners with the smoke on decel issue and basically every time it's been turbo seals.
Ive changed 3 sets of turbos.. you can notice oil on the exhaust valves i have an external pcv too.. i also have smoke on cold starts.. and the smoke is not there 24/7 just sometimes downhill and always after start ups
most likely the guides. Ive only seen this once, super neglect E60 and had 3 oil changes in 50k miles. By 90, even with changes every 5k, the damage was done.
or ring seal... vacuum pulling oil past the piston rings on decel.
OP, sounds like it's time to pull the head/rebuild. If the oil was from the turbo seals, you would find oil in the charged air piping and/or the rear turbine housing into the exhaust. If it's from rings, valve stem seals, or piston rings, your only real choice is to eliminate the valve stem seals (which you already did) and then the next two require a tear down to determine... not much else left to do except measure the guides and look for damage. With the head off you should be able to see the factory crosshatch well enough to determine if there is a problem with the rings.
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