BMW: blue smoke at higer revs

On Tue, 02 Sep 2003 14:31:30 GMT, "aghasee" <court> wrote:
 

See "Dealer Overfills Engine With Oil! Help!" thread?

"daytripper" <com> schreef in bericht
news:com... 
wrote: 
the 
few 
Sounds 
The 

The engine has not been overfilled and is genuine BMW, not a V**vo.
Thanks anyway.
--
Prosper
-A collision at sea can ruin your entire day-

(E-mail address is forged - reply to group please)

"aghasee" <court> wrote in message news:<6R15b.15085$telenet-ops.be>... 


Are you sure it's blue and not black? Blue smoke indicates oil in
your exhaust. Have a look at your sparkplugs - are they coated with
oil?

Given the age and apparently lack of attention to the car you may want
to check the engine's compression in case it has worn valve guides
and/or piston rings.


Michael

"aghasee" <court> wrote in message
news:X665b.15721$telenet-ops.be... 
immense 
a 


If the engine hasn't been run regularly, then I would suspect a sticking
ring. You can try running some oil additive through the engine to see if you
can free up the stuck ring. My 325e with 325,000Km had a sticking ring and
this proceedure restored the compression on a low cylinder.

t0ph3r

"Michael Low" <inter.net> schreef in bericht
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news:<6R15b.15085$telenet-ops.be>... 
the 
few 
Sounds 
The 

Definitely blue, as blue as blue comes... :-)
 

No. Coffee-with-milk kind of color.
 

The car belonged to an old man, who bought it new. Car has only done 60k
miles, has been serviced at a BMW dealer garage (full service history),
bodywork in very good shape except from a few "parking scratches".
I doubt there is major compression los as the car tears the stones out of
the earth when pulling away, there is no obvious lack of power whatsoever.
It fires up at the first flick of the key. The engine runs smooth as silk
also.
 

Another knowledgeable person mentioned these valve guides, he said the valve
guides are rubber-like things where the valves go through and due to the
lack of usage they sort of die out and lose their flexibility, could this be
correct?

Thanks
--
Prosper
-A collision at sea can ruin your entire day-

(E-mail address is forged - reply to group please)

> 
valve 
be 

That would be valve stem oil seals :-) If the engine has them then yes they
do harden with age and become crap at there job and let oil thou' but this
is normally found on a car after standing over night (oil seeps past and
fills the bore) or when on the overrun the high vacuum sucks oil past the
seals and then when you hit the gas again a could of smoke appears.

Don't know in this case - I suspect a stuck or broken ring but they sound
like a "tingle" at idle and you should be able to hear it as you rev gently.

Smoke is normally bad BUT could be something simply - not a very high
mileage but again things do break. Might be worth getting a decent local
shop to have a quick peek with some co/gas tools and see what readings that
shows up.

Steve

"aghasee" <court> wrote in message
news:s2k5b.16992$telenet-ops.be...
 

Yes. The valve guides themselves are metal sleeves, usually iron or bronze.
However, your engine has rubber valve guide seals, which can definately "die
out" with age. I bet this is your problem.

Both the seals and the valve guides themselves are prone to wear in these old 4
cylinders. It's unlikely your guides are worn at only 60k, but it's possible.

Unfortunately, doing any head work on this engine probably requires removing the
head.

Matt O.

"Matt O'Toole" <com> wrote in message
news:rMJ5b.6819$gnilink.net... 
valve 
this be 
bronze. 
"die 
old 4 
possible. 
removing the 
The OP stated that the engine produced the blue smoke at higher RPM, not
at idle or taking off from and idle or when decelerating. These conditions
subject the intake manifold to high vacuum and it is this high vacuum that
draws oil past the intake valve guide/seals. If the oil smoke appears at
high RPM, then the condition is likely caused by sticking or broken oil or
compression rings. The OP stated that the engine has been sitting for an
extended period of time, a perfect condition to cause the rings to stick. A
good oil treatment to free sticking rings is in order, it works in many
cases.

t0ph3r