oil everywhere breather problem?

I was driving along and things did not sound right to begin with, then I
smelt burning and pulled over in a layby in time to see smoke coming through
the vents.

There was oil everywhere, it seems to have come from the filler vent. The
only other thing visibly ammiss was that the air cleaner hose had come off
the top of the carburettor.

Is it possible that a lack of vacuum on the crancase vent on the rocker
cover, caused by the air hose being adrift could have caused the valve to
stay shut causing a build up of back pressure with no where to vent but the
filler ?

Engine seems to be running fine, so is there any other cause of a sudden oil
pressure build up anyone can think of.


--
Larry
Series 3 rust and holes

Larry wrote:

> I was driving along and things did not sound right to begin with, then I
> smelt burning and pulled over in a layby in time to see smoke coming
> through the vents.
>
> There was oil everywhere, it seems to have come from the filler vent. The
> only other thing visibly ammiss was that the air cleaner hose had come off
> the top of the carburettor.
>
> Is it possible that a lack of vacuum on the crancase vent on the rocker
> cover, caused by the air hose being adrift could have caused the valve to
> stay shut causing a build up of back pressure with no where to vent but
> the filler ?
>
> Engine seems to be running fine, so is there any other cause of a sudden
> oil pressure build up anyone can think of.
>
>

There should be no significant vacuum in the hose between the aircleaner and
the carburetter, so this should make no difference. The usual reason for
the symptoms you describe are excessive blowby past the rings. Depending on
how long the engine has been breathing unfiltered air and the conditions,
this can cause rapid ring and bore wear. In very dusty conditions terminal
damage can be done in a few minutes, so even in not very dusty conditions
if the air has been unfiltered for some time this could be the problem.
The engine could still run fine, although it would be down on power.
A compression test would seem to be indicated.
On the other hand, the hose off the carby could be unrelated, and you could
have damaged or stuck rings, although these usually happen on one piston
only and lead to rough running.
JD

Everything is fine this morning, no smoking, no evidence of excessive
pressure.

Got a new rubber to fix the air cleaner hose though so it don't come off
again.

--
Larry
Series 3 rust and holes




"JD" <[email protected]> wrote in message
news:[email protected]...
> Larry wrote:
>
>
> There should be no significant vacuum in the hose between the aircleaner
and
> the carburetter, so this should make no difference. The usual reason for
> the symptoms you describe are excessive blowby past the rings. Depending
on
> how long the engine has been breathing unfiltered air and the conditions,
> this can cause rapid ring and bore wear. In very dusty conditions terminal
> damage can be done in a few minutes, so even in not very dusty conditions
> if the air has been unfiltered for some time this could be the problem.
> The engine could still run fine, although it would be down on power.
> A compression test would seem to be indicated.
> On the other hand, the hose off the carby could be unrelated, and you
could
> have damaged or stuck rings, although these usually happen on one piston
> only and lead to rough running.
> JD

Spoke too soon, it is still blowing oil out of the breather when I drive it
hard

More expence.

--
Larry
Series 3 rust and holes


"Larry" <[email protected]> wrote in message
news:[email protected]...
> Everything is fine this morning, no smoking, no evidence of excessive
> pressure.
>
> Got a new rubber to fix the air cleaner hose though so it don't come off
> again.
>
> --
> Larry
> Series 3 rust and holes
>
>
>
>
> "JD" <[email protected]> wrote in message
> news:[email protected]...