The paper cartridge air filter on my Briggs and Stratton tractor mower,
is continually getting clogged up with oil. The filter is mounted upper
most on the engine. Has anyone any suggestions please, as to why oil
would be blown out of the intake?
On Wed, 09 Sep 2015 16:25:11 +0100, Harry Bloomfield wrote:
Wander over to the B&S website and download the manual for your
engine. At the very least you'll get an exploded parts diagram which
normall gives enough clues as to where a part is and what has to come
off to get at it.
Either the engine is very worn and or the crankcase is pressurised, if it
has a breather into the air filter, as most do. The crankcase generally
has an air inlet somewhere, and the connection to the air filter draws
fumes into the engine so they are burnt.
If the pressure in the crankcase is excessive - worn piston rings or valve
guides - a considerable amount of oil can be forced into the intake.
First thing to check is the crank breather system is clear.
*I don't feel old. I don't feel anything until noon. Then it's time for my nap.
Dave Plowman email@example.com London SW
On Wed, 09 Sep 2015 15:54:30 +0100, Harry Bloomfield wrote:
If it's anything like a car, there will be a pipe from the crankcase to
the air filter assembly.
It's worth having a look inside the pipe - there should be a flame
arrester (like a spiral wire jobbie). They often become clogged with
carbonised oil, and block the pipe leading to pressure backing up into
the crankcase and going goodness knows where.
My mistrust over people who call themselves "mechanics" derives in part
from the fact that over the years, no one seems to have any idea what
that part did, and just threw them in the bin. Probably along with all
the nuts and bolts they had left over after a service. You know - the
ones that weren't really needed.
On Thu, 10 Sep 2015 00:17:05 +0100, Dave Plowman (News) wrote:
That sounds similar to the advice given to the frequent flyer who was
worried about the 1 in 5 million odds of there being a bomb on the
flight. In this case, the fact that the odds of there being *two* bombs
on a flight were 25 billion to one against it was suggested "Bring your
own bomb!" :-)
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