smokey 10 hp briggs

[TECH270154]

i have a shredder 10 hp briggs horizontal engine POWERBUILT no. 204412 type 0276EI . with aprox 150 hrs with a guarantee ended ( 4 years ) the maintenance of the equipment was always maintain
the engine start to smoke last fall ++ with high consumption of oil while i was shredding leaves .so i assume it was the head cylinder gasket blown.
so starting the week i overall the engine head cylinder .everything was done thoroughly with the best of my knowledge .(i have a mechanical degree )
SURPRISE ,when i start the engine , ... the engine work very fine but smoking very badly .i can not understand why , because everything was done right, (new gasket,torquing sequence,cleanliness ) right now i am thinking of a badly sit gasket or a broken oil ring .first thing i gonna try to dump the old gas in case . then what ....
PLEASE HELP ( BRIAN ) and everyone else for advise

thanks

[bobodu]

If the oil doesn't burn off then a leakdown test will have to be done.

[bgsengine]

1) Check crankcase breather by pulling the breather hose off the air cleaner housing and see if it blows oil; Could be breather read bad, worn out , bent, failed, or carbon stuck under it.
2) check oil level, is it correct (Number of ounces of oil)?
3) Carburetor leaking gas maybe? if it leaks into crankcase it'll result in overfill of oil 9and thin oil)
4) Got a fresh clean air filter (or run it with filter off in a clean environment)
Could be oil in muffler that needs to burn off first - that can take a while depending on how big the muffler is (how much oil it will hold)

Other than that, leakdown test is in order. (I'd do that first, but assuming you don't have the leakdown tester, the above steps may be done before investing in tooling.)