Briggs 17hp leaks oil when hot

I have a Murray riding mower witha briggs 17 hp 42a707 engine that when it warms up after about 30 min or so it starts to leak oil at the base of the left(as ur sitting in the seat) cylinder leaks oil out very quickly..... any suggestions will be greatly appreciated...

 

Well I say....first if it's been awhile since you've changed the oil (over 3-4 months) your engine might be tring to tell you to do so now.oit gets then over time.

If it's got reasonably new oil in it I'd say that your oil sump plate gasket is blown out there,or the bolt at that position has come lose.Or the sump plate has a crack in it there.in any case the motor has to come off the frame.But most likely it's just a blown out gasket.

have fun---good luck

 

but i am way more knowledgeable about car engines than small engines and this is the first vertical shaft motor i've ever had so while appreciated your advice is over my head without diagrams or instructions.....

Thank you for your answer and quick reply ..... as for the first part it has had regular oil changes twice yearly and had fresh oil when the problem started. if it helps i noticed that That cylinders exhaust is Much hotter than the other side and makes the muffler get red ..... the spark plug does have the correct gap .030 and is the same as the other one ..... and the motor has no problem starting or running but i don't want to make it any worse

 

Ok first of all take take the battery cables off.take the throttle cable off the engines governor plate on left (as setting in the seat).next take the ground wire off,right under the throttle clamp that you just took off.And take the fuel line off the carb and run back in tank or just cremp it off where it wont leak.Now on the other side of the engine,the big cable that runs from the sterter to the solenoid has to come off.use two 7/16 wrenches for this so as not to twist the connection.
Next, jack the front of mower up and take the pin out that holds the deck to the mower frame (between the front wheels).Then take both belts off the stack pulley (right under the engine).
Depending on if the mower frame has a hole in it large enough to pull the stack pulley through it or not you might have to take the pulley off.If so you'll need an extention to reach the 5/8 bolt that holds it onto the crankshaft.Then take the 4 engine mount bolts out,rase the engine and place upsidedown on a table.
Take out all 8 1/2" bolts that hold the oil sump on,then with a rubber malet gently bump the sump plate off the crankshaft.replace the gasket and reassemblt in reverce order.


Now as far as the muffler getting red hot,sounds like the valve clearance on that side had sleped a littie.after you get the oil leak repaired,replay back with the engines type number and somebody can look you engine up an tell you the specs.

 

That helps alot, i'll check into getting the replacement gaskets and hope that works and maybe when i ajusted the plug back out to .030 from .027 will help too haven't really run it since i did that ....

thanks again