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Briggs 16hp single- intermittent smoke

3846 Views 18 Replies 6 Participants Last post by  Richard-tx
I started up my used 16hp single Briggs engine on my 8162 yesterday. It smoked a touch on start up and ran OK. After about 2 minutes at WOT it started belching out gobs of blue smoke and had a loss of power. It was most impressive the amount of smoke it produced. It was like the Blitz Fogger on my father's SC.

I decided to let it run and then it stopped smoking after a minute and ran just fine. I started it again today and it did the same thing. I am thinking the problem is a cracked piston. Once it thoroughly heats up, the crack closes and it stops burning oil. Does that seem reasonable?

Maybe something with the crankcase ventilation system?

Is there anything else it could be?

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Pulse type pump on this one Don. I suppose it could still be the pump but I think that is a stretch.

I am thinking that the issue is the crankcase ventilation system. Oil is getting thrown up when cold and it is getting dumped into the carb. I will disconnect it tomorrow and try again.
Nature of the beast. I figured as much. Thanks Jimmy.
I will likely do something with the crankcase ventilation since it seems is the source of the issue. I will verify that later today.

I have to put a new needle and seat and gasket in the carb anyway so that means I will have to disassemble it. Those updraft carbs can be a pain to work on but the crankcase never fills with gas if the needle doesn't seat.

I am on the hunt for a replacement engine. I would love to pick up a CCKA or B48 for it.
Definitely a blow by issue. I will have to tear it down and fix it. It seems like a reasonable engine. Odd that it will smoke as bad as it does for a short period of time and then stops.
It is not an OHV engine. It is a single cylinder flat head. I will be looking at it later this week. 2 days of rain are moving in so that brings everything that is to be done outside the shop to a halt temporarily.

I am likely looking at a major overhaul. I likely won't do it. I am thinking of just selling the engine on CL or scrapping it. I would rather spend the money overhauling a Onan twin. I believe I get more bang for the buck. The trick is to find a suitable Onan twin. I really need to find two of them.
I am going to stick with the Onan twin engines. They are smoother. I would use 4 cylinder engines if someone made one that was the right size and was air cooled.
Yup...that would be cool. I would figure out something for an electric start. It would turn a couple of heads at the next mow-in.
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