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17.5 hp Briggs and Stratton smoking


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  #1  
Old 07-31-2010, 02:17:05 PM
Unmechanical Unmechanical is offline
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Default 17.5 hp Briggs and Stratton smoking

I hope someone can help me with this problem. I have a 17.5 HP Briggs and Stratton on a Troybuilt riding mower. It starts up just fine, but after a few seconds, the engine bogs down and I get a bunch of blue/gray smoke. After a few more seconds, the smoke stops and it starts running normally for another 10 seconds or so. Then is starts all over again. Any thoughts on what's wrong? Thanks
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Old 07-31-2010, 03:05:17 PM
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The Engineer The Engineer is offline
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Default Re: 17.5 hp Briggs and Stratton smoking

two things
check your oil for fuel contamination these are known for float needle leaks which causes fuel to drain into the crank case and then an oily mess blows back through the breather back into the carb and into the engine
also known to blow head gasket into pushrod cavity also causing exsess blowby oil out the breather resulting in constant smoke haze to darkblue grey smoke
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Old 07-31-2010, 05:03:07 PM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: 17.5 hp Briggs and Stratton smoking

These engines are also very suseptable to cylinder and head warpage due to overheating. The heads and cylinders must be kept clear of dust and debris. Do not over fill crankcase with oil.

Andrew
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Old 07-31-2010, 09:57:53 PM
K D Redd K D Redd is offline
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Default Re: 17.5 hp Briggs and Stratton smoking

You may have a head gasket leaking compression into the push rod chamber. I have seen several of the Briggs OHV engines do this. When I pull them down, I draw file the head deck of the block and the head gasket surface of the head to be sure they are flat. When you do this the original cutter mark where the head and the block surface were cut appear. It looks to me as if they use a cutter with 3/8 inch inserts and the feed is so each insert was take it's full 3/8 of an inch. when you hit i t with the file the first few times the surface looks VERY rough. If you will draw file both surfaces to remove these marks, you will have a better sealing surface than what the engine left the factory with IMHO.

Kent
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Old 08-01-2010, 09:24:37 AM
Tony Rye Tony Rye is offline
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Default Re: 17.5 hp Briggs and Stratton smoking

maybe the airfilter are the choke being sucked closed then opening
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Old 08-01-2010, 07:46:38 PM
Unmechanical Unmechanical is offline
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Default Re: 17.5 hp Briggs and Stratton smoking

Thanks everybody - I changed the oil and ran it for 45 minutes, without any smoking and bogging down stopped. I'm assuming there was some fuel in the oil.

One more question: Do you think there is still a bigger problem, like the head gasket, or is this something that will build up over time and I just need to keep on top of the oil changes?

Thanks again!
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