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#1237914 - 09/17/08 08:25 PM B&S engine spewing blue smoke all of a sudden
crw Offline


Registered: 05/31/05
Posts: 1688
Loc: Pocatello, ID
Over the last three mowing sessions, my riding lawn mower is blowing blue smoke. It's about 1/3 of a quart for every hour! I'm getting nauseated sitting behind it from all the smoke.

Right now I have new oil (SAE 30) in there. Still doing it.

I took it in to someone... he changed the plug and gave me a inline fuel shut off-valve and sent me on my way. Gee thanks.

He also suggested that if the problem remained (it has), then I would likely need a new or rebuilt carburetor. The theory being (I guess) that the carb is dumping oodles of fuel into the piston and causing some oil to burn in addition to the fuel. Anyway, I'm hesitant to take it back to this guy for fear of getting on a new parts merry-go-round.

What do you think? New carb, damaged engine, or something else?
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#1237919 - 09/17/08 08:31 PM Re: B&S engine spewing blue smoke all of a sudden [Re: crw]
crw Offline


Registered: 05/31/05
Posts: 1688
Loc: Pocatello, ID
I should have added, there is no evidence of a head gasket leak. And, the problem cropped up "all of a sudden". One day about three weeks ago, the problem started, and it's getting slightly worse during each mowing.

Thanks for any advice you can provide.
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#1237928 - 09/17/08 08:45 PM Re: B&S engine spewing blue smoke all of a sudden [Re: crw]
Shannow Offline


Registered: 12/12/02
Posts: 31681
Loc: Oz
Did you upend it to clean it ?

Better half did that to my mower, and oil leaked through and saturated the ais cleaner.
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#1237929 - 09/17/08 08:46 PM Re: B&S engine spewing blue smoke all of a sudden [Re: crw]
Turk Offline


Registered: 02/03/06
Posts: 9095
Loc: MN
Well...

How does the engine sound, the same as before or some noises??

Does it run smooth or like the choke is partially on??

I would spray a good carb cleaner or pour Seafoam in with a HOT engine and change the air filter while you're at it.

Then after that, go deeper.



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#1237937 - 09/17/08 08:57 PM Re: B&S engine spewing blue smoke all of a sudden [Re: Turk]
crw Offline


Registered: 05/31/05
Posts: 1688
Loc: Pocatello, ID
Yes, let me give some more details...

No, it hasn't been turned over. Its a riding mower... I have about 2/3 of a acre that I mow weekly.

I cleaned out the air filter already.

Engine sounds about the same. No choke on this engine. I was thinking about carb cleaner or Seafoam... that might be the next step.

My most fundamental question is, would a bad carb cause my engine (17 hp Briggs and Stratton "INTEK") to spew blue smoke? The smoke comes out strongest when the engine is stressed, for example if I hit a patch of thicker grass, the engine will respond to compensate, and at that moment I'll get an extra strong puff of blue smoke.
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#1237942 - 09/17/08 09:00 PM Re: B&S engine spewing blue smoke all of a sudden [Re: crw]
Turk Offline


Registered: 02/03/06
Posts: 9095
Loc: MN
Hummm...

Get that Carb Cleaner or Seafoam in it right away before the next mowing!!

Also, clean and lube all linkage on/to the carb.

Then - Write us in the morning.
_________________________
03 GMC Sierra 4x4 200k M1 0-40+PU
00 Saturn SL2 89 YO Lady Car 92k, Edge Ext
98 Saturn SC2 Rare "Red Hot" 165k, Edge Ext
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#1237949 - 09/17/08 09:15 PM Re: B&S engine spewing blue smoke all of a sudden [Re: Turk]
crw Offline


Registered: 05/31/05
Posts: 1688
Loc: Pocatello, ID
I will... hopefully the next mowing isn't for another 8 days or so...
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#1237956 - 09/17/08 09:25 PM Re: B&S engine spewing blue smoke all of a sudden [Re: crw]
ksJoe Offline


Registered: 07/09/08
Posts: 715
Loc: Ks
Does the smoke smell like burning oil? I usually smell an oil burning car before I see the smoke. If its oil, that's probably rings/valves/etc

Since the smoke is visible.... If it is a twin cylinder, you could take the exhaust pipe off and see if both cylinders smoke the same. If so, I'd suspect the carb (since its common to both). If only one smokes, that's an issue on one cylinder (rings, valves, etc).

Do they put valve guide seals on those? If it has overhead valves, you could pull the valve cover and check the valve guide seal, and see the valve guide is broken. Thats kind of a long shot though.

-Joe

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#1237968 - 09/17/08 09:45 PM Re: B&S engine spewing blue smoke all of a sudden [Re: crw]
tom slick Online   sleepy


Registered: 05/26/03
Posts: 8927
Loc: Central Coast, Calif.
You've got an oil problem, messing with the carb won't fix it. The fact that it is blue smoke and your oil usage is far beyond acceptable are the key indicators.

I'd re-ring it at a minimum.


Edited by tom slick (09/17/08 09:46 PM)
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#1238005 - 09/17/08 10:22 PM Re: B&S engine spewing blue smoke all of a sudden [Re: tom slick]
Steve S Offline


Registered: 01/20/03
Posts: 18449
Loc: East of IGO
Is there some kind of crank case breather PCV type of setup on the engine? What is the oil level?
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#1238027 - 09/17/08 10:59 PM Re: B&S engine spewing blue smoke all of a sudden [Re: Steve S]
MONKEYMAN Offline


Registered: 06/24/04
Posts: 1637
Loc: St. Louis
I was in a hurry one day with my parents rider. I believe a 16.5 hp Briggs. Checked the oil and started mowing. I was blowing smoke out the muffler/burning oil which had never happened before. Then I saw I left the dipstick unscrewed. Simply screwed it in place and the problem was gone. So, could you possibly have a leak somewhere drawing in air like I had?
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#1238028 - 09/17/08 11:01 PM Re: B&S engine spewing blue smoke all of a sudden [Re: Steve S]
pushrod Offline


Registered: 08/17/05
Posts: 56
Loc: Maryland
I had a OHV briggs single cylinder tractor that had the rings
unseat and spin on the piston until the ring gaps almost lined up
vertically. Oil pushed right past them to get burned with the
gas. Horrible smoke. This was on its second season!

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#1238029 - 09/17/08 11:09 PM Re: B&S engine spewing blue smoke all of a sudden [Re: pushrod]
Mamala Bay Offline


Registered: 02/21/04
Posts: 2074
Loc: USA
These small engines in most cases there isn't enough oil to burn to SEE blue smoke visually to that extent. It's a small engine not like car engines.

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#1238031 - 09/17/08 11:16 PM Re: B&S engine spewing blue smoke all of a sudden [Re: crw]
Mamala Bay Offline


Registered: 02/21/04
Posts: 2074
Loc: USA
 Originally Posted By: crw
Over the last three mowing sessions, my riding lawn mower is blowing blue smoke. It's about 1/3 of a quart for every hour! I'm getting nauseated sitting behind it from all the smoke.

Right now I have new oil (SAE 30) in there. Still doing it.

I took it in to someone... he changed the plug and gave me a inline fuel shut off-valve and sent me on my way. Gee thanks.

He also suggested that if the problem remained (it has), then I would likely need a new or rebuilt carburetor. The theory being (I guess) that the carb is dumping oodles of fuel into the piston and causing some oil to burn in addition to the fuel. Anyway, I'm hesitant to take it back to this guy for fear of getting on a new parts merry-go-round.

What do you think? New carb, damaged engine, or something else?


If you are losing 1/3 qt of oil every hour you got to have a leak...there is no way a small engine can burn off that much oil..do you notice the engine running abnormal . Most time to getting a new carb it wouldn't start to begin with. Unusual!

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#1238182 - 09/18/08 08:07 AM Re: B&S engine spewing blue smoke all of a sudden [Re: Mamala Bay]
crw Offline


Registered: 05/31/05
Posts: 1688
Loc: Pocatello, ID
One thing about the dipstick idea... I saw this on another thread, The dipstick screws on, and there is a place on the cap where I think a gasket ought to be... but no gasket is there. That might explain it (maybe) but it doesn't fit the model of why all of a sudden this started happening. Well, there was one time that I took the cap off, and if the gasket went flying at that moment, that might explain it...... (the plot thickens)
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