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Fairly New Briggs 18 Blow By Issue


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#1 skidduht OFFLINE  

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Posted July 09, 2014 - 07:33 PM

So i got the sunstar running today, i was mowing and the motor has lots of blow by. the motor has been replaced not to long ago, it still kinda looks new. this tractor has been sitting for 12 years and is running on old gas. i was thinking that the rings are sticking some, so i put some kroil in the crankcase and ran it around for a while in hopes it may free up the rings. is there anything else i could do?mabey a vent is clogged? Any help would be great. Thanx

#2 boyscout862 ONLINE  

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Posted July 09, 2014 - 08:00 PM

As I recall, Kroil is like PB Blaster. I would not put that in an engine. Change the oil, replace the air filter if its dirty, replace the old gas with fresh, run it and then tune the carb. If it still smokes, add Marvel Mystery Oil(MMO) to the gas at one tablespoon per gallon of gas. Use the engine for 20 hours and see if it gets better.  MMO tends to clean and freeup rings.  I hope that the MMO works for you. It has been working in cars for me for 47 years. Good Luck, Rick


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#3 KennyP ONLINE  

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Posted July 09, 2014 - 08:11 PM

Sounds like stuck rings to me! It may take many cycles of running then letting it set for them to break back loose. And I will second the MMO, but put some in the oil too.


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#4 superaben OFFLINE  

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Posted July 09, 2014 - 10:01 PM

Thirding the Marvel Mystery Oil!

 

Are you getting a load of oil around the air intake?

 

Ben W.


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#5 skidduht OFFLINE  

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Posted July 10, 2014 - 01:22 AM

Thirding the Marvel Mystery Oil!
 
Are you getting a load of oil around the air intake?
 
Ben W.

yes, it chokes out the motor with the filter in, and oil builds up the the bottom of the filter housing.
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#6 boyscout862 ONLINE  

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Posted July 10, 2014 - 08:55 AM

When you change the oil, check that it isn't overfilled. Check the breather too. Good Luck, Rick



#7 HDWildBill OFFLINE  

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Posted July 10, 2014 - 09:15 AM

If the oil appears to be over filled check the oil for gas contamination.  If you do have gas in the oil, Change the oil before running it again and also check to see if the float is sticking or dirt holding open the needle valve.


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