18.5 els500 Briggs & Stratton, oil in gas

flhtcdudeSeptember 15, 2009

I have a Huskee lawn tractor with a B7s 18.5 hp els500 engine on it. It would start and run for about 10 seconds, blowing smoke and oil out the exhaust, then stop running. Further inspection found a large amount of gasoline in my crankcase. We changed the oil and now it runs good. My question is how in the world would that much gas get into the crankcase? My oil was so thin it was running through into the cylinder and drowning out the spark. Any ideas?

Thank you for reporting this comment. Undo
walt2002

Sure, very typical of a leaking carb float needle valve. Happens all time often ending in a ruined engine which is why you always want to check the oil level before starting the engine. Over full and low are both bad.

I suggest you install an in line gas shut off valve and use it whenever the engine is not running.

Walt Conner

    Bookmark   September 15, 2009 at 12:09PM
Thank you for reporting this comment. Undo
flhtcdude

Thank you for your quick reply. Engine still seems in good shape, maybe I caught it in time. I had mentioned to my son maybe if we put a petcock on it and used it that it may fix the problem. If I took the carb apart and cleaned it good think it would be fixed or is it a recurring problem?

    Bookmark   September 16, 2009 at 12:53AM
Thank you for reporting this comment. Undo
walt2002

"If I took the carb apart and cleaned it good think it would be fixed or is it a recurring problem?"

Yes, maybe and yes. Putting in a new float needle may stop it - - - for a while.

You see, this has happened every since there were small engines but there was a "weep" hole in the bottom of the carb and if the float needle leaked, the gas dripped out, you saw, smelled it and did something about it.

Then, your always watchful and caring EPA decided that wasn't nice and made the mfg. do away with the weep hole so now the gas runs into the cylinder, on into the oil and often ruins the engine.

I guess there is less pollution in making a new engine than a few drops of gasoline.

Walt Conner

    Bookmark   September 16, 2009 at 8:57AM
Thank you for reporting this comment. Undo
rdaystrom

I have never seen a ruined engine from gas in the oil. They are brought in because of smoking and gas coming out of the muffler but never any damage done.
Think about it. If a 2 cycle engine can survive on 32:1 gas oil ratio ten other engines can survive on a 1:1 ratio.
It is possible to damage one that fills up and gets a hydraulic lock. Maybe that's what Walt was talking about.

    Bookmark   September 16, 2009 at 4:40PM
Thank you for reporting this comment. Undo
walt2002

"I have never seen a ruined engine from gas in the oil."

Good gosh, where have you been?

Walt Conner

    Bookmark   September 16, 2009 at 5:42PM
Thank you for reporting this comment. Undo
rdaystrom

Walt, What type of failures have you seen from gas in the oil? I can see that hydraulic failures may happen like bent rods and blown head gaskets. What I meant to say is that I have not seen lubrication related failures.

    Bookmark   September 16, 2009 at 6:22PM
Thank you for reporting this comment. Undo
walt2002

I have seen dozens of them on both the later flatheads but more predominate with the OHV engines. They throw rods when apparently full, generally over full, oil and gas. Got 2 31 series in boxes in the shop from that right now.

Now I don't what to get in another "discussion" with you but that analogy of 2 cycle oil/gas and mater of operation with needle bearings through out and pulling gas/oil mix thru the crankcase, comparing that to the entirely different operation of 4 cycle and mostly plain bearings??

Walt Conner

    Bookmark   September 16, 2009 at 6:35PM
Thank you for reporting this comment. Undo
rlkaess_frontiernet_net

I have a 18.5 els 500 briggs & stratton. It uses a lot of oil. smoke blows out the exhaust and it will quit after about 45 minutes. let it cool and it starts again. Still smokes and when you go to shut it off it will backfire if you don't let it cool off for a couple of minutes. It will use about a half a quart of oil for every hour of use.

    Bookmark   April 10, 2011 at 8:25PM
Thank you for reporting this comment. Undo
walt2002

You do realize that you are posting on an 18 month old thread? Anyway, I may have info that will help you, most likely head gasket, address below, put in proper format and remind me plus I am having a bunch in Internect Connetivity problems so don't think I am ignorming you.

Walt Conner
wconner5 at frontier dot com

    Bookmark   April 10, 2011 at 9:37PM
Thank you for reporting this comment. Undo
jfallon_nh-hydraulics_com

I NOTICED THAT I HAVE GAS COMMING OUT MUFFLER AND WONT START, SHOULD I START BY TAKEN OFF CARBURATOR BOWL??????

    Bookmark   May 21, 2011 at 2:11PM
Sign Up to comment
More Discussions
Best self propelled walk behind mulching mower
Hey Guys and Gals, in the market for the best all around...
mowman07
Charger for/charging a Toro GTS 6.75 hp
I recently acquired a several year old Toro GTS 6.75...
bkay2000
Tom Boy Lawnmowers????
Has anyone seen or heard of Tom-Boy push lawn mowers????...
bekellog
Anyone ever use an electric mower?
As you may know, ethanol in our gasoline is really...
FrogmoreFarm
airens 1534 mini zoom no crank
I've got a 15hp Briggs motor that I attempted to jump...
baldo6878
Sponsored Products
Joy Carpets Kids Building Character Kids Area Rug - 1551-C
$239.99 | Hayneedle
Cherry Creek Rug 3' x 5' - RED/IVORY
$299.00 | Horchow
Yellow Metal Chair
$99.99 | zulily
LEM Bar Stool Vinyl Set of 2 in Black
$279.00 | LexMod
Exterior Lighting Series Brown Two-Light Exterior Light
$32.40 | Bellacor
Serena & Lily Origami Wallpaper
Serena & Lily
Besa Sail 13 1/2" High White Outdoor Wall Light
Euro Style Lighting
Alanna Oil Rubbed Bronze Six Light Pendant
$798.00 | Bellacor
© 2015 Houzz Inc. Houzz® The new way to design your home™