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06-26-2019, 10:49 AM
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Join Date: May 2007
Location: Central Alberta
Posts: 21,399
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Lawnmower problem
Looking for some advice, certain I'll find it here.  I have a Craftsman riding mower with a 13.5 Briggs and Stratton Gold engine. It runs fine for a few minutes, till it warms up , I assume, then shuts down. I just changed the oil and put 10/30 in it. I'm wondering if the oil thins sufficiently to trigger the low oil shut down. 30 weight oil was suggested as a warm weather alternative. Didn't seem to do it before I changed the oil and I don't want to change it again if I can help it . 
Grizz
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"Indeed, no human being has yet lived under conditions which, considering the prevailing climates of the past, can be regarded as normal."
John E. Pfeiffer The Emergence of Man
written in 1969
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06-26-2019, 11:00 AM
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Join Date: Apr 2009
Location: edmonton
Posts: 3,116
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What oil did your mower originally call for? Did you overfill it? If you overfill it your crankshaft could be stirring the oil adding air, this turns the oil into an espresso foam like consistency which would cause a low oil pressure at the sensor.
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06-26-2019, 12:09 PM
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Join Date: Dec 2008
Location: Camrose
Posts: 45,262
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10w30 flows like 10 weight oil when cold, but like 30weight oil when warm, so at operating temperature 10w30, and 30 oil, are the same viscosity.
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Only accurate guns are interesting.
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06-26-2019, 12:27 PM
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Banned
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Join Date: Mar 2012
Location: Legal, Alberta
Posts: 51
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Do you have any spark? sounds like a possible coil issue, cracked etc., they are fine when cold and then short out when they heat up.You could bypass the oil sensor then crank it over to see if you have any spark.
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06-26-2019, 01:02 PM
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Moderator
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Join Date: Jul 2008
Location: A bit North o' Center...
Posts: 11,207
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I'm with steyrman - check the coil first. Also ensure your fuel vent is working properly...
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06-26-2019, 04:42 PM
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Join Date: Jul 2015
Location: Calgary, AB
Posts: 1,036
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Sounds like a carb issue... Like the float bowl isn't filling at the proper rate.
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06-26-2019, 10:26 PM
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Banned
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Join Date: Feb 2015
Location: south calgary
Posts: 2,281
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Quote:
Originally Posted by elkhunter11
10w30 flows like 10 weight oil when cold, but like 30weight oil when warm, so at operating temperature 10w30, and 30 oil, are the same viscosity.
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Yup
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06-26-2019, 04:41 PM
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Banned
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Join Date: Nov 2013
Location: Manitoba
Posts: 1,529
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Quote:
Originally Posted by Grizzly Adams
Looking for some advice, certain I'll find it here. I have a Craftsman riding mower with a 13.5 Briggs and Stratton Gold engine. It runs fine for a few minutes, till it warms up , I assume, then shuts down. I just changed the oil and put 10/30 in it. I'm wondering if the oil thins sufficiently to trigger the low oil shut down. 30 weight oil was suggested as a warm weather alternative. Didn't seem to do it before I changed the oil and I don't want to change it again if I can help it .
Grizz |
I would check for spark, when it shuts down. 30 weight oil is thicker than your multi grade 10-30 when it is at operating temp. If that is all you changed, and it was functioning fine before, it would seem that could be the issue.
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06-26-2019, 10:27 PM
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Banned
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Join Date: Feb 2015
Location: south calgary
Posts: 2,281
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Quote:
Originally Posted by gtr
I would check for spark, when it shuts down. 30 weight oil is thicker than your multi grade 10-30 when it is at operating temp. If that is all you changed, and it was functioning fine before, it would seem that could be the issue.
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Nope
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06-26-2019, 10:33 PM
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Banned
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Join Date: Feb 2015
Location: south calgary
Posts: 2,281
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Quote:
Originally Posted by Grizzly Adams
Looking for some advice, certain I'll find it here. I have a Craftsman riding mower with a 13.5 Briggs and Stratton Gold engine. It runs fine for a few minutes, till it warms up , I assume, then shuts down. I just changed the oil and put 10/30 in it. I'm wondering if the oil thins sufficiently to trigger the low oil shut down. 30 weight oil was suggested as a warm weather alternative. Didn't seem to do it before I changed the oil and I don't want to change it again if I can help it .
Grizz |
Spark is likely the issue, put a Bosch plug in it, if your not moving when it warms up and quits then fuel issues are doubtful but, change the plug, change the fuel, , dump out the tank, clean the bowl, your oil is fine if the level is right, if it continues then look for a grounding kill switch wire that has rubbed through, lastly the coil. Or maybe a bad safety switch on your seat.
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06-27-2019, 07:18 AM
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Join Date: Aug 2017
Posts: 6
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Can you keep it running with the choke on partially or full when it's warm if so, your carb is in need of a good cleaning, and it's likely full of varnish. Remove it, take it ALL apart and clean it, OR go buy a new one. There's a good chance a replacement is fairly cheap.
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06-27-2019, 07:37 AM
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Join Date: Jan 2010
Location: Edmonton
Posts: 6,470
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All most sounds like a vapor lock problem. When you changed the oil did you play with the gas line and possibly move it closer to the engine ? When it gets hot it produces a vapor lock. I would check that the gas line is not close to any hot engine parts and add seafoam to the gas. Seafoam will cure any varnish problems in the carb, if that is the cause. Then check other things if that does not cure the problem. Start with the cheapest and easiest things first.
Let us know the solution to the problem when you get it fixed.
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 Kim
Gonna get me a 16" perch.
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