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Lawn mower oil overflow

I have a Craftsman self-propelled lawn mower with a 725 series Briggs and Stratton engine, model # 917.370920. I bought the mower in May and have been using it every weekend for the past 2 months. Two out of the last three times I have used it, the oil cap came off and oil overflowed all over the place. The first time this happened, the oil level was the result of the supplied bottle of oil only and was the same it had been for over a month during which there were no incidents. The second time this happened, I check the oil right before using the mower, and the level was midway between MIN and MAX. Each time this has occurred within the first 10 minutes of mowing, but I was then able to finish mowing the rest of the lawn (about 2 hours) without any problems. Can you think of any possible reasons why this might be happening?

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Craftsman , Lawn Mowers
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4 Answers from these members:
Manage My Life
Thanks for the tip. I checked the dipstick and the O-ring is present and appears to be in good condition. I mowed my lawn today and didn't have any problems, so unless you can think of anything else that could be causing it, then I'll just keep my eye on it. If it keeps happening, I'll just bring it to a service center.
by Manage My Life
July 28th, 2012
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Manage My Life
Make sure the oil plug (dipstick) has a little O-ring around the top of the threaded area. If there is no o-ring there, that may be the cause of this happening. The O-ring will help keep the plug tight when it's screwed in all the way.





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by Manage My Life
July 21st, 2012
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Manage My Life
Thanks for the link.
by Manage My Life
July 21st, 2012
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Joseph Perez
An oil leak is something that should be repaired quickly to avoid making a mess. I am sorry for the inconvenience and I did manage to find a link that will provide you with some good information on what may be causing the oil leak. I hope this helps in getting the oil leak fixed while you wait for your expert response.
by Joseph Perez Earned 1,551 community points in Craftsman
July 19th, 2012
Answered in 10 minutes
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