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24 HP Briggs & Stratton Intek problem

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24 HP Briggs & Stratton Intek problem

Old 09-30-2013, 03:50 PM
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Default 24 HP Briggs & Stratton Intek problem

So, Im out mowing the pasture a few months ago and shut the mower off.....
Tried to restart, but it made a hell of a noise and backfired...

Googled the problem....and found some issues with my model motor...

It seems that the valve gudes will move and cause the valve to lock up, and bends the pushrod. Some pushrods just lay in the valley bent......others have found their way into the crankcase.

Mine was right there......I was able to beat on the end of the valve and it pushed the guide back. It worked for a while, but locked up again a few days ago.

Pulled the heads off the mower today and dropped the valves out.
Peened the valve guides back down and ordered a gasket kit.

Will wait to post back after parts arrive and I have this baby back together....

Some folks actually drilled and tapped the head and put a set screw in to hold the guide.....I think I will try with an alternate fix...and that is peening the end of the guide against the head.

It seems as if this has happened to quite a few folks....anyone here have an issue? If so, what was your fix?
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Old 09-30-2013, 04:13 PM
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Make and type of engine are good, but would age and brand of mower change the thinking?
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Old 09-30-2013, 04:19 PM
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I have that engine on my toro zero turn, Five years now cutting 2 acres. Hope this is not a common problem. First I've heard of it.
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Old 09-30-2013, 05:08 PM
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My mower is 7 yrs old and has 430 hrs on it..

It seems that both heat and oil issues can cause the problem....

I was a little behind on one of my oil changes and used some older Mobil oil that went dark on me quickly. It was not being circulated properly and that causes the valve stem to move the guide....

I am hearing that using Marvel mystery oil in the gas will help the upper cylinder lubrication.

So far I will have less than $100 in the repairs. I almost bought new heads but didn't. I pulled this mower down to the cylinders in about an hour...so it isn't a difficult job. If I have one more issue it gets new heads....they are only $85 each from online sources...
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