Posted by Goose on August 20, 2015 at 19:39:10 from (70.198.8.64):
We have a Poulan garden tractor with a 24 hp B&S engine. 320 hours on the meter. We don't use it to mow as much since we got a zero turn but it's still handy to have around.
Anyway, about a year ago a pushrod bent. I took the pushrod out and straightened it. Then I figured out the rear steel brake line on a Chevy pickup parts vehicle was a perfect press fit over the pushrod. I cut a piece of the brake tube about an inch shorter than the push rod and pushed the brake tube over the pushrod with about a half inch on each end. While reinstalling the push rod, I found the valve was stuck and I had to tap on the rocker arm to free the valve. Put it together and it ran fine-until today when it did the same thing with a different valve and pushrod.
I did my same bit with the piece of brake tubing. Then I figured while I had it apart, I might as well reinforce the other two pushrods for insurance. Found one of them with a slight bow in it. That one must be a slightly larger diameter than the first two 'cause the brake tube would not push over it. I straightened that one and put the whole works back together. It's running fine, now, for the time being. I just ordered two new pushrods online. I'll see what they look like.
Is this a known problem with the Briggs OHV engines? We had a 20 hp that went over 900 hours before we got rid of it and never had this problem. What would cause the valves to stick? Carbon on the stem?
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