ohv adjustments

Old 03-15-02, 08:35 PM
J A Boggan
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Question ohv adjustments

I have a 16 hp tecumseh engine on a riding lawnmower. It has a verticle crankshaft with verticle valves (intake on top). The problem that I'm having is that when I adjust the valves (on the power stroke), whenever I get the sightist clearance, the pushrod falls out. Are you suppose to adjust the valves with the engine running? This is the first time I have worked on an engine with OHV. What am I doing wrong?
Old 03-15-02, 08:48 PM
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By "falling out", do you mean it drops out of the socket in the rocker arm? How are you measuring the valve lash? Engine should be OFF, piston at TDC on power stroke, like you said, and measure with a feeler gague between the valve stem and the rocker arm. There should be a "pocket" in the rocker arm that holds the pushrod in place. If it comes off, maybe it isn't properly positioned on the lifter in the block.

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