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Tecumseh Engine Valves

My Tecumseh 6.5 hp LV195XA has excessive valve clearance, how do I know if it's the valve or tappets that need replaced and is it even worth it? I'm do this job for someone. I think with the condition of the oil, I'll find more internal damage It's a self-propelled lot of work to take apart.

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  • Eugene Smith Jul 12, 2013

    When I say excessive valve clearance I'm get a reading over 0.010, the setting is 4-8 thousance. would it be the valve stem wore down or the lifters, or maybe the cam?

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Ask your how old is it how long will it last best replace the moter aslong as the rest of the machine is in good shape i would do the cheaper than buying a selfpropelled and you no what you got make sure to go trough the machine put down parts it needs add them to the new motor half rebuild it

Posted on Jun 07, 2014

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How do I fix the tapping sound from the engine when i accelerate after it has reached running temperature


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Valve Clearance Valve clearance is there to allow the valves to cool in between combustion events (spark), and to make sure the valve closes properly and contains the combustion explosion. You need to cool the valves a little bit, the exhaust valve moreso than the inlet, as it's what sees the most heat as spent burnt gases go past it into the exhaust port. Run too little clearance and you'll cause the valve to "weld" a little bit to its' seat every time it closes, and then take seat metal off again when it opens. Do this enough times and you burn out the valve seat and need the head reconditioned. However, by running less clearance, the valve stays open for that little but longer, and you get more air in and out of the motor, and make more power. Run too much clearance and your motor just sounds like a diesel and loses power and tappet rattle annoys you while you're driving, so it's better to err on the side of caution.
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Nine Method I've never really gotten into doing this, takes too much time and maths for my liking :P Rotate the engine through its' range of movement, as one valve is "on the rock" of its' max lift, subtract the valve number from 9 and that's the tappet you should be setting. For example, if #8 valve is open, set clearance on valve #1. If valve #7 is open, set clearance on #2. And so on.
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