Starter on Yardman lawn tractor.

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  #1  
Old 08-07-13, 08:26 AM
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Starter on Yardman lawn tractor.

I have a Yardman lawn tractor I bought about 10 years ago, it runs good, but is had to start. I would barely turn over so I bought a new battery and it still does it. The battery tests good, I put new cables and solenoid on and it still continues to turn over slowly. I took the starter apart and the brushes are good cleaned it all up , but it still did not start. I'm sure it's the starter since it's getting 12 volts to it when I try to start it. Looking for help and/or advise.

Thanks,
Bob
 
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  #2  
Old 08-07-13, 09:45 AM
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Does it turn over any different with the plug out? If so it could be a compression release or a valve adjustment problem. Valves usually work with a .005 clearance.

If that is in good shape, and there is still a big difference in with/without plug, the flywheel key could be sheared, creating a timing problem.
 
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Old 08-07-13, 10:52 AM
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I never thought of the flywheel key. If the key was sheared it should run rough when it does run. It runs good when I do get it started. i haven't pulled the plug yet and turned it over, I'll have to do that tonight.

Bob
 
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Old 08-07-13, 11:38 AM
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UnionCreek, Marbobj is correct. The valves need adjusting
 
  #5  
Old 08-07-13, 11:50 AM
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It's a Tecumseh engine. I'll have to check out how to adjust the valves on it.

Thanks,
Bob
 
  #6  
Old 08-07-13, 01:14 PM
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It wouldn't necessarily run rough if the timing was advanced a few degrees. And that could still cause hard starting.
 
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Old 08-07-13, 01:24 PM
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Marbobj,

Thanks for the info. I'll have to dig my manuals for that engine and see if I can find any specs on the valves. I've had it over 10 years and used it hard at times, so I could use a little tuneup.

Bob
 
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Old 08-07-13, 02:19 PM
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.005 on both the intake and exhaust works on most engines like that.
 
  #9  
Old 08-07-13, 06:03 PM
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You need to adjust the valves.
 
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Old 08-07-13, 07:27 PM
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Yup adjusted the valves and it runs like new. Was able to find the spects in my owners manual.

Thanks for all the help.

Bob
 
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Old 08-09-13, 09:14 AM
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When I adjusted my valves I did it based on what I saw on YouTube. They showed when adjusting the exhaust valve that the intake valve was compress all the way. I looked at some YouTube videos last night and found a video of adjusting the valves and they did it with the piston at top dead center. Which way is correct or does it matter.

Bob
 
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Old 08-09-13, 09:40 AM
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Top dead center, then continue to rotate until the piston has moved ~1/4 inch down on the power stroke. This is where you adjust the valves.
 
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