Craftsman riding mower flywheel wont rotate after valve adjust

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  #1  
Old 05-11-12, 03:32 PM
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Craftsman riding mower flywheel wont rotate after valve adjust

I HAVE A CRAFTSMAN RIDING MOWER WITH A 17 HP MOTOR. I ADJUSTED THE VALVES AND THE ENGINE FIRED RIGHT UP. I REPLACED THE COVER AND TRIED TO START ENGINE AGAIN AND NOW THE FLYWHEEL WONT ROTATE. CANT EVEN ROTATE BY HAND. CAN SOMEBODY PLEASE HELP
 
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  #2  
Old 05-12-12, 05:46 AM
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First, do not force the flywheel to get it to turn. then take the valve cover back off and check the push rods to see if they're all in place. They may have fallen out and are causing the problem.

If they are in place at both ends of the push rod, loosen the rocker nuts and see if you can turn the flywheel. If you can, readjust the valves, double check everything to make sure it's all in place and stick it back together.
 
  #3  
Old 05-12-12, 10:59 AM
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Thank you I'll give it a try and let you know
 
  #4  
Old 05-12-12, 11:04 AM
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Also check the starter gear, it may have jammed into the flywheel, locking it up.
 
  #5  
Old 05-12-12, 11:31 AM
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Ok ive checked the push rods and readjusted valves still wont move. I took spark plug out to take compression off and still nothing.
 
  #6  
Old 05-12-12, 11:34 AM
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You will have to walk me through that one I know a little about motors but dont have the first clue where the starter gear is.
 
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Old 05-12-12, 12:09 PM
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On the end of the starter, where it contacts the flywheel.
 
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Old 05-18-12, 11:47 AM
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Ok just now got back to the mower the top valve is moving and the bottom one isnt how do I make sure the push rod is in the right place?
 
  #9  
Old 05-18-12, 06:52 PM
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Your flywheel turns now? If the bottom push rod isn't moving, it isn't in place. Use a flashlight and look.
 
  #10  
Old 05-19-12, 11:44 AM
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Yes the flywheel is moving and I actually got the bottom one to move but now it wont start it turns about a half turn and stops. I readjusted valves again and still the same thing like it has to much compression or something.
 
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Old 05-19-12, 07:31 PM
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How are you adjusting them?
 
  #12  
Old 05-19-12, 07:43 PM
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.406 with filler gauge dont seem to affect a thing
 
  #13  
Old 05-19-12, 08:19 PM
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they should be about .004 (that's 4 one thousandths of an inch) and are you doing it with piston 1/4 inch past top dead centre compression stroke. .406 is almost 1/2 inch unless if the .406 is in millimeters then I think it's still too much as I calculate .004 inches to be .101 millimeters
 
  #14  
Old 05-20-12, 05:57 AM
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I was told to adjust each when the top was completely closed and the then adjust bottom then vice versa. This is in millimeters. I will try .004. I'm knew to this stuff and I appreciate the help
 
  #15  
Old 05-20-12, 10:20 AM
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Put the engine at top dead center on the compression stroke, then turn it clockwise enough to put the piston 1/4 inch down from top dead center, then adjust the valves to .004" (four thousandths of an inch).
 
  #16  
Old 05-20-12, 02:21 PM
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Briggs says to do it as Cheese said and I did a test and did it your way and Briggs way and the readings were different so I advise doing it as Cheese and Briggs say. Remember the .004 is in inches.
 
  #17  
Old 05-22-12, 04:14 PM
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Ok readjusted valves again still does same thing but I noticed that it's the top valve that is causing it to hang up. The bottom is smooth and easy to move when it gets to top thats when it hangs up and hard to rotate by hand.
 
  #18  
Old 05-22-12, 08:48 PM
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Do you have the plug in when rotating by hand? It's going to be hard to rotate by hand when you have good compression. How did you conclude that the top valve was causing it to hang up. It will be hard to turn just before the top valve (exhaust opens) because that is the compression stroke as the piston hits top dead centre. As piston heads down on the power stroke to bottom dead centre then the top valve will begin to open for the exhaust stroke. Things actually seem normal.
 
  #19  
Old 05-23-12, 09:23 AM
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Ok if this seems normal what else would cause it to hang up? When trying to start it will turn about a turn then get hung up.
 
  #20  
Old 05-23-12, 09:52 AM
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I'd say it's one of four things:

The battery is low,
There is oil and/or gas in the cylinder,
The valves are still not properly adjusted,
The compression release on the camshaft is broken.
 
  #21  
Old 05-23-12, 11:35 AM
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Ok guys got it started mowed my front yard and now all of a sudden I have a new problem. It is like the gears have went out it now can't go forward or backward. Any suggestions? I checked the belt it's not broken seems maybe a little lose. When I'm moving the gears it's not engaging the pulleys. What would cause this?
 

Last edited by Lora466; 05-23-12 at 12:28 PM.
  #22  
Old 05-23-12, 04:40 PM
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So what was the fix to get it started?

Sounds like your transmission belt came off.
 
  #23  
Old 05-23-12, 06:16 PM
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I took the spark plug out and adjusted valves again let it rotate a few times without compression on it then hooked jumper cables to it and she fired up... Thanks for your help on that... Where is the transmission belt? I checked the one on top the deck.
 
  #24  
Old 05-23-12, 09:10 PM
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It's above the deck belt.
 
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