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Old 11-24-2012, 04:15 PM   #1
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Default Flywhee; FREE PLAY

I just bought a used Sirio .12 engine and when I installed the clutch and turn it around with my fingers there's at least 1/8 of a turn free play when the piston is at TDC. That is when the piston is at TDC I can turn the flywheel backwards and forwards 1/8 of a turn and the piston doesn't move.

There must be a problem with this engine and I don't want to start it in this state. HELP PLEASE?
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Old 11-24-2012, 09:34 PM   #2
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I just bought a used Sirio .12 engine and when I installed the clutch and turn it around with my fingers there's at least 1/8 of a turn free play when the piston is at TDC. That is when the piston is at TDC I can turn the flywheel backwards and forwards 1/8 of a turn and the piston doesn't move.

There must be a problem with this engine and I don't want to start it in this state. HELP PLEASE?
Remove the back plate and check the rod.
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Old 11-24-2012, 10:56 PM   #3
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Originally Posted by ShowtimeMX View Post
I just bought a used Sirio .12 engine and when I installed the clutch and turn it around with my fingers there's at least 1/8 of a turn free play when the piston is at TDC. That is when the piston is at TDC I can turn the flywheel backwards and forwards 1/8 of a turn and the piston doesn't move.

There must be a problem with this engine and I don't want to start it in this state. HELP PLEASE?
Conrod play at the crank or gudgeon pin or both.
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Old 11-24-2012, 10:56 PM   #4
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Thanks. Have just removed the back plate and the movement is due to the slack in the rod and crankshaft. There's some serious movement there.
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