Seized Engine

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  #1  
Old 01-02-06, 02:39 PM
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Angry Seized Engine

In the fall I got myself a snowthrower from one of those airline/hotel milage awards programs. (Tecumseh LH195SP engine)
I didn't use it more than about two hours when it froze up! The engine was locked up tight even though there was plenty of oil in the crankcase. It looked like I may have overloaded it since the bearing on the pulley side failed.
I took it apart and found that the internals were in good shape except for the bearing/cover. The head, piston, cylinder, conrod bearing all in good shape.
At one point during the repair both valve lifters slid out of the crankcase and I may have put them back wrong thinking they were the same length.
I purchased a new cover and gasket, cleaned the crank, reassembled the engine, and put in some fresh synthetic Briggs & Stratton oil and tried to start it.
It sputtered and started but would not stay running. It would backfire through the carb.
My questions: Are the timing marks on the cam/crank gears aligned or are they one tooth off? I put it together with the marks aligned.
Are the valve lifters the same length?
 
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  #2  
Old 01-02-06, 05:37 PM
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valve lifters should be the same (not sure, don't work on tec's hardly) though the valves could be out of adjustment, check the flywheel key just in case of a partially sheared key. if you lined the marks up, they should be good
 
  #3  
Old 01-02-06, 05:52 PM
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Yeah, looks like both valve lifters are the same.
 
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Old 01-03-06, 03:02 AM
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You most likely did shear the flywheel key and thereby threw off the ignition timing. When reinstalling the 'wheel, be sure to torque the nut to 40 ft./lbs.
 
  #5  
Old 01-04-06, 03:59 PM
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seized engine

Originally Posted by v8driver
valve lifters should be the same (not sure, don't work on tec's hardly) though the valves could be out of adjustment, check the flywheel key just in case of a partially sheared key. if you lined the marks up, they should be good
The flywheel key is OK. I had the flywheel off when I took the Crank out.
the blower was running like a dream until I overladed it and burned the pulley bearing so I think the valves should be set OK. Like I said, I only have a couple hours on this machine.
 
  #6  
Old 01-04-06, 04:05 PM
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seized engine

Originally Posted by puey61
You most likely did shear the flywheel key and thereby threw off the ignition timing. When reinstalling the 'wheel, be sure to torque the nut to 40 ft./lbs.
The key is good. I had the flywheel off when I pulled the crank. I read somwhere that the cam gear teeth are installed one tooth off on Tecumsehs with "float type" carb. Does that make sense? And which way?
 
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