Welcome to the DoItYourself Forums!

To post questions, help other DIYers and reduce advertising (like the one on your left), join our DIY community. It's free!

Seized Engine


tucker2's Avatar
Member

Join Date: Jan 2006
Posts: 3

01-02-06, 02:39 PM   #1  
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?

 
Sponsored Links
v8driver's Avatar
Member

Join Date: Sep 2005
Posts: 767

01-02-06, 05:37 PM   #2  
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

 
James Sanders's Avatar
Member

Join Date: Jul 2005
Posts: 101
CANADA

01-02-06, 05:52 PM   #3  
Yeah, looks like both valve lifters are the same.

 
puey61's Avatar
Member

Join Date: Apr 2004
Posts: 3,224
NY

01-03-06, 03:02 AM   #4  
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.

 
tucker2's Avatar
Member

Join Date: Jan 2006
Posts: 3

01-04-06, 03:59 PM   #5  
seized engine

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.

 
tucker2's Avatar
Member

Join Date: Jan 2006
Posts: 3

01-04-06, 04:05 PM   #6  
seized engine

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?

 
Search this Thread