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Snowblower engine seizing up


ko49028's Avatar
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07-01-09, 02:57 PM   #1  
Snowblower engine seizing up

I have acquired a Simplicity 755 snow blower with electric start with a Tecumseh engine. I apologize for no other numbers as it was repainted. Based on an online manual, I believe the engine is: 755M 7 HP ENGINE, Tecumseh, Electric Start (Model 1693983) Engine Model #OHSK 70 Engine Type # 72523D

The previous owner claimed he was using it and the engine quit and seized last season. There is the correct amount of oil in it. I started working on it today to find that the engine turned with a socket/ratchet put to it. I was encouraged, cleaned out the carb, and applied the electric starter to it. It fired and ran for a few minutes, tightened up, and quit. I applied the ratchet again to find it would turn with ample force applied, but barely (essentially seized again). Now that it has cooled completely, it turns again.

Any advice on next steps to repairing it (or gathering further information) would be greatly appreciated.

 
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07-01-09, 03:33 PM   #2  
Take the cover off & check all the belts & pulleys... If you'r luckey, one of them is siezing up....Even remove the belts to take the unit out of service than run the engine again... Hopefullay it's a siezed pulley but it almost sounds like a rod starting to sieze to the crankshaft... Was the oil really black & thick looking &/or very low when you picked it up??? Roger

 
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07-02-09, 09:58 AM   #3  
For clarification, when I was running it and it quit, none of the drive systems were engaged. The oil level was fine. The oil does appear to be fairly black, but not thick.

 
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07-02-09, 12:37 PM   #4  
Remove the shrouds and recoil housing from the engine. Sounds like you may have a mouse/squirrel/chimpmunk nest in there causing the engine to heat up and "seize".
If no nest is found, I would clean the carb. Carb blockage will cause the engine to run lean causing it to run hot and seize.
I would also change the oil before running it again.

 
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07-02-09, 06:34 PM   #5  
When the engine runs on a snowblower,, All the drive systen is live,, & is controlled by the rubber friction wheel in the drive unit under the engine...Try what indypower said & if no luck,, Than disconnect the belts... It may be the engine,, or under in the transmission....Good Luck,,, Roger

 
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07-28-09, 02:22 PM   #6  
To finish out this thread... indypower1 had it pegged. I thoroughly cleaned the carb and changed the oil. However, much to my surprise, I removed one of the shrouds that practically hugged the cooling fins of the cylinder and found a large mouse nest; I have no idea how they were able to fit up there, but that was the culprit for overheating. It seems to run like a top now. Thanks to all for your input. Beer 4U2

 
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