Need help new bad issue...536 909800 engine - Snowblower Forum : Snow Blower Forums
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post #1 of 20 Old 02-05-2014, 01:14 PM Thread Starter
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Need help new bad issue...536 909800 engine

Was using the snowblower today craftsman driftbuster 3 stage with tecumseh motor on it...all of a sudden sounded like a chain slapped something and the motor quit dead in its tracks...I tried to pull start it...cannot even budge the rope and then tried to electric start it with same results. I hope it isnt true but y it is seems and acts like the motor locked up. Funny thing is, when i checked the oil this morning it was right at the full mark...when i checked it after it quit it was in the OK zone about in the middle. Any ideas or suggestions? can you get parts for the old motor? Is it worth fixing?
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post #2 of 20 Old 02-05-2014, 02:21 PM
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It's likely you threw a rod. See if you can turn the flywheel backwards with a wrench.
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post #3 of 20 Old 02-05-2014, 03:37 PM
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Take a look under the electric starter to see if you can see a crack or hole in the block that is usually a place where the rod exits or cracks the block.

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post #4 of 20 Old 02-05-2014, 05:51 PM
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Yep, sounds like a broken rod. Sounds like you are the next contestant on the Predator engine swap!

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post #5 of 20 Old 02-05-2014, 08:57 PM Thread Starter
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Well...it was full of oil when I started and when it quit is was in the ok zone on the dipstick. No holes, was no knocking or loss of power. I read on another site about a magnet on the flywheel coming off and loving the flywheel? This thing just stopped dead on its tracks. The electric starter doesn't seem like it engages the flywheel and when I try to pull start it I can't budge the crank or pull the rope.
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post #6 of 20 Old 02-05-2014, 09:03 PM
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Anything is possible. I would start with removing the belt cover and belts. Then try turning the crankshaft both directions with a wrench and see if it will move either way.

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post #7 of 20 Old 02-05-2014, 10:50 PM
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Stop using the electric starter. It will only cause more problems at this point. That or you'll just break it or the gears too.
The engine if still good should spin with the recoil starter or pull the belt cover and try turning it by hand or put a wrench on the crankshaft. Try it in both directions. If you can't get it to spin you need to start taking it apart to find the problem or find another engine.
When you have tried to start it is it in neutral ?? Maybe one of the drive chains snapped and locked the wheel drive up so the belt is stopping the engine from turning. Is the belt loose on the engines drive pulley ??
I haven't pulled up yours yet, I have a gear transmission, yours might be friction wheel so not the chains I'm thinking of.

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post #8 of 20 Old 02-06-2014, 07:20 AM
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Take out the spark plug. Using either the crank shaft (pulleys coming out of the motor with belts off) or the flywheel (under the pull start mechanism) see if the motor will move backwards.

If you threw a rod it is possible that the crank shaft internally is jammed up against whatever is left of the rod. usually you can turn the motor backwards if this is the case. If the motor will rotate backwards but the cylinder does not move you threw a rod for sure.

Other possibilities are the piston siezed to the cylinder or as you suggested a flywheel magnet came off and is jammed up under the flywheel. Also you could have an issue with the tractor or auger section and removing the belt will allow the motor to turn freely.

Whatever it is you are going to have to tear into things to figure it out. I would start with taking the belt off of the crankshaft pulley and isolating the motor or the blower unit as the source of the lock up. Get that far and we can guide you though what comes next.
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post #9 of 20 Old 02-06-2014, 11:08 AM
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Motor issue

Here's a thread I put together the other year that included tearing down most of a 10HP Tecumseh: Evaluating a used snowblower purchase and proceeding with a rebuild in Project How To's Forum
Might be helpful
Here's another one on tearing down the basics on a 7HP
Evaluating a used engine in Project How To's Forum

Neither gets into getting into the crankcase, but there are videos on the web that cover that.
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post #10 of 20 Old 02-06-2014, 02:16 PM Thread Starter
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Well, the verdict is rod went through the block right into the starter as "colored eggs" had said. Mine had the 8hp tecumseh engine on it...will this predator motor work? what is its hp? will i notice a increase or decrease in performace from power? here in IL we get some snow...tuesday we had 13", the week before 8"...so i need something reliable that will start after a truck ride to my sisters (so I dont have to shovel it) and something that has enough power and budget friendly.
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