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BEWARE BEFORE YOU BUY!

7.8K views 11 replies 6 participants last post by  dmaurer15  
I suspect there is more to this than a failed plastic gear. There are lots of snowmobiles with plastic gears for the oil pumps.

The key would be how did it fail. Did it get stripped out or did it break? Did it warp? Stripped usually means there was resistance somewhere else that caused it. Breakage can be the same, but could also mean bad part to begin with. Warping is a sure sign of overheating.

Running in low gear all the time is actually hard on it. Engine revving up higher, keeping in the power band even under what would seem like a light load. Anything under, oh, I'd say, 800 lbs is a light load to the SWT. Heat is the killer of all things, specially plastic.

So my question would be, what exactly is wrong with the motor. Got to remember that dealerships and BRP want to not only use OEM parts, but brand new OEM parts. Often you can rebuild a motor for a lot less using used or even aftermarket parts. Or having parts (like cylinders) replated. My step son was told $4000 for his rebuild and we did the work ourselves for $1200, which included new cylinders.
 
Unless the dealership tore it down to separating the crank case and looking through the entire engine, we may never know why the gear failed.

Finding the cause of the failure is not limited to finding the failure, but rather taking all the clues into account, which can only be done by tearing it completely down.

I'll stand by what I said above, and will add that if you don't have the ability, a 3rd party shop can most likely do it for a lot less. Like less than half of that price. After all, a long block for it is only $4500. Long block just means it includes more than a "short block", it has nothing to do with physical size. Long block would require less than $100 in other stuff to make it a full repair. So a 3rd party shop could probably do this job for around $5000 max. Now, if the cylinders can be honed or even bored, and even if the crank needed to be rebuilt, you're looking at less than $3000 for the repair.

Seeing the way the gear failed tells me that something got in there and jammed it. Causing the inside of the gear to break. This is not an easy thing to do, so it was definitely something mechanical. The stripped gears as just the end result of the initial problem. So looking closely at the rest of the motor for broken pieces, in particular, anything in the crank case, including piston skirts, etc.