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Question:

how long does crankshaft bearings take to replace on snowmobile?

nan

Answer:

Quite a while. 4 hours+ The engine case has to be split apart.
could be months
After splitting the engine case the crankshaft must be pressed apart in sections to remove the roller main bearings and needle bearings on the big ends of the rods. This is not a job for an inexperienced person with the wrong tools. All the sections of the crank must be indexed properly in a fixture before they're pressed back together. Nowadays a *new high performance snowmobile crankshaft including the bearings and rods cost more than a crankshaft for your car!

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