Rebuilding my engine on a 1994 Polaris 600 - Snowmobile Forum: Your #1 Snowmobile Forum

Crazy k · 10-30-2009, 08:47 PM

So I'd really like to rebuild my engine myself but a friend of mine said the crank is press fit into place. I don't know how complex it is to do,or how it is balanced but I'm wondering if someone has a device or homemade unit they built to do the job themselves. Thanks muchly

stangcruzin · 10-30-2009, 08:53 PM

What's wrong with it?Why does it need a rebuild?If the top end needs a rebuild that's not difficult.But if the crank is no good,just replace it with one that is already re-manufactured.Crank rebuilding is not for the average joe,unless you have a machine shop in your back yard.

Mrdman2442 · 10-30-2009, 10:21 PM

If its low in compression a top-end rebuild will restore power and can easily be done with a little common sense. If there are lower end, crank issues, or bearing problems you will need some engine tools and a little more expertise.

Crazy k · 10-31-2009, 10:24 AM

The guy I bought it off said it was the Crank bearings,the head is removed and looks in good condition and the pistons look clean on the tops.From what I've heard so far the pistons are not bolted on to the crank but pressed in place.I've got acess to a good press and am very mechanicaly inclined and have more tools than some of the mechanics I know It's the balancing part that I don't know about mybe it is best to leave it to a pro. One of the other members gave me the number for northern crank I'll see what it will cost me to rebuild.so far I've rebuilt a 350 and a 454 both turned out fantastic. The big block is in my 1980 vette it's got an ls6 block steel crank the block is bored 60 over it's got a viper cam the heads are shaved ported and pollished 7/16 push rods with roller rockers and a high rise side winder battle ship With the 750 double pumper this is one mean engine! Connected to a Richmond six speed the car has had a full body off restoration that's about 90% complete and I did it all myself even putting the body back on the frame. I got lots of help from the boyz on the corvette forum and it was supposed to be my winter project to finish but with these sleds the project is lookin a little bleek.

**BC_Dan** · 10-31-2009, 11:40 AM

Snowmobiles use caged ball bearings on the crank. The crank is several pieces pressed together instead of a one-piece assembly like a car. Removing the pieces to replace a bearing is a task for someone that has the tools and knows what they are doing. Most good shops should be able to help you, some have better reputations than others. I would consider a specialty shop over a general mechanic, as they have more experience and expertise.

The pistons are fit to the connecting rod with a wrist pin and roller bearing. The lower connecting rod is also a roller bearing on a pin, in Polaris sleds, it's usually a caged bearing on both ends.

Find your sled here and take a look at the crankshaft, you will see how they are made. Normally, crank parts are not available as individual parts, but you can buy whole cranks new. A specialty shop will have the parts you need to get your engine back to running condition.

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