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Old 11-20-2009, 12:16 PM   #1 (permalink)
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02 700 VES engine parts....where to find??

Looking to get an 02 700 XCSP w/ 2068 miles...chassis great condition, but engine in boxes,lol. First time rebuilding snowmobile engine, will be using OEM pistons and most parts if no complete engines out there.

I'll be calling Hildabrand's tomorrow to see what they have, but right now it has an outer crankshaft bearing failure. Crank and case halves good. Toasted bearing, one piston, head and possible jug/cylinder recoating needed. I'll be checking it out on Saturday.

I'm not up to speed on when new sleeves are needed compared to just recoating...any certain depth of damage standard? Both jugs will be done if one toasted...or good set of used one.
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Old 11-20-2009, 01:37 PM   #2 (permalink)
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Since your that far into it I would highly advise having the cases machined for the wide bearing kit. make sure your crank and clutch are balanced these engines are very prone to crank bearing failure. I will check when I get home I have a good jug at the house but I am thinking its off of an 800 not a 700 my daughters boyfriend was a big polaris fan and he still has a bunch of engine parts in my garage.
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Old 11-20-2009, 01:51 PM   #3 (permalink)
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Since your that far into it I would highly advise having the cases machined for the wide bearing kit. make sure your crank and clutch are balanced these engines are very prone to crank bearing failure. I will check when I get home I have a good jug at the house but I am thinking its off of an 800 not a 700 my daughters boyfriend was a big polaris fan and he still has a bunch of engine parts in my garage.
Jerry, thanks for the info. I do not own this sled, going to look at chassis and engine parts tomorrow. Just getting all my prices lined up to show current owner how much getting the sled going would be so we can work on a rolling chassis price.

I thought only the 800's had the crank issue. The 02' 700's are more prone to meltdown due to the airbox and main jet designs....no?
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Old 11-20-2009, 02:07 PM   #4 (permalink)
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Yea it was more common in the 800's and even more so in the long track sleds but its still an issue in the 700's too and since this engine has already had the failure it will more than likely happen again if you dont take every precaution. My daughters boyfriend had both a 700 and an 800 and had crank bearing failures in both and both had less than 3000 miles on them when it happened. Thus the reason I have a bunch of engine parts in my garage lol.
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Old 11-20-2009, 02:32 PM   #5 (permalink)
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Yea it was more common in the 800's and even more so in the long track sleds but its still an issue in the 700's too and since this engine has already had the failure it will more than likely happen again if you dont take every precaution. My daughters boyfriend had both a 700 and an 800 and had crank bearing failures in both and both had less than 3000 miles on them when it happened. Thus the reason I have a bunch of engine parts in my garage lol.
Great info Jerry, and much appreciated.

This sled has 2068 miles and that's exactly what brought it down on the past owner. The outside bearing lost one of the ball bearings and hence the engine in boxes.

Please explain wide bearings compared to OEM...this is first time rebuilding if I chose, so don't know the ins/outs. I'm an engineer, so I will understand however you can say it, hopefully,lol!

Thanks!
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Old 11-20-2009, 02:46 PM   #6 (permalink)
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Well I am by no means a Polaris expert just know what he went through and helped him with his engines. He found the bearing kits on ebay once we had them then a local machine shop did the case work for us. I beleive some of the kits he found had an option to send your cases in and they would machine them and break your crank down and put the new bearings on.

there is another member (Bcdan) here that would probably be of a lot more help so give this thread a little time and I am sure he could give you more info and places for parts availability.
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Old 11-20-2009, 07:56 PM   #7 (permalink)
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There are several places that offer a wide bearing update for the crank. AllSports in Washington state, Starting Line Products in Idaho, and Indy Specialty are three places that have done a lot of these. Indy Specialty builds probably the strongest bottom end for the large block 700/800 and offers a 5 year warranty on their work.

It's thought that the cases in the 700/800 are the weak link. I have seen a few cross-sections and they are very porous. The theory is that a wider bearing on the PTO end will spread the force out across a greater bearing surface, giving longer life to the crank. As the torque from the engine pounds on the bearing surfaces through the crank bearings, the crankcase gets to be out of spec and clearances and offset go way beyond spec. Many times, the crank fails because the case can't hold it, not because it's a bad crank.

The theory behind the wider bearing is that a wider bearing surface will spread the load across a greater area in the crankcase, resulting in longer life. Some fixes require machining to receive the bigger bearing, others are a simple swap of OEM bearings for the wider one. If your crank is out of spec, the case halves can be machined and then the case line-bored. For some of the guys that run big HP 800's, if they do that, they also put in a new crank. For a stock 700, your crank may be usable after repair.

After you get the engine back together, to keep it from happening again, balancing the clutch is the most important preventative thing you can do. Adding an engine plate to the bottom of the engine will keep the crank straight and has seemed to help. Adding a push stop on the MAG side and a torque link on the PTO side are also things that are done to keep the engine from flexing.

New cranks are about 950 bucks, cases are about 550. Machining and line-boring will be about half the cost of a new crankcase. It's hard to say how much you will be into it when done until the machinist looks at it. You want someone working on it that has done a LOT of 'em, the 3 listed have a LOT of experience.

Or find a used engine and run it until it drops! Some of 'em go 8000 miles plus with NO issues.

Good luck, those 700's have a LOT of power, and around here, are more sought after by the guys putting turbo power to mod sleds than the 800's. They do share the same crankcase/crank design as the 800, but have a reputation of holding up MUCH longer than the 800.
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Old 11-20-2009, 08:32 PM   #8 (permalink)
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Quote:
Originally Posted by 5Cent View Post
Looking to get an 02 700 XCSP w/ 2068 miles...chassis great condition, but engine in boxes,lol. First time rebuilding snowmobile engine, will be using OEM pistons and most parts if no complete engines out there.

I'll be calling Hildabrand's tomorrow to see what they have, but right now it has an outer crankshaft bearing failure. Crank and case halves good. Toasted bearing, one piston, head and possible jug/cylinder recoating needed. I'll be checking it out on Saturday.

I'm not up to speed on when new sleeves are needed compared to just recoating...any certain depth of damage standard? Both jugs will be done if one toasted...or good set of used one.
I can completely rebuild your 700 engine, crank, wide bearing, etc. Crank true and weld, cylinder work, pistons, seals, gaskets. I have all parts in stock, over 30 years experience and know what works on the Polaris domestic twins. I am in Michigan and ship FedEx daily. Call me Saturday at 810-687-4355 to discuss your best course of action.
Jerry
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Old 11-23-2009, 10:23 AM   #9 (permalink)
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Guys, great information and much appreciated!!

I had a chance to look at the chassis and engine pieces on Saturday and definitely like what I saw. The PO caught the bearing failure early, so minimal damage to most parts.

If we can agree on a price for the chassis, then I will be getting in touch with all those that have posted.

Thanks again!
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