a couple of question on my 900 rmk crank

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happyfast79

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Nov 26, 2007

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gillette, WY

• Sep 23, 2008

• #1

its a 05 900 rmk im in the process of putting compfusions mounts in and 06 pistons well when i was changing the pistons i noticed a few spots on the rods where they were darker/ purplish color. and it was at the dealer last summer getting the updates done and they found that the pto crank seal was pushed in from a blown belt, so they opened up the engine and found that one of the crank bearings looked like it ran lean on oil so they sent it off the slp to have them re bearing the crank. do you guys/gals think this is from before they redid the crank or is this something i need to worry about.

 

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big_wally81

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Jan 22, 2008

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duluth minnesota

• Sep 23, 2008

• #2

can't see your pics but usually a darker purplish color means it got hot, it could have happened when you ran lean.

 

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happyfast79

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gillette, WY

• Sep 24, 2008

• #3

ttt anybody have any other insite? the upper rod bearing bores are not pitted and have no discoloration even where the out side of the rod is a little discolored

 

indydan

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• Sep 24, 2008

• #4

900 rods

You cannot buy just rod bearings.

rod kits are $257.00 each

and mains are about $28.00 X 6

so you have Rod kits $515.00 + Main bearings $168.00

parts $683.00 labor $200.00 minimum = $983.00


New crank is about $992.00 most dealers will give you a little break off retail.

I have new rod bearings only if you need them, chances are the rod & pin are bad ( the rod pin is built into the inner web. )

Dan

 

mountainhorse

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• Sep 24, 2008

• #5

IMO... you should also check the fit of the bearing in the case...

The new cranks have the stronger 33 mm pto end...

These engines require a bit of clearance checking and possibly a line-bore if the case is not good...

IMO... send it in to Dan for a full check up and blueprint...

 

mountainhorse

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• Sep 24, 2008

• #6

Dan,

Are the big and pin ends of the rods induction hardened and discolored from that?

 

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happyfast79

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• Sep 24, 2008

• #7

so you guys dont think this is from the previous failure?

 

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dmj1

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Jul 31, 2007

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• Sep 24, 2008

• #8

i would say the con rod ends got very hot .you probably lost the temper out of the bearings now and i am surprised you did not throw a rod. ie piston starts to hit the head.
i doubt slp would fix a crank and leave these rods in looking like that.
i suspect you ran lean on oil again . I had over 5500 kms on my crank and they had not discoloration at all.Good oil ,Good warm up and i always and a little oil to the fuel.

 

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happyfast79

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• Sep 24, 2008

• #9

just a question but wouldnt the bearings show sighns of heat before the rod does?
the wrist pin bearing that is in the discolored rod looks fine.

 

indydan

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• Sep 24, 2008

• #10

Pin color

happyfast79 said:

just a question but wouldnt the bearings show sighns of heat before the rod does?
The wrist pin bearing that is in the discolored rod looks fine.

Click to expand...

the rod pins are colored from polaris & they are a brown color when there new.

The wrist pin bearing only rocks back and forth and very slow speed, where as the lower rod bearing is haul a$$ that far from center.

The rod colored up from alittle extra heat when it went lean, and the oil turned it that color.

Chances are if it has the exact same feel side to side that the other rod has its ok.

But remember............... You have to make the final call. IF IT FEELS LOOSER ITS JUNK.

Dan

 

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happyfast79

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• Sep 25, 2008

• #11

thanks for all your input looks like im gona put a dial indicator on the rods and see how much slop they have compared to each other if there really close im gona run it, so hopefully they are good because in buying a house and cant afford a new crank. so that will wreck my season.