Crank disassembly and reassembly

[Gears]

Has anyone disassembled and reassembled the three piece crank?
How do you align the pieces to press it back together?


I need to replace the needle bearing on the large end of the rod. [/code]

[burnt_toast]

Whats it going in? May be easier/better to get whole new/used crank..

I would take it to a professional machine shop, heard crank itself is a big pain to disassemble

[justinnielsen01]

there is a guy on youtube called diospeeddemon he has videos that show you how

[Gears]

It's in a 86 Spree. The scooter was not used for many years and the crank was frozen ( the piston and head are in good shape). Once the engine was broken lose, it could be manualy spun, you could the hear / feel bearing ginding. There appears the water (rust) line 3/4 " up in the crank. The rod bearing along with crank bearings were under this water line.

I'll look into a machine shop? I have seen some three piece cranks on small 2 cycle marine engines so I'll ask around there too.




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[danmdevries]

A replacement crank shouldn't be much, and it'll be a new crank with new big end bearings and a new conn rod. I think I paid $120ish for mine. With all the bearings and the seals I rebuilt my bottom end for about 200 bucks. You might be better off doing that than bothering with the disassembly/reassembly of the crank. I have the press and skill to do it, but once that bearing is siezed, I don't trust the crank anymore, so personally it was worth the money for new components.

[noiseguy]

there is a guy on youtube called diospeeddemon he has videos that show you how

Can we get a link for this? Does it show how to split a crank or just how to install a new aftermarket?

[justinnielsen01]

http://youtube.com/results?search_query ... type=&aq=f
it is in a couple diffirent videos