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Old 07-16-2012, 12:56 PM
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Default Splitting case and replacing crank assembly

     

How involved is it to actually split the case and replace the crank assembly. I have the engine out and the clutch basket out. Is it as simple as pulling the case halves apart and installing the new crank assy, bearings and seals, checking tolerances and bolting it back together??? Judging from the looks of it, it appears it will require removing all the transmission linkage and all in this picture in order to separate the case? If it requires significant dismantling of the transmission I'm going to bring it to a local shop and have them do the work but at $90/hour I'd like to save some money and do it myself as I am fairly competent mechanically. I have the yamaha service manual but its actually pretty vague in its ability to describe the removing and installing procedures.

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Old 07-16-2012, 01:15 PM
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Ok, if you have the manual it should not be to bad for a first time do. You will need a flywheel puller and a case spliter to do the job correctly. It is possible to do this job with out removing all the trans parts, but to do a first class job , clean and inspect all bearings etc. it really needs to taken out too.
You will need to heat the cases and freeze the crank bearings to get them in the case so having all out is better.

Your call.

Paw Paw
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Old 07-16-2012, 01:15 PM
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Its quite easy but you need a case splitter and a flywheel puller.
You can freeze the new bearings and heat the cases they should drop in. As for the gears lst time I did not even take those out. I built myself a press and that did it.
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Old 07-16-2012, 01:24 PM
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Ok, there are some great videos available for you to watch on you tube supplied by Rocky Mountain MC. Look up crank replacement and you can watch to see if this is something you think you can do.

Paw Paw
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Old 07-16-2012, 01:33 PM
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Thanks guys. I'll check out those vids. Didn't even think of that.
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Old 07-16-2012, 02:09 PM
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You have another post and I said on that one:

You don't need a case splitter for Suzuki engines. It won't hurt if you do use one but it is not necessary. The main reason that you would need one, is to press the crank out of the case. I used a homemade press out of some bolts at the hardware store and a harmonic balancer puller (cheap).
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Old 07-16-2012, 03:08 PM
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Quote:
Originally Posted by Randog Leader View Post
The main reason that you would need one, is to press the crank out of the case.

Right on the spot
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Old 07-17-2012, 06:52 AM
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Thanks guys. This is a Yamaha YZ engine. The RM videos make it look awfully easy with the Tusk crank and crankcase tools but I'm guessing a regular puller set that I have like this one would work fine for doing the job??? I'll be saving a couple hundred dollars by doing the work myself so it may be worth it to invest in the tusk tools. Other than that it looks pretty easy so I'm probably gonna just do the work myself.
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Old 07-17-2012, 06:55 AM
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I think you will find that the puller set you have will work on some items, but the case splitter tools of Tusk are the way to go.

Paw Paw
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Old 07-17-2012, 01:56 PM
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That will work but you may need to get some bolts from the hardware store. That set is probably standard and won't have the metric bolts that you need. I think that it is M8 that you will need. Hardware store, cheap.
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