670 Seals

[DBformSS]

My machine won't settle it's idel it's running around 3000 rpm so I'm guessing that my pto seal is gone can anyone tell me if you can change the seals with out splitting the casings and how to do it.

[midwest]

My machine won't settle it's idel it's running around 3000 rpm so I'm guessing that my pto seal is gone can anyone tell me if you can change the seals with out splitting the casings and how to do it.[/b]

not shure about 670 but i asked same ? on a cuyuna440 i was told to slip on and i asked the peformance center that did my mxz and he said slip it on with out splitting case, your case is sealed if you split you broke seal.let me know how you get it in cause i bent the first one, need right tool, Crash Dummy

[Thumbdoctor]

According to Rotax it shouldn't be removed and pressed in. The correct way is to split the cases. Now for some reality..The best way to remove the old seal in place is to punch a 1/8 hole in it (Not drill as that risks getting metal in the PTO bearing). Now thread a #8 self tapping screw into the hole but only in 1/4" (so you don't touch the bearing). Grab the screw head with some Vise Grips and pull the old seal out. Buy yourself a new OEM Rotax PTO seal. Clean the seal bore on the crankcase with a rag soaked with brake cleaner (don't spray directly into seal bore or you will compromise the case sealant) and deburr the outside circumference of the seal bore. Warm up the new seal and apply some Lithium grease to the seal lip and a good coating of Loctite 515 gasket eliminator to the outside of the seal (High temp RTV silicone sealer will do in a pinch). Using a piece of 2" diameter X 6" PCV plastic plumbing pipe, press the new seal onto a slightly greased crankshaft (using a little lithium grease) and make it flush to the case. Allow the sealant to dry for a couple of hours before using the sled. You may see a small amount of seal material peel of the new seal as it is being installed... don't worry this is normal for this type of installation. If you are not 100% comfortable with the seal staying put you can order 3 screws / washers from a 550 fan motor(2006 I believe) and drill and tap the side of the case.
[attachment=33051:seal_retainer.JPG]

[oldyeller]

Great how to by thumbdoctor but are you sure your seal is gone?..Try spraying some wd-40 around the seal with the engine running and see if the engine revs up?..If not it there may be another reason for your high idle (frayed throttle cable etc).