rontice67 Posted June 27, 2008 Report Posted June 27, 2008 Anyone out there ever have a motor that passes a leak down test and as soon as it starts it sucks tranny fluid? I split the cases and replaced the seals twice still same problem Quote
Wildcardracing Posted June 27, 2008 Report Posted June 27, 2008 Anyone out there ever have a motor that passes a leak down test and as soon as it starts it sucks tranny fluid? I split the cases and replaced the seals twice still same problem First let me say welcome to the HQ. Sounds to me like you may have a bad crank, or I should say one that needs trued. Are you sure you're puting the PTO side seal in correct? The castleated side goes towards the bearing. Someone else will chime in here I'm sure with more ideas. Quote
rontice67 Posted June 27, 2008 Author Report Posted June 27, 2008 (edited) First let me say welcome to the HQ. Sounds to me like you may have a bad crank, or I should say one that needs trued. Are you sure you're puting the PTO side seal in correct? The castleated side goes towards the bearing. Someone else will chime in here I'm sure with more ideas. Hey thanks, I forgot to mention I replaced the crank with a newer one and the seal is installed correct Edited June 27, 2008 by rontice67 Quote
BigRed350x Posted June 27, 2008 Report Posted June 27, 2008 Are you putting a little bit of grease on the inside of the seal? What are you using to seal between your cases? Does your primary drive gear have any weird grooves in it or anything that would not let it seal correctly? Try putting some hi-temp gas/oil resistant silicone around the square key on your primary drive gear before you install it. I've had leaks around there before. What psi are you presurizing your bottom end to when you test it and how long are you leaving it pressurized? Quote
rontice67 Posted June 27, 2008 Author Report Posted June 27, 2008 Are you putting a little bit of grease on the inside of the seal? What are you using to seal between your cases? Does your primary drive gear have any weird grooves in it or anything that would not let it seal correctly? Try putting some hi-temp gas/oil resistant silicone around the square key on your primary drive gear before you install it. I've had leaks around there before. What psi are you presurizing your bottom end to when you test it and how long are you leaving it pressurized? The seal has grease. Don't shoot but when I went to get yamabond My local yamaha dealer only had hondabond so I talked to a couple of mechs they said use it. No wierdness with the primary gear and i didn't mich it. 6 psi for test it bleeds down to 5 after 3 min. Quote
addicted Posted June 30, 2008 Report Posted June 30, 2008 Anyone out there ever have a motor that passes a leak down test and as soon as it starts it sucks tranny fluid? I split the cases and replaced the seals twice still same problem Bump for a nice guy who is running out of ideas. Daj...any chance you have any ideas here??? Quote
J-Madd Posted June 30, 2008 Report Posted June 30, 2008 edit. I posted info on coolant leaking into case. Nevermind, it's too early Monday morning. I deleted the post. Quote
racer Posted July 1, 2008 Report Posted July 1, 2008 Split the case and seal 'er up extra fancy? Quote
rontice67 Posted July 2, 2008 Author Report Posted July 2, 2008 Split the case and seal 'er up extra fancy? Yeah I think I'll try again. i just don't get this I even spun the crank a bit during leak down test and had no change and as soon as she fires it starts sucking fluid. Thanks to all for our ideas! Quote
bunboy1 Posted July 2, 2008 Report Posted July 2, 2008 hi there, during the leak down test, it should not leak at all. i recommend you do another leak down test as you tear it down. try to find this leak. Quote
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