oil leak

Weekend Racer · 10-14-2017, 10:32 PM

Diff leaking through pinion nut thread,12 bolts chevy, Mark William Yoke ,solid sleeve, Amsoil 75W-90 synthetic .Any idea what going wrong?

Thank!

ss3011 · 10-15-2017, 01:02 AM

Many of the new nuts have a sealer pre-applied to the threads and flange .

SStockDart · 10-15-2017, 03:26 AM

Can't be leaking much, as you described. Reapply the pinion nut after loading up with silicone. Or, if you dare, jb weld

Alan Nyhus · 10-15-2017, 08:25 AM

Permatex makes an RTV specifically for gear oil. I used it to stop the weeping along the pinion splines.

https://www.permatex.com/products/ga...-gasket-maker/

Bob Mulry · 10-15-2017, 12:14 PM

I thought that everybody put PTV on the inside of the companion flange spline, so that when the flange went onto the pinion any air gaps could be taken up. The extra RTV would be pushed out and end up under the washer and make it a double seal...splines and washer..

Been doing it that way for 50 years with good results..

Just sayin'

Weekend Racer · 10-15-2017, 02:07 PM

Thank you everybody for your advices !!

10-14-2017, 10:32 PM	#1
Weekend Racer Junior Member Join Date: Feb 2003 Location: P.Q. Posts: 66 Likes: 1 Liked 1 Time in 1 Post	oil leak Diff leaking through pinion nut thread,12 bolts chevy, Mark William Yoke ,solid sleeve, Amsoil 75W-90 synthetic .Any idea what going wrong? Thank!

10-15-2017, 01:02 AM	#2
ss3011 Senior Member Join Date: Feb 2002 Location: Southeast Michigan Posts: 885 Likes: 63 Liked 221 Times in 102 Posts	Re: oil leak Many of the new nuts have a sealer pre-applied to the threads and flange .

10-15-2017, 03:26 AM	#3
SStockDart VIP Member Join Date: Dec 2007 Location: Arizona, Texan forever Posts: 1,115 Likes: 714 Liked 458 Times in 173 Posts	Re: oil leak Can't be leaking much, as you described. Reapply the pinion nut after loading up with silicone. Or, if you dare, jb weld __________________ Gary Hansen - SS/FA 4911, B/SA 4911

10-15-2017, 08:25 AM	#4
Alan Nyhus VIP Member Join Date: Dec 2002 Location: Lower Dakota territory Posts: 1,163 Likes: 1,013 Liked 761 Times in 225 Posts	Re: oil leak Permatex makes an RTV specifically for gear oil. I used it to stop the weeping along the pinion splines. https://www.permatex.com/products/ga...-gasket-maker/ __________________ "That'll never work....."

10-15-2017, 12:14 PM	#5
Bob Mulry VIP Member Join Date: Apr 2002 Location: Coarsegold, CA Posts: 1,017 Likes: 57 Liked 321 Times in 101 Posts	Re: oil leak I thought that everybody put PTV on the inside of the companion flange spline, so that when the flange went onto the pinion any air gaps could be taken up. The extra RTV would be pushed out and end up under the washer and make it a double seal...splines and washer.. Been doing it that way for 50 years with good results.. Just sayin' __________________ Bob Mulry 7516 STK A & M Motorsports

10-15-2017, 02:07 PM	#6
Weekend Racer Junior Member Join Date: Feb 2003 Location: P.Q. Posts: 66 Likes: 1 Liked 1 Time in 1 Post	Re: oil leak Thank you everybody for your advices !!