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oil additive to help with rear main leaks #1779716 03/14/15 03:49 PM 03/14/15 03:49 PM
Joined: Aug 2003 Posts: 8,828 Houston, Tx hemi68charger OP master
hemi68charger OP master Joined: Aug 2003 Posts: 8,828 Houston, Tx	hey gang.. I have a pesky rear main seal leak on the HEMI. It is more noticeable now that I'm putting some miles on it. is there an additive to help with the rear main seal? I don't know of the seal is robe or rubber. The motor was built when i bought it some time ago. thanks in advance.. Troy Troy Houston Mopar Connection Club '69 Charger Daytona 440 - auto - 4.10 Dana (now with 426 hemi) '69 Charger 500 440 - 4speed - 3.54 Dana '70 Road Runner 383 - 4speed - a/c (now with 440)

Re: oil additive to help with rear main leaks [Re: hemi68charger] #1779717 03/14/15 04:36 PM 03/14/15 04:36 PM
Joined: Aug 2003 Posts: 43,163 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,163 Bend,OR USA	There are no good additives known for that, don't waste your time or money on SNAKE OIL First thing to do is make sure where the oil leak is coming from, main seal, oil pan, cam plug or one of oil galley plug in the rear Let us know what you find out If it is the main seal the flex plate will have oil spraying outwards on it from the crankshaft flange out Last edited by Cab_Burge; 03/14/15 04:55 PM.

Re: oil additive to help with rear main leaks [Re: hemi68charger] #1779718 03/14/15 04:41 PM 03/14/15 04:41 PM
Joined: Nov 2007 Posts: 21,822 Kirkland, Washington Pacnorthcuda Too Many Posts
Pacnorthcuda Too Many Posts Joined: Nov 2007 Posts: 21,822 Kirkland, Washington	Replace the seal. It's not that bad of a job. Don't even have to crack the mains to lower the crank any as some suggest.

Re: oil additive to help with rear main leaks [Re: Cab_Burge] #1779719 03/14/15 04:58 PM 03/14/15 04:58 PM
Joined: Jul 2008 Posts: 30,424 Florida STAYcation dOrk ! The village idiot's idiot
dOrk ! The village idiot's idiot Joined: Jul 2008 Posts: 30,424 Florida STAYcation	x 99 on calling much of that product "snake oil"... I just went through A LOT of it(Lucas) on my leaky rack on my daily-driver hoping it would clear it up. It just got worse ... the rack is changed now ....

Re: oil additive to help with rear main leaks [Re: dOrk !] #1779720 03/14/15 06:37 PM 03/14/15 06:37 PM
Joined: Oct 2011 Posts: 515 geezer acres rest home D dakotawilly mopar
dakotawilly mopar D Joined: Oct 2011 Posts: 515 geezer acres rest home	replace it,if you are creative,it can be done in the car.not real easy but doable.they used to make a tool called a sneaky pete that pulls the 1/2 seal around the crank,but you still may need to loosen the mains to make it easier........... SFI 25.5 depends,no leak,even at 213 mph....

Re: oil additive to help with rear main leaks [Re: dakotawilly] #1779721 03/14/15 08:12 PM 03/14/15 08:12 PM
Joined: Nov 2004 Posts: 2,825 Sk. Canada RemCharger master
RemCharger master Joined: Nov 2004 Posts: 2,825 Sk. Canada	If the motor was "built" one could assume its a rubber seal,which would be easier to change. But brake clean the s**t out of it and make sure to stagger the ends. I always surface the face of the seal retainer.

Re: oil additive to help with rear main leaks [Re: RemCharger] #1779722 03/15/15 08:25 AM 03/15/15 08:25 AM
Joined: Sep 2003 Posts: 19,402 north of coder moparx "Butt Crack Bob"
moparx "Butt Crack Bob" Joined: Sep 2003 Posts: 19,402 north of coder	the new issue of mopar collectors guide [may 2014 , page 14] has a one piece rear main from "fast fish auto parts". [www.Fastfishautoparts.com] don't know much about this. may be worth looking in to ?

Re: oil additive to help with rear main leaks [Re: moparx] #1779723 03/15/15 09:05 AM 03/15/15 09:05 AM
Joined: Feb 2005 Posts: 2,709 NJ central S Scamp408 master
Scamp408 master S Joined: Feb 2005 Posts: 2,709 NJ central	I used that blue devil stuff on some non rebuildable jacks at work and going on 2 years still in service.

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