7.3 Rear Main Is Leaking - PowerStrokeNation : Ford Powerstroke Diesel Forum
LinkBack Thread Tools Display Modes
post #1 of 6 (permalink) Old 05-15-2011, 12:09 AM Thread Starter
PSN Newb
Join Date: May 2011
Posts: 2
7.3 Rear Main Is Leaking

Hello to all. Hope someone can help me out. I have a 1999 F-350 7.3 with 258,000 thousand miles. Has been a great truck. This winter I had the oil pan replaced along with a new transmission. Of course with replacing the oil pan the rear main was replaced also. About a week after the work was done the rear main started to leak. I took it back to where I had the work done and they took care of it. I have kept a close eye on it since January. Nothing appeared to be leaking. Today I went to change the oil and I looked at it and noticed it looked alittle wet. I pulled off the inspection cover on the bell housing and looked up and around where the seal goes into the oil pan and saw a small drop of oil on the rvt sealer around the seal. It did not look that bad. Then I looked up into the housing and noticed some oil up around the top of the housing. I am hoping that was oil that was not cleaned up from before. I guess my question is can it be leaking on the front side of the fly wheel where it bolts to the crank where you can not see it. What I am trying to find out is if the oil is coming from the front. Again because the drop on the rvt sealer by the oil pan was just a drop and I do not think it could have had made the oil around the top of the housing. When it leaked it leaked pretty good hoping that is old oil. Hoping someone may know somthing or if it is leaking again what might be causing it. Thank you
sideboom583 is offline  
Sponsored Links
post #2 of 6 (permalink) Old 05-15-2011, 12:20 AM
PSN Veteran
Join Date: Nov 2007
Location: No man's land
Posts: 15,554
Re: 7.3 Rear Main Is Leaking

Are you 100% positive it's the rear main leaking? Make sure you have no oil leak's or fuel leak's in the valley of the engine.

02 f250
countryboyrob is offline  
post #3 of 6 (permalink) Old 05-15-2011, 12:44 AM Thread Starter
PSN Newb
Join Date: May 2011
Posts: 2
Re: 7.3 Rear Main Is Leaking

Hello Countryboyrob, I checked all that. It is the seal.
sideboom583 is offline  
post #4 of 6 (permalink) Old 05-15-2011, 01:28 AM
OBS junkie
Cat_Rebel's Avatar
Join Date: Jul 2007
Location: In or under a truck
Posts: 8,250
Re: 7.3 Rear Main Is Leaking

9 out of 10 times a "rear main" leak is a "turbo/pedistal" leak. However in your case if it was replaced & installed incorrectly then it sounds like you do have a rear main issue. I'd take it up with the shop that did the work & see if they have some kind of warranty since they did the labor.

97 F350 CCLB "Da Bus"

RIP Will Iott
"This ain't no practice run"

Originally Posted by countryboyrob View Post
And remember, he's cat rebel....he doesn't do it the normal way.
Cat_Rebel is offline  
post #5 of 6 (permalink) Old 05-16-2011, 02:54 PM
All done now
Arisley's Avatar
Join Date: Sep 2007
Location: Arlington, TX
Posts: 22,486
Re: 7.3 Rear Main Is Leaking

Nice avatar Cat.

Early '99 F350 DRW, Excab, LB. Auto. 2WD, 2010 bed, 2005 headlights, 298K, on my way to 1000K.
H2E, 238 Hybrids, Adrenaline oil, Tuned by Tony. DIY Regulated Return.
Arisley is offline  
post #6 of 6 (permalink) Old 05-16-2011, 03:13 PM
"Smoke A Lil Smoke"
chappy's Avatar
Join Date: Aug 2008
Location: Marshall Mi
Posts: 2,054
Re: 7.3 Rear Main Is Leaking

Yep as said it usually is comming from the top. It is a deep valley on top of the motor and anything leaking poil on top will drop down into the valley and come down the back passenger side of the motor. It will look like its the rear main when usually its not. It could be a hpop line leaking at the fitting on one of the heads,the turbo pedestal leaking ect. It will all come down the back of the motor and look like its commin from the rear main. Climb up there and look in the valley and see if you see oil. It will be harde to see around the base of the turbo pedestal though. Might have to look from bottom and top on a sunny day.

2004 f250 egr delete,studded,fass 95,suncoast convertor,itp RR,Banks intercooler,58v tuned ficm,Powermax turbo,Matts tunes,6in Icon and 35 toyos 20x12 fuels
Early 99 exlb 4wd-SOLD All Shaeffer oil
Will Iott -8/24/84-7/4/10 "We miss you buddy"
chappy is offline  
Gear in this thread - Powered by O'Reilly Auto Parts

Quick Reply

Register Now

In order to be able to post messages on the PowerStrokeNation : Ford Powerstroke Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome