Rear main seal leaking after sitting for a couple days

gabe3586

New Member

Aug 22, 2005

40

0

0

Mar 18, 2008

#1

• Mar 18, 2008

• #1

Well I have about 2000 miles on my new motor and everything is going good so far. I left town for about 4 days last weekend and came back to see that my rear main is leaking about 2 drops a day. I havent driven it since because I am real busy this week. I was wondering if it was because it was sitting so long? Im just concerned because im still running regular 10w30 oil and am planning on switching to synthetic the next oil change and know it will probaly leak more with the synthetic.

 

Redfire 05

New Member

Apr 6, 2005

236

0

0

Lubbock, TX

Mar 19, 2008

#2

• Mar 19, 2008

• #2

My rear main seal started leaking almost immediately on my newly rebuilt engine. I've been told it is a common problem with the 5.0 motors. But maybe I'm wrong.

 

fiveoho

15 Year Member

Apr 28, 2005

1,958

16

69

TN

Mar 19, 2008

#3

• Mar 19, 2008

• #3

when i replaced my trans i put in a new seal. that was about a year and a half ago. its leaking already

 

90lxvert13

Member

Aug 4, 2007

33

0

7

Bristol, CT

Mar 19, 2008

#4

• Mar 19, 2008

• #4

ive heard multiple reasons for this, either its from age, typical for the motor, problem with the pcv or the crank case isnt vented properly. if its a fresh rebuild check/replave the pcv or add a crank case breather. crank case pressure can build up if the pcv is clogged or if the crank case isnt vented properly, causing the leak. also if its a bigger cube motor (331/347) it may need a breather tank.

 

skunk21

Active Member

May 22, 2007

1,203

3

36

Taxachusetts

Mar 19, 2008

#5

• Mar 19, 2008

• #5

fiveoho said:

when i replaced my trans i put in a new seal. that was about a year and a half ago. its leaking already

Click to expand...

+1 and i used a ford seal and followed all the advise on here on the install and mine leaks, although not has bad very minor but still .

 

J

Jack's95gt

Member

Aug 15, 2004

443

1

18

Huntingdon Valley, PA

Mar 19, 2008

#6

• Mar 19, 2008

• #6

The poor rear seal gets blamed many other of leaks. Valve cover leaks. Upper to lower rear intake leaks, oil pan leaks are sometimes responsible.

 

Fett

New Member

Nov 2, 2004

766

6

0

Mar 19, 2008

#7

• Mar 19, 2008

• #7

I have also heard that a slightly off balancer can cause premature seal leaks.

 

strtrcr50

New Member

Jun 21, 2006

0

4

0

Previously from Dirty Jerzey exit 7a

Mar 20, 2008

#8

• Mar 20, 2008

• #8

Sounds normal to me.

 

O

oneofakindfxbdy

New Member

Sep 22, 2008

21

0

0

Sep 22, 2008

#9

• Sep 22, 2008

• #9

im with the one guy i would check for something else leakin just to be sure... ive worked on cars for a while and stopped more rear main seal leaks by putting new intake gaskets on than rear mains.... is there any oil anywhere else on the car?