any trick to 5.0 rear main seal?

S

Stangler

A.K.A. Mr. Hankey

Founding Member

Dec 20, 2001

1,357

1

37

Dec 27, 2004

#1

• Dec 27, 2004

• #1

When I did the C-4 swap, I changed the rear main seal. It leaked bad after!!! WTF!!! pulled it out (tranny) and found that it wasen't seated all the way, so I pushed it all the way in. Went for a drive,... and it leaks!!! WTFWTF!!! When I put it in, I lubed the inside and slipped it over the crank. Does it need RTV on the outside edge? anybody with ideas, I'm pulling the tranny again for the last time and want to fix it for good.

Nate

 

tmoss

Gettin Wired

Founding Member

Jun 28, 2001

7,153

32

128

Saint Louis, MO

Dec 27, 2004

#2

• Dec 27, 2004

• #2

Yes, use some rtv to seal the metal outer ring on the main seal.

 

M

Matts89LX5.0

Founding Member

Nov 1, 2002

1,314

0

36

Long Island, NY

Dec 27, 2004

#3

• Dec 27, 2004

• #3

good, eventually i was gonna ask the same question

 

M

MusPuppis

New Member

Nov 8, 2004

136

0

0

Lexington, Ky.

Dec 27, 2004

#4

• Dec 27, 2004

• #4

would the RTV trick work for the trannys main front seal? I replaced it last time I pulled the tranny out but its steadily dripped every since.

 

S

Stalkerfiveo

New Member

Dec 27, 2004

16

0

0

Conyers, GA

Dec 27, 2004

#5

• Dec 27, 2004

• #5

it seems as if once the stock seal goes bad youll bnever get one to last very long again.sad but true

 

tmoss

Gettin Wired

Founding Member

Jun 28, 2001

7,153

32

128

Saint Louis, MO

Dec 27, 2004

#6

• Dec 27, 2004

• #6

MusPuppis said:

would the RTV trick work for the trannys main front seal? I replaced it last time I pulled the tranny out but its steadily dripped every since.

Click to expand...

Yes it would.

 

GT Trooper

Member

Feb 16, 2004

87

0

7

Redford

Dec 27, 2004

#7

• Dec 27, 2004

• #7

Good luck, I replaced mine twice and it still leaks.

 

SWYZ721

Member

Aug 24, 2004

208

0

16

Ann Arbor, MI

Dec 27, 2004

#8

• Dec 27, 2004

• #8

This was my concern when I was purchasing my stang, I was very worried until I spoke to one of my good buddy's friend, who told me in one season he dropped the trans 5 times and every time it seeped, he threw in every different seal teflon and what not, he said from his experience they all leak to some degree and it's mostly harmless. Just like the beatiful eaxhaust note, it's a 5.0 thing.

 

tmoss

Gettin Wired

Founding Member

Jun 28, 2001

7,153

32

128

Saint Louis, MO

Dec 27, 2004

#9

• Dec 27, 2004

• #9

Could be an indication of main bearing wear too. Movement will wear the seal out early and cause it to leak from day one it it's not running true. Consider that if your a high mileage car.

 

S

Stangler

A.K.A. Mr. Hankey

Founding Member

Dec 20, 2001

1,357

1

37

Dec 27, 2004

#10

• Dec 27, 2004

• #10

It leaks enough to get oil thrown onto the exhaust by the flex plate, and that is what bugs me. Car sits at a light and you can see alittle smoke coming from under it. I'll be pulling it soon, and I'll try the RTV trick and let you guys know. I'm getting sick of pulling the tranny, but not much else going on

Nate

 

Stang8URMPRT

Active Member

Dec 28, 2003

1,100

1

38

Daytona Beach, FL

Dec 27, 2004

#11

• Dec 27, 2004

• #11

I've changed my rear main 3 times in about 5000 miles... All felpro seals... Every time I've done it, I used RTV... but it still leaked... Yet, that wasn't what was leaking. For those that don't know, your flywheel/flexplate to crank bolts can leak. The tapped holes in the back of the crank actually go all the way through, and if you do not use RTV or some type of thread sealer, you will get oil getting through the threads, making it look like a rear main. My two cents... And mine doesn't leak anymore.

Nick

 

tmoss

Gettin Wired

Founding Member

Jun 28, 2001

7,153

32

128

Saint Louis, MO

Dec 27, 2004

#12

• Dec 27, 2004

• #12

Yep, threads have to be sealed too.

 

S

Stangler

A.K.A. Mr. Hankey

Founding Member

Dec 20, 2001

1,357

1

37

Dec 27, 2004

#13

• Dec 27, 2004

• #13

tmoss said:

Yep, threads have to be sealed too.

Click to expand...

I used red loctite, on the flexplate bolts. should I use RTV?

 

tmoss

Gettin Wired

Founding Member

Jun 28, 2001

7,153

32

128

Saint Louis, MO

Dec 27, 2004

#14

• Dec 27, 2004

• #14

Red loctite (permanent) will make getting the bolts out a bear, but it will seal the threads. Next time I'd use the blue loctite - kmeant to be disassembled but still hold well.

 

S

Stangler

A.K.A. Mr. Hankey

Founding Member

Dec 20, 2001

1,357

1

37

Dec 27, 2004

#15

• Dec 27, 2004

• #15

tmoss said:

Red loctite (permanent) will make getting the bolts out a bear, but it will seal the threads. Next time I'd use the blue loctite - kmeant to be disassembled but still hold well.

Click to expand...

K.... maybe I did use blue? It's red in color, but in a blue tube!? (Not looking at the product at this moment, but remember the tube)

 

tmoss

Gettin Wired

Founding Member

Jun 28, 2001

7,153

32

128

Saint Louis, MO

Dec 27, 2004

#16

• Dec 27, 2004

• #16

Color of the fluid is waht counts - red is permanent and blue is meant for dissassembly.

 

R

ratrapp

New Member

Apr 24, 2004

510

0

0

buena vista,va

Dec 28, 2004

#17

• Dec 28, 2004

• #17

also if the motor has alot of blowby it will push the seal out.thats what my motor does.

 

tmoss

Gettin Wired

Founding Member

Jun 28, 2001

7,153

32

128

Saint Louis, MO

Dec 28, 2004

#18

• Dec 28, 2004

• #18

blowby should be taken care of by the PCV system - be sure the PCV valve is new(er) and the filter screen below the PCV valve is not plugged up with gunk which is a very common thing. Don't try to clean one, they get deposits that most solvents won't touch - buy a new one for a few bucks.

 

GT Trooper

Member

Feb 16, 2004

87

0

7

Redford

Dec 28, 2004

#19

• Dec 28, 2004

• #19

Stang8URMPRT said:

I've changed my rear main 3 times in about 5000 miles... All felpro seals... Every time I've done it, I used RTV... but it still leaked... Yet, that wasn't what was leaking. For those that don't know, your flywheel/flexplate to crank bolts can leak. The tapped holes in the back of the crank actually go all the way through, and if you do not use RTV or some type of thread sealer, you will get oil getting through the threads, making it look like a rear main. My two cents... And mine doesn't leak anymore.

Nick

Click to expand...

I sure wish someone had told me this. Both times I failed to use a sealer on those bolts. I have no desire to go through this again but what the hell, it's winter time.

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

34

129

Dec 28, 2004

#20

• Dec 28, 2004

• #20

so do you all recommend using a silicone type product (copper RTV, etc) or blue threadlock on the flywheel bolts? i usually use some threadlock, but would use RTV if the threadlock might not seal well enough and 'backing out' is not much of an issue.
TIA.