Welcome to Club Hot Rod!  The premier site for everything to do with Hot Rod, Customs, Low Riders, Rat Rods, and more. 

  •  » Members from all over the US and the world!
  •  » Help from all over the world for your questions
  •  » Build logs for you and all members
  •  » Blogs
  •  » Image Gallery
  •  » Many thousands of members and hundreds of thousands of posts! 

YES! I want to register an account for free right now!  p.s.: For registered members this ad will NOT show

 

Thread: rear seal leaking need help
          
   
   

Reply To Thread
Results 1 to 9 of 9
  1. #1
    4onthefloor is offline CHR Member Visit my Photo Gallery
    Join Date
    Oct 2004
    Location
    Bracebridge
    Car Year, Make, Model: 68 Chevelle
    Posts
    8

    Unhappy rear seal leaking need help

     



    hi i have a 1974 350 with rear seal leak Ive replaced and it still leaks i even off set the seal and its still leaking is there a better seal i could use for a stubborn leak like this. cam plug and oil gally plugs are not leaking and rear seal only leaks when motor is running should i use an offset seal or a double lip seal this motor only has 6 hours on it. and has anyone used these seals if so do you have any part # thanks for the help

  2. #2
    lt1s10's Avatar
    lt1s10 is offline CHR Member Visit my Photo Gallery
    Join Date
    Aug 2004
    Location
    rustburg,
    Car Year, Make, Model: 1997 CHEVY.S10 LT1-350
    Posts
    4,093

    Re: rear seal leaking need help

     



    Originally posted by 4onthefloor
    hi i have a 1974 350 with rear seal leak Ive replaced and it still leaks i even off set the seal and its still leaking is there a better seal i could use for a stubborn leak like this. cam plug and oil gally plugs are not leaking and rear seal only leaks when motor is running should i use an offset seal or a double lip seal this motor only has 6 hours on it. and has anyone used these seals if so do you have any part # thanks for the help
    sounds like youve got some other problem. if you have the seal in there right it wouldnt leak. make sure its not in backwards, thats not hard to do. if you know its in there the right way and the seal is ok you need to look some where else. make sure the motor is breathing like it should. oil can run down from the back of the intake or valve cover gaskets and fool you sometimes. the oil pressure switch will leak on chev. sometimes to and run down the back of the motor so it looks like the seal.
    Mike
    check my home page out!!!
    http://hometown.aol.com/kanhandco2/index.html




  3. #3
    onemangang's Avatar
    onemangang is offline CHR Member Visit my Photo Gallery
    Join Date
    May 2004
    Location
    I.G.H.
    Car Year, Make, Model: SBC 400 pwrd 10th Anniversary Trans Am
    Posts
    137

    I had the same problem as you but on my 400 chev. It turned out to be the rear main seal too. The only problem with it was the engine builder put in the wrong seal-it should have been a align hone rear main seal. Was your Chev 350 align honed? maybe that's it. This seal is just a little bigger. part #720-1962 from Jegs
    I also thought it was the rear of my oil pan because it was chrome so I got the one piece fel pro "rubber like gasket" it's reusable and guarateed not to leak. Rear main seal leaks suck. I pulled my engine twice because of it. I now know that you don't have to do that. I just removed my motor mount bolts and jacked up the engine so I had just enough room to remove the oil pan. Sure beats pulling it out completley. hope this helps.
    Gas Grass Or Ass-Nobody rides for free!!!

  4. #4
    4onthefloor is offline CHR Member Visit my Photo Gallery
    Join Date
    Oct 2004
    Location
    Bracebridge
    Car Year, Make, Model: 68 Chevelle
    Posts
    8

    do you have a part # Streets . thanks for the help guys

  5. #5
    Electric Cowboy's Avatar
    Electric Cowboy is offline CHR Member Visit my Photo Gallery
    Join Date
    Dec 2004
    Location
    Topeka
    Car Year, Make, Model: 1978 Chevy Monte Carlo
    Posts
    6

    I just put a 350 in my 78 Chevy monte Carlo and thought the the rear main was leaking as well, but when i went yesterday to get new exhaust from the headers back they noticed that i was coming from the oil sensor on the back of the intake. That was what caused my leak . . .the oil was hitting the firewall and running down the side of the transmission (giving the apperance of a rear main seal leak) It's a quick fix, $ 7.00 at the local Advance Auto Parts Store. That's just my suggestion . . Good Luck.

  6. #6
    dr_bowtie's Avatar
    dr_bowtie is offline CHR Member Visit my Photo Gallery
    Join Date
    Jan 2005
    Location
    Elkhart
    Car Year, Make, Model: 1957 chevy Belair
    Posts
    316

    here what I do....when putting a rear main seal rotate the seal so the parting lines are actually inside the cap/block surface....I push it in till a 1/2 inch hangs past and put a very tiny dab of adhesive sealant on the ends.....lip must be facing front of engine......works everytime.....

  7. #7
    faster340 is offline Registered User Visit my Photo Gallery
    Join Date
    Mar 2005
    Location
    Maspeth
    Car Year, Make, Model: 1979 Chevrolet Monte Carlo
    Posts
    1

    Re: rear seal leaking need help

     



    Originally posted by 4onthefloor
    hi i have a 1974 350 with rear seal leak Ive replaced and it still leaks i even off set the seal and its still leaking is there a better seal i could use for a stubborn leak like this. cam plug and oil gally plugs are not leaking and rear seal only leaks when motor is running should i use an offset seal or a double lip seal this motor only has 6 hours on it. and has anyone used these seals if so do you have any part # thanks for the help

    Did you happen to fix this problem? I am having similiar problems but it's not the oil sending unit.

    Please advise.

    Thanks.
    Russell M.
    http://users.myexcel.com/faster340

  8. #8
    LongT's Avatar
    LongT is offline CHR Member Visit my Photo Gallery
    Join Date
    Nov 2005
    Location
    Allentown
    Car Year, Make, Model: 23 T Bucket
    Posts
    4

    Rear Main Seal

     



    Quote Originally Posted by onemangang
    I had the same problem as you but on my 400 chev. It turned out to be the rear main seal too. The only problem with it was the engine builder put in the wrong seal-it should have been a align hone rear main seal. Was your Chev 350 align honed? maybe that's it. This seal is just a little bigger. part #720-1962 from Jegs
    I also thought it was the rear of my oil pan because it was chrome so I got the one piece fel pro "rubber like gasket" it's reusable and guarateed not to leak. Rear main seal leaks suck. I pulled my engine twice because of it. I now know that you don't have to do that. I just removed my motor mount bolts and jacked up the engine so I had just enough room to remove the oil pan. Sure beats pulling it out completley. hope this helps.
    I hate to dig up such an old thread but I am having the same problem.

    I have what looks like a rear main seal leak. I put a dye in the oil and used a blacklight. Looked all around the back of the engine and valve covers. The leak is coming from the back of the engine. Inside where the trans is bolted. It doesn't look like it is coming from the cam plug or oil galley bolts. I put in a Fel-Pro offset rear seal. Still leaks.

    My question is the Mr. Gasket part mentioned above, Jegs 720-1962, is for a 400. I have a 350. When I look at what engines that seal fits it only says 400. However when I look at 'stock' seals the 400 and 350 use the same seals. Will the Mr. gasket seal fit a 350? I'm confused.

    Bill
    Last edited by LongT; 02-02-2007 at 04:12 PM.

  9. #9
    thesals's Avatar
    thesals is offline CHR Member Visit my Photo Gallery
    Join Date
    Feb 2004
    Location
    san diego
    Car Year, Make, Model: 66 mustangFB, 69 econline Drag Van
    Posts
    1,527

    Quote Originally Posted by onemangang
    Rear main seal leaks suck.
    try a ford timing cover leak with a studded oil pan
    just because your car is faster, doesn't mean i cant outdrive you... give me a curvy mountain road and i'll beat you any day

Reply To Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
Links monetized by VigLink