Results 1 to 8 of 8

'94 Corvette Rear Main Seal

This is a discussion on '94 Corvette Rear Main Seal within the LT1 forums, part of the Vehicle Specific category; What the heck am I doing posting in the LT1 section of the Board?! Well... spent the last three evenings ...

  1. #1
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,567

    Black & Blue
    '02 WS.6 / '07 Suburban

    '94 Corvette Rear Main Seal

    What the heck am I doing posting in the LT1 section of the Board?! Well... spent the last three evenings hanging out in the garage with TLS_Addict swapping out the rear main seal in his '94 Corvette. He has a beautiful, low mile vert that has been dropping oil from the bottom of the clutch cover. We looked the engine over and really could not locate any other possible source for the oil leak and dove into the project on Monday.








    I have never wrenched on an LT1, so this was definitely a learning experience. In the Vette, the transmission is supported by an aluminum torque beam that bolts to the differential. The problem is, that after dropping the body X-brace and exhaust out of the way, we found that the torque beam cannot be removed from the vehicle. Per the service manual, you have to beat the beam as far rearward as you can -- until it touches the exhaust bracket at the differential.

    Turns out this gives you just enought room to remove the transmission, but it is a very tight extraction. On installation, we unbolted the exhaust hanger bracket and beat the torque beam back another inch or so. This made the installation much simpler. Our only other serious fight was getting the clutch cover off the back of the engine. We tried popping the clutch fork to the side, but could not get the fork off of the throwout bearing. Unbolting the pivot ball cap and threading the ball into the case provided the needed clearance.





    Everything else was pretty straight forward and the clutch and flywheel appeared to be in good shape. We cleaned everything off with a couple of cans of brake cleaner and then popped the old seal out. It is a rather thin seal with not much of a lip on it compared to the replacement. There was also oil collected at the bottom notch, so it did appear to be the culprit. The crank looked good with no grooves or wear marks, so we put a very light film of Ultra Copper gasket sealant in the seal bore, oiled up the new seal and tapped it home.








    After the install, we took the car for a run last night -- first ride for me in a C4 in quite a while and might be my first ride ever in an LT1 car. It pulls hard and runs fantastic! This also has to be one of the nicest riding Corvettes of the C3 - C4 era that I have ever been in. TLS_Addict simply has an awesome car and really keeps it in nice shape. I enjoy projects like this and really appreciated the opportunity to lend a hand.
    Last edited by pajeff02; 05-14-2010 at 04:20 AM.

  2. #2
    Senior Member 5.0THIS's Avatar
    Join Date
    Oct 2001
    Location
    Colorado
    Posts
    3,704

    red
    95 Z28

    LT1s often have oil leaks from the rear of the intake manifold, it's pretty common. I'm assuming you guys checked on that first

  3. #3
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,567

    Black & Blue
    '02 WS.6 / '07 Suburban

    Absolutely. The car sat overnight in my garage before we started working on it and by the next day there was a significant oil puddle. We looked the top side over before we pulled anything apart. Although it had the usual oil stain (like you would see on an older oil pan or valve cover gasket) there was no where near enough oil there for what was running out the bottom of the cluch cover. We also looked at it again once we had everything off the back of the engine and it just appeared far to dry.

  4. #4
    Senior Member TLS_Addict's Avatar
    Join Date
    Mar 2008
    Location
    PA
    Posts
    1,706

    Ray Charles blue
    1492

    Hey Jeff! The car has not leaked a drop of oil. However I think there is still some residual oil in places where we didnt clean and on parts of the car (exhaust) it still puffs slightly and I can smell it but there is no leak anywhere to be found on the pavement.

    Might have to throw an exhaust on it though.....it sounds just a tad on the wimpy side. I like hte top on on this page Jeff, and it is a Magnaflow. lol


    Says it needs welded on though so that might prove to be a little bit of an issue.

    Thanks again Jeff, it was fun working on the car. We never really hit any snags other than that one bolt, and we wont say how we fixed it! It will stay our little secret.
    Last edited by Y2KPewterSS; 05-18-2010 at 08:32 PM. Reason: Removed non sponsor link

  5. #5
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,567

    Black & Blue
    '02 WS.6 / '07 Suburban

    Glad to hear that we stopped up the leak. That was really a fun project, even with the handful of setbacks. My garage door is always open for stuff like that.

    I am just hooked on the sound of the Magnaflows -- both the T/A and the Vette have that nice deep rumble that just hollers under acceleration. Welding is not an issue -- there's a Hobart MIG welder tucked in the corner of the garage that you probably didn't see.

    Don't forget the cruise in Thursday from 6-8 at Tractor Supply. I doubt the T/A will be ready, so we'll probably trip down with the Monte and the Vette.

  6. #6
    Senior Member TLS_Addict's Avatar
    Join Date
    Mar 2008
    Location
    PA
    Posts
    1,706

    Ray Charles blue
    1492

    Didnt see it but might have to try it out.....lol

    Thanks again guy, I had a good time working on it even though we had a few setbacks. Maybe I will have to get the magnaflow cat back.

  7. #7
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,567

    Black & Blue
    '02 WS.6 / '07 Suburban

    The lift is all yours... just as soon as I get this cutout installed.

  8. #8
    Senior Member TLS_Addict's Avatar
    Join Date
    Mar 2008
    Location
    PA
    Posts
    1,706

    Ray Charles blue
    1492

    Let me know if you need a hand some time. I would love to assist!

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Rear main seal
    By johnfin in forum Firebird / WS6
    Replies: 6
    Last Post: 08-05-2012, 11:59 AM
  2. if i need a new rear main seal...
    By wileyCoyote in forum General Help
    Replies: 6
    Last Post: 01-13-2011, 08:24 AM
  3. Rear main seal?
    By yellowv in forum General Help
    Replies: 6
    Last Post: 08-19-2009, 03:49 AM
  4. rear main seal
    By Y2K_WS6 in forum LT1
    Replies: 1
    Last Post: 06-11-2009, 02:49 PM
  5. rear main seal
    By 00z28bubba in forum General Help
    Replies: 7
    Last Post: 11-20-2008, 11:35 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •