I am running Rotella T4 15-40 and it’s runs great-even in the winter. 

Its always has a bit of an oil leak, but getting a little heavier. Do we think this could be the rear main seal leak? 

As always, thanks for the help!

Views: 33

Reply to This

Replies to This Discussion

Have you checked on the oil sending unit?  They like to leak at the top, or it could be valve covers leaking. 

Hi Logan,

     Russ is right.  Check that nothing is leaking from the top and dripping down.  The sender switch is in the rear as he said.  Also, from the valve cover gaskets - that the return holes are clear under the valve covers.  If not, it probably is the rear main seal (the Achilles Heel of the 429 CI).  Good luck with it.

Dennis DiBari, Cottekill, NY

Thank you!

I had the car out and drove about 50 miles yesterday, the weather was GREAT! Woke this morning, it was SNOWING! Ug, winter isnt done with us yet it seems. 

Logan,

     Like you, I live in the north and don't even want tot hear the word "winter" again.  Good luck with your Caddy!

Dennis DiBari, Cottekill, NY

RSS

Photos

  • Add Photos
  • View All

Forum

Brake wheel cylinder bore

Started by Logan Robb in 1963/64 Cadillac Specific Discussion. Last reply by Dennis P. DiBari 41 minutes ago. 2 Replies

While compiling a parts list for order, I know I have a leaky brake cylinder as well. I note there are two different sizes. If replacing-does the bore size matter as long as they are both the…Continue

Front End Rebuild 64 Fleetwood

Started by Logan Robb in 1963/64 Cadillac Specific Discussion. Last reply by CHRIS CARLSON 2 hours ago. 1 Reply

I am planning to completely overhaul my front end this spring/summerI think I have a decent parts list going:Upper Ball JointsLower Ball JointsInner Tie RodOuter Tie RodUpper Control Arm…Continue

Rear Main Leak?

Started by Logan Robb in 1963/64 Cadillac Specific Discussion. Last reply by Dennis P. DiBari 5 hours ago. 5 Replies

I am running Rotella T4 15-40 and it’s runs great-even in the winter. Its always has a bit of an oil leak, but getting a little heavier. Do we think this could be the rear main seal leak? As always,…Continue

Just Checking in Post Surgery!

Started by Jason Edge in 1963/64 Cadillac Specific Discussion. Last reply by Dennis P. DiBari 10 hours ago. 4 Replies

Had my double surgery on left arm March 4 on wrist and elbow to address Cubital Tunnel Syndrome and so far so good. Basically the open me up at these two locations and move the Ulner nerve around to…Continue

Blog Posts

Edelbrock Carb Block off Plates

Posted by Chase on March 12, 2025 at 2:05pm 8 Comments

Hey guys,

I have installed the same Edelbrock carb and have done everything the same as Jason’s carb and intake project. In the spring and summer months the car starts, runs and idles great! In the fall and winter months on a cold start, the car starts awful and wants to die until it warms up. I have to keep my foot on the throttle until it warms up or it will idle just terrible and try to die. Once it’s warm, it runs fantastic! Whats going on here? I was thinking of removing the…

Continue

'63 Tailfin Tales

Posted by Mark Mata on February 22, 2025 at 5:00pm 9 Comments

New old stock seat material

Posted by Ray Schick on August 22, 2024 at 6:25pm 2 Comments

I bought this seat material thinking that it’s…

Continue

Loud air moving sound within carb with cleaner removed

Posted by Dave Fehrle on March 23, 2024 at 3:23pm 8 Comments

While checking my Carter carb with engine running, I took the air cleaner off and there was a very loud hissing sound of air. I placed a piece of paper over the carb and it didn’t move up or down, is this normal?

Videos

  • Add Videos
  • View All

© 2025   Created by Jason Edge.   Powered by

Badges  |  Report an Issue  |  Terms of Service