Rear Main Leak?
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!
Replies to This Discussion
-
Permalink Reply by Logan Robb
-
Permalink Reply by Russ Austin
-
Have you checked on the oil sending unit? They like to leak at the top, or it could be valve covers leaking.
-
Permalink Reply by Dennis P. DiBari
-
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
Photos
Members
Forum
Techniques for replacing pinion seal on differential
Started by allen dilley in 1963/64 Cadillac Specific Discussion. Last reply by Dennis P. DiBari 10 hours ago. 3 Replies 0 Likes
My 63 Park Avenue has a leak at the differential. My accomlished, experienced, and reliable mechanic has never replaced a seal of this type. I have a pinion seal and differential gasket. I also…Continue
Tags: Replacement, Seal, Pinion
Brake wheel cylinder bore
Started by Logan Robb in 1963/64 Cadillac Specific Discussion. Last reply by Phillip Hill 18 hours ago. 4 Replies 0 Likes
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 yesterday. 1 Reply 0 Likes
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 yesterday. 5 Replies 0 Likes
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
Blog Posts
Edelbrock Carb Block off Plates
Posted by Chase on March 12, 2025 at 2:05pm 8 Comments 0 Likes
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…
ContinueNew old stock seat material
Posted by Ray Schick on August 22, 2024 at 6:25pm 2 Comments 0 Likes
I bought this seat material thinking that it’s…
Loud air moving sound within carb with cleaner removed
Posted by Dave Fehrle on March 23, 2024 at 3:23pm 8 Comments 1 Like
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?
Events
© 2025 Created by Jason Edge.
Powered by
