Many owners have reported oil leaks at the rear main seal even after replacing the seal, myself included. Recently Tony Lentini (aka Tony and Ginny 429) found a Serviceman bulletin published in February 1965 which details a new Rear Main Bearing design and a chamfer modification to the bearing cap which is applicable to early 1965 engines as well as 1963 and 1964 engines. The double-slotted bearing and chamfer improve oil drainage from the seal area to reduce the possibility of leakage. This information is new to us so currently we don’t have any testimony about the effectiveness of this fix. We can assume Cadillac did their homework and the fix seems plausible. Member Matti Roth received this information while rebuilding his engine and has applied this fix. We all look forward to hearing positive results when the car is back on the road. I plan to apply this fix to my engine the next time I have the oil pan off.
Here is the February 1965 Serviceman bulletin (Thanks to Tony and Jason)
Feb 1965 Serviceman Bulletin - Rear Main Bearing & Seal
Below are photos posted by Matti of the bearing cap modification and the double-slotted bearing. (Thanks to Matti)
I created this gif (from Matti’s photo) of the oil flow in the slot and chamfer.
When purchasing main bearing sets. please make sure the set contains the double-slotted rear main bearing. Here is a photo posted by Matti of the bearing set. (Thanks again Matti)
SUGGESTED REAR MAIN SEAL
It has been noted that the Caddy Daddy supplied rear seal by Rebuilder's Choice is better than the Best Gasket 3812 in preventing leaks. In the future, we hope to have a separate Help Topic article posted with pictures and details of the differences between the gaskets and perhaps other sources for this Rebuilder's Choice rear seal. This rear main seal can be ordered thru Caddy Daddy by Clicking Here.
Tags:
Thanks Tony & Kurt. This has been added to our Help Page.
I have added an addendum to the end of this article discussing the Serviceman Bulletin regarding the use of a new double groove rear main bearing and modifications to rear main bearing cap, to include a link to the recommended Rebuilder's Choice rear main seal and noted we will hopefully have a separate help topic posted regarding the rear main seals in the future. When a concise article with pictures is written regarding the rear main seal options, I will simply link to it from this article.
Since this is another location and topic dealing with oil pan installation and not the rear main seal leak, I do not want to add that to the rear main seal and cap modification article. There are no pictures and just a newer Cadillac Part # (363 2764) referenced and believe the design would be incorporated on any newer oil pan gasket set going forward. If someone wants to write up an article I can scan and send that short section on the oil pan real seal.
Started by Jason Edge in For Sale. Last reply by Jason Edge 22 hours ago. 1 Reply 4 Likes
To see all 1963/64 Cadillacs Listed on eBay in the USA…Continue
Tags: ebay
Started by Chris Gill in Restoration Discussion. Last reply by Chris Gill on Wednesday. 4 Replies 0 Likes
Hi Folks, Just a word of warning here. Take it or leave it... I purchased almost $1,000 worth of carpets, custom mats, and bulk carpet from Stock Interiors over the past year for my 1963…Continue
Started by William Mott in 1963/64 Cadillac Specific Discussion. Last reply by Kurt on Wednesday. 12 Replies 0 Likes
Good Evening all,I just got the 63 caddy back on the road: cleaned up the tank, new sending unit, new Edelbrock electric fuel pump, and Edelbrock relief valve. Still had some vapor lock, but…Continue
Tags: AC
Started by Jason Edge in 1963/64 Cadillac Specific Discussion. Last reply by Tony and Ginny 429 on Wednesday. 10 Replies 0 Likes
I have been intermittently working on parts Car #55, a 1963 Series 62 Four Window Sedan, between work on my new house addition project (ready to start floor framing once foundation and drainage is…Continue
Posted by Patrick Westphal on April 12, 2022 at 1:35pm 1 Comment 0 Likes
I was working on my HVAC system this winter and during the process of taking the dash pad off these two parts fell out. Does anyone know what they are and where they go?
ContinuePosted by Russell L Parr on April 1, 2022 at 9:15pm 6 Comments 0 Likes
I need to replace the bulbs for the speedometer cluster in my instrument panel..
Before I open up the dash, I want to have the necessary bulbs on hand.
Can someone help me determine what bulbs I need, the number of bulbs I need, and where to purchase them?
Your help will be greatly appreciated.
Posted by Russell L Parr on April 1, 2022 at 9:15pm 0 Comments 0 Likes
I need to replace the bulbs for the speedometer cluster in my instrument panel..
Before I open up the dash, I want to have the necessary bulbs on hand.
Can someone help me determine what bulbs I need, the number of bulbs I need, and where to purchase them?
Your help will be greatly appreciated.
Posted by SK on March 23, 2022 at 2:43pm 2 Comments 0 Likes
The temperature gauge of my 63 Eldorado does not work properly.
It goes slowly all the way up and stays there, while the true temperature is around 155-160 F (water in the radiator and/or the top of the thermostat housing).
Where should I start to solve the problem? The gauge itself, the temperature sensor, or the wiring? Or something else? The sensor is a new (aftermarket part)…
ContinueMay 22, 2022 from 8pm to 9:30pm – Zoom
0 Comments 0 LikesAdded by Kurt 2 Comments 1 Like
© 2022 Created by Jason Edge.
Powered by