Northstar Engines and System Technical Discussion Discussion, 2nd Design "Cartridge" Rear Main Seal in Cadillac Engine Technical Discussion; The service bulleting on the rear main seal states engines up to 2/29/96 build date have an 8mm depth pocket ...
The service bulleting on the rear main seal states engines up to 2/29/96 build date have an 8mm depth pocket for the rear mail seal and the engines produced from 3/1/96 on have an approximate depth of 15mm for the seal to sit in. I measured my '97 block and it was 13mm. I'm assuming that is close enough to 15mm and that even though the engine has a lip seal, the cartridge seal will work. Correct? I'm assuming a 1997 engine block would have been built after 3/1/96.
Automobile(s): 1997 ETC (GAVE TO STEPSON 2011), 2000 DTS (RIP)
FOUNTAIN HILLS, AZ
Re: 2nd Design "Cartridge" Rear Main Seal
Right - '94 takes the old school lip seal - that one they said required a special tool also, but it was one of those special tools that you really didn't absolutely need - you could devise something else that would work. The second design seal really does require that special tool, and it's different from the tool for the 1st design seal. I'm not sure which tool you have, but if you have the correct one for your '94 block, it will not work on the new design seal on a '97 block The new seals are 2 pieces - one piece presses into the block, the other presses onto the crankshaft output flange - different from anything I have ever seen before.
This is the tool you need - I found this for someone else recently - he bought it for a great deal - 10% of what I paid for mine, just to use it for 30-40 seconds:
I bought j-45930a for my 94. I was going to resell it on ebay anyway after we were done, although it sounds like we didn't need it.
I really do need guidance on how to drop just the tranny. ANy help will be rewarded with basically me saying thanks.
The reason I assume it is the rear main seal is that the car leaks like a sieve only when the engine is running. Based upon everything else I have read, the oil pan or half seals don't leak as much oil as we were seeing.