[alrobjr]

please help me in removing rear oil seal from my 1969 buick 350 engine. i dont want to remove my engine.can you tell me the best seal to replace? i really appreciate all the advive that i can get from my hotrodder pals. thanks alot "BIG AL".

[73oldsman]

What rear seal? Oil pan seal, engine rear main seal or ......? More info please!

[alrobjr]

Thanks For Your Replie 73oldsman .its The Rear Oil Seal On My Engine.a Mechanic Adviced Me That On A 1969 350 It Has A Rope Seal An You Do Not Have To Remove The Engine. Give Me Some Advice On This Mr 73oldsman. Thanks For Your Help "big Al".

[jim..]

Not entirely sure on your car,but on some of the older fords with the rope type seals,you have to remove the oil pan as well as the rear main cap,on some of them I've found it just as easy to pull the tranny and replace with one peice seal and speedy sleeve if necessary.

[cboy]

Unfortunately, the free online Autozone manuals for Buick only go back to 1975 so this link may not apply...but it does include the '75 350 so I'm guessing it would be correct. You'll soon know when you pull the main cap.

Also, the AutoZone site has now requires a login to use their manuals. The login, however, does not require any personal information other than your email address, so it is very easy and non-intrusive to get a name and password to enter the site. Because of the login, I'm not sure you will be able to access the manual so I am also including the rather lengthy description included in the manual for the seal replacement.


http://www.autozone.com/servlet/UiBr...3d800b1426.jsp

Here is the actual install proceedure:


Except One Piece Seal

1.

Remove the oil pan. Remove the oil pump where required. Remove the main bearing cap.
2.

Pry the lower seal out of the bearing cap with a suitable tool, being careful not to gouge the cap surface.
3.

Remove the upper seal by lightly tapping on the one end with a brass pin punch until the other end can be grasped and pulled out.
4.

Clean the bearing cap, cylinder block and crankshaft mating surfaces with solvent. Inspect these surfaces for gouges, nicks and burrs.
5.

Apply a light coat of engine oil on the seal lips and bead, but keep the seal ends clean.
6.

Insert the tip of the installation tool between the crankshaft and the seal in the cylinder block. Place the seal between the crankshaft and the seal of the cylinder block. Place the seal between the tip of the tool and the crankshaft, so that the bead contacts the tip of the tool.

Do not remove the tool until the opposite end of the seal is flush with the cylinder block surface.

7.

Remove the installation tool, being careful not to pull the seal out at the same time.
8.

Using the same procedure, install the lower seal into the bearing cap. Use your finger and thumb or a wooden hammer handle to level the seal into the cap.
9.

Apply sealer to the cylinder block only where the cap mates to the surface. Do not apply sealer to the seal ends.
10.

Install the rear cap and torque to specification.
11.

Install the oil pump and oil pan.

Click image to see an enlarged view
Fig. 1: Installing the lower main bearing oil seal

Click image to see an enlarged view
Fig. 2: Cutting off the lower seal ends


One Piece Seal

1.

Remove the transmission from the vehicle.
2.

Using the notches provided in the rear seal retainer, pry out the seal using the proper tool.

Care should be taken when removing the seal so as not to nick the crankshaft sealing surface.

3.

Before installation lubricate the inside and outside diameter of the new seal with clean engine oil.
4.

Install the seal on tool J-3561 or equivalent. Thread the tool into the rear of the crankshaft. Tighten the screws snugly, this is to insure that the seal will be installed squarely over the crankshaft. Tighten the tool wing nut until it bottoms.
5.

Remove the tool from the crankshaft.
6.

Install the transmission.

Click image to see an enlarged view
Fig. 3: One piece seal removal notches

Click image to see an enlarged view
Fig. 4: Installing the one piece seal


One Piece Seal Retainer and Gasket

1.

Remove the transmission from the vehicle.
2.

Remove the oil pan.
3.

Remove the retainer and seal assembly.
4.

Remove the gasket.

Whenever the retainer is removed a new retainer gasket and rear main seal must be installed.

5.

Installation is the reverse of removal. Once the oil pan has been installed, the rear main seal may be installed.

[1939P7]

Depending on room to remove the oil pan you may have to
jack up the engine a bit also . Other than that they sell the tool/s
to do the rear main seal job , get a good book & tools . Don't be surprised
if you have excess crankshaft end play or worn bearings, that may be part of
the leaky seal.the hardest part is if you don't have a lift.
I can vouch for that.