454 rear main

[hmatiak]

Having to replace my rear main i the '86. Is this a 2 pc seal? Also will the flywheel have to be pulled to change it? Thanks

-Heath

 

[norcal70blazer]

Think its a 1-piece seal...

 

[hmatiak]

Well its a 2 pc............ anyone know if the flywheel will have to be pulled?

 

[toomany]

Well its a 2 pc............ anyone know if the flywheel will have to be pulled?

From my Haynes manual:

Rear Seal
Small Block V8 engines (before 1986) and all Big Block engines

1.)The rear main seal can be replaced with the engine in the vehicle. Refer to the appropriate sections and remove the oil pan and oil pump.

2.)Remove the bolts and detach the rear main bearing cap from the engine.

3.)The seal section in the bearing cap can be pried out with a screwdriver.

4.)To remove the seal section in the block, tap on one end with a hammer and brass punchor wood dowel until the other end protrudes far enough to grip it with a pair of pliers and pull it out. Be very careful not to nick or scratch the crankshaft journal or seal surface as this is done.

5.)Inspect the bearing cap and engine block mating surfaces, as well as the cap seal grooves, for nicks, burrs and scratches. Remove any defects with a fine file or deburing tool.

6.)A small seal installation tool is usually included when a new seal is purchased. If you don't recieve one, they can also be purchased separately at most auto parts stores. [every seal I have done has come with a tool]

7.)Using the tool, install one seal section in the cap with the lip facing the front of the engine (if the seal has two lips, the one with the helix must face the front). The ends should be flush with the mating surface of the cap. Make sure it is compleyely seated.

8.)Position the narrow end of the tool so that is will protect the backside of the seal as it passes over the sharp edges of the ridge of the block.

9.)Lubricate the seal lips and the groove in the backside with molybase grease or clean engine oil-do not get any lubricant on the seal ends. Insert the seal into the block, over the tool.

10.)Push the seal into place, using the tool slike a "shoehorn." Turning the crankshaft may help dray the seal into place. When both ends of the seal are flush with the block surface, remove the tool.

11.)Lubricate the cap seal lips with molybase grease or clean engine oil.

12.)Carefully position the bearing cap on the block, install the bolts and tighten them to 10 to 12ft-lbs only. Tap the crankshaft forward and backward with a lead or brass hammer [plastic or rubber dead blow would be better IMO] to line up the main bearing and crankshaft thrust surfaces, then tighten the rear bearing cap bolts to the specified torque (110ft-lbs).

13.)Install the oil pump and pan.

 

[hmatiak]

From my Haynes manual:

Rear Seal
Small Block V8 engines (before 1986) and all Big Block engines

1.)The rear main seal can be replaced with the engine in the vehicle. Refer to the appropriate sections and remove the oil pan and oil pump.

2.)Remove the bolts and detach the rear main bearing cap from the engine.

3.)The seal section in the bearing cap can be pried out with a screwdriver.

4.)To remove the seal section in the block, tap on one end with a hammer and brass punchor wood dowel until the other end protrudes far enough to grip it with a pair of pliers and pull it out. Be very careful not to nick or scratch the crankshaft journal or seal surface as this is done.

5.)Inspect the bearing cap and engine block mating surfaces, as well as the cap seal grooves, for nicks, burrs and scratches. Remove any defects with a fine file or deburing tool.

6.)A small seal installation tool is usually included when a new seal is purchased. If you don't recieve one, they can also be purchased separately at most auto parts stores. [every seal I have done has come with a tool]

7.)Using the tool, install one seal section in the cap with the lip facing the front of the engine (if the seal has two lips, the one with the helix must face the front). The ends should be flush with the mating surface of the cap. Make sure it is compleyely seated.

8.)Position the narrow end of the tool so that is will protect the backside of the seal as it passes over the sharp edges of the ridge of the block.

9.)Lubricate the seal lips and the groove in the backside with molybase grease or clean engine oil-do not get any lubricant on the seal ends. Insert the seal into the block, over the tool.

10.)Push the seal into place, using the tool slike a "shoehorn." Turning the crankshaft may help dray the seal into place. When both ends of the seal are flush with the block surface, remove the tool.

11.)Lubricate the cap seal lips with molybase grease or clean engine oil.

12.)Carefully position the bearing cap on the block, install the bolts and tighten them to 10 to 12ft-lbs only. Tap the crankshaft forward and backward with a lead or brass hammer [plastic or rubber dead blow would be better IMO] to line up the main bearing and crankshaft thrust surfaces, then tighten the rear bearing cap bolts to the specified torque (110ft-lbs).

13.)Install the oil pump and pan.

Much thanks!!!

 

[4X4HIGH]

BBC's were 2 piece rear mains until 1991 then they became 1 piece. Yes you can change the seal without removing the flywheel.