1pc or 2pc?

[Injected1]

How do I know if my motor has a 1pc or 2pc rear main seal without removing the oil pan. I want to replace it if it is a 1pc before I install the motor if it is a 2pc I won't worry about it unless it leaks. Please let me know the key because I am installing the motor this weekend.

Thanks for the help!

 

[ghettosled]

Re: 1pc or 2pc?

a 1 piece usually has an aluminum adaptor that bolts to the backside of the block. On a 2 piece the upper half of the seal is the rear main cap, not the aluminum adaptor. That should get you the right oil pan gasket. This is true 99% of the time.

If you are trying to find out what style crankshaft you have it is possible to have a 2 piece crank with the aluminum adaptor on a 1 piece block (this one actually adapts a 2 piece to a 1 piece, they are not very common but do exist), but it still takes the one piece gasket and oil pan.

hope that makes sense.