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BS 40644 installation
#1
This coming week I will be installing a Fel-Pro BS 40644 rear main seal on a 2003 Ford 6.8L V10. As pulled from the box, the seal sleeve is oriented with the wide opening on the open side of the seal, and the narrow opening on the flat side of the seal. Is this orientation correct? I'm not sure how many hands have been in the box at the parts store. If this sleeve orientation is correct, that would position the seal open side toward the inside of the engine, or on the seal OD the gray material would be toward the inside of the engine and the black, lipped material towards the outside (rear) if the engine. Is this correct also?

Thanks
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#2
Hi,

This is a PTFE or Teflon RMB (rear main bearing) seal that you are installing - PTFE RMB seals look and can be oriented differently than traditional lip seals.

The plastic sleeve is there to help you install the seal. The sleeve is wider on one side, the wider portion fits over the crankshaft. The sleeve will stretch the seal’s lip over the crankshaft. The seal will be installed with the thinnest I.D. of the seal or edge of the seal’s lip facing the front of the engine. If you determine the plastic sleeve may have been reversed from handling (was the packaging not factory sealed when you purchased it?), you can flip the installation sleeve around so it is facing correctly. Without the installation tool, the lip of the seal would catch on the end of the crankshaft & try to fold over resulting in a leak.

Remember, the sealing area of the seal & crankshaft must be clean & dry for the installation. No lubrication of any type is to be used in this area. You can apply a light coat of oil on the outside diameter to help the seal slide into the bore, but make sure nothing gets on the inside lip or the crankshaft.
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#3
(06-12-2017, 02:10 PM)Support Wrote: Hi,

This is a PTFE or Teflon RMB (rear main bearing) seal that you are installing - PTFE RMB seals look and can be oriented differently than traditional lip seals.

The plastic sleeve is there to help you install the seal. The sleeve is wider on one side, the wider portion fits over the crankshaft. The sleeve will stretch the seal’s lip over the crankshaft. The seal will be installed with the thinnest I.D. of the seal or edge of the seal’s lip facing the front of the engine. If you determine the plastic sleeve may have been reversed from handling (was the packaging not factory sealed when you purchased it?), you can flip the installation sleeve around so it is facing correctly. Without the installation tool, the lip of the seal would catch on the end of the crankshaft & try to fold over resulting in a leak.

Remember, the sealing area of the seal & crankshaft must be clean & dry for the installation. No lubrication of any type is to be used in this area. You can apply a light coat of oil on the outside diameter to help the seal slide into the bore, but make sure nothing gets on the inside lip or the crankshaft.
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#4
Hi!

If you tried to respond, your post did not come through, only a quote of our reply!
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