Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
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
Reply
#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.
Reply
#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.
Reply
#4
Hi!

If you tried to respond, your post did not come through, only a quote of our reply!
Reply
#5
I am about to to install the same BS40644 in my 86 5.0 Mustang. I am still confused by the description of which direction the sleeve goes as well as which way the seal itself faces. If the wider mouthed part of the sleeve faces inward towards the engine how do you pull it out once the seal is in place? Also does the open side of the seal face inward or outward? Could you post a picture or two?

Thanks, Todd
Reply
#6
(09-26-2017, 09:29 AM)Todd Noel Wrote: I am about to to install the same BS40644 in my 86 5.0 Mustang. I am still confused by the description of which direction the sleeve goes as well as which way the seal itself faces. If the wider mouthed part of the sleeve faces inward towards the engine how do you pull it out once the seal is in place? Also does the open side of the seal face inward or outward? Could you post a picture or two?

Thanks, Todd

Hi Todd,

We do not have any engine here that we could take pictures on, but this should help make things clean. Install the seal with the flat side of the seal facing inward toward the engine, so the open side of the seal faces away from the engine.
Reply
#7
Okay, that makes sense. I understand the flat side of the seal faces inward. I'm going to find something roughly the same diameter to press it in evenly since there isn't much to pound on and I don't want to distort the flange or destroy the seal surface! I know they make a commercial tool for this but I'm a poor working stiff...

So I was going to ask which way the installation sleeve is supposed to face but that just became obvious. The bell-mouthed side faces  outwards. It has to or you'd never be able to pull it out. It would also be too big to fit into the area around the crank flange. Sometimes you just have to think this stuff through!...

Thanks again for your help,
                                       Todd Noel
Reply
#8
(09-26-2017, 03:37 PM)Guest Wrote: Okay, that makes sense. I understand the flat side of the seal faces inward. I'm going to find something roughly the same diameter to press it in evenly since there isn't much to pound on and I don't want to distort the flange or destroy the seal surface! I know they make a commercial tool for this but I'm a poor working stiff...

So I was going to ask which way the installation sleeve is supposed to face but that just became obvious. The bell-mouthed side faces  outwards. It has to or you'd never be able to pull it out. It would also be too big to fit into the area around the crank flange. Sometimes you just have to think this stuff through!...

Thanks again for your help,
                                       Todd Noel

Todd,

You're welcome! A piece of PVC pipe usually works well as part of a makeshift tool as long as you match up the size/thickness to the seal properly.

Good luck with your repair!
Reply


Please note that new posts in this forum must be approved by a moderator before becoming visible.
[-]
Quick Reply
Message
Type your reply to this message here.

Image Verification
Please enter the text contained within the image into the text box below it. This process is used to prevent automated spam bots.

Forum Jump:


Users browsing this thread: 1 Guest(s)