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Author Topic:   Pinion seal needs replacing?
stang106
Gearhead

Posts: 750
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001

posted 06-21-2002 10:52 AM     Click Here to See the Profile for stang106   Click Here to Email stang106     Edit/Delete Message   Reply w/Quote
Coming home from a trip through the Rockies, the pinion seal started leaking real bad on my '97 F-150 4X4. I bought more oil on the road and just kept adding it until I got home. Is this a job I can do at home or do I need special tools? Is there anything else I would need besides the seal?
Dave

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4Zsnow
Journeyman

Posts: 51
From: Western Washington, USA
Registered: May 2002

posted 06-21-2002 11:34 AM     Click Here to See the Profile for 4Zsnow     Edit/Delete Message   Reply w/Quote
An impact wrench would be handy.
Drop the drive line from the yoke. Use impact to remove the pinion nut. Remove pinion. I use a big screwdirver to coax the seal out, but correct tool is a seal remover.
Reverse order for new. Tip, make sure you prime seal with some grease. Most new seals come with grease already...

If the pinion has noticable groves where the seal contacts it, you may need a speedy-sleeve.

4Z

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stang106
Gearhead

Posts: 750
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001

posted 06-21-2002 03:49 PM     Click Here to See the Profile for stang106   Click Here to Email stang106     Edit/Delete Message   Reply w/Quote
I'm not sure why this seal failed, but I was doing some VERY heavy towing. Could the pinion bearing fail under these conditions then causing the seal to fail?
Dave

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4Zsnow
Journeyman

Posts: 51
From: Western Washington, USA
Registered: May 2002

posted 06-22-2002 12:47 PM     Click Here to See the Profile for 4Zsnow     Edit/Delete Message   Reply w/Quote
I would think you would hear it if the bearing failed. Grab drive line (w/park brake on and out of gear) see if there is any play. (up/down side-to-side).
I might just have gotten warm or hot and made the seal too flexible.???

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God Bless Big Oil

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stang106
Gearhead

Posts: 750
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001

posted 06-23-2002 02:08 AM     Click Here to See the Profile for stang106   Click Here to Email stang106     Edit/Delete Message   Reply w/Quote
Got a new seal and the rear-end tag says to use synthetic oil. So a simple seal change has already cost me $98.00 Canadian and I get the parts wholesale! Hoe much torque does the pinion nut need? My manual says 15 to 30 ftlbs which must be an error. Don't I need to load the crush sleeve with at least 110 ftlbs?
Dave

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SteveLaRiviere
Administrator

Posts: 36138
From: Saco, Maine
Registered: May 99

posted 06-23-2002 05:46 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by stang106:
My manual says 15 to 30 ftlbs which must be an error. Don't I need to load the crush sleeve with at least 110 ftlbs?
Dave

That is correct, but they are talking in terms of drag. You tighten the nut, which crushes the sleeve, until you have 15-30 lbs/ft of drag.

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'70 Mustang Mach 1, '72 Mustang Sprint, '94 F-150
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MCA Member # 47773

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stang106
Gearhead

Posts: 750
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001

posted 06-23-2002 11:42 PM     Click Here to See the Profile for stang106   Click Here to Email stang106     Edit/Delete Message   Reply w/Quote
Duh, I get it now! Even the boys at the Ford dealer- parts section- couldn't tell me. I assume then that there will be less drag until I get sufficient torque on the nut?
Dave

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SteveLaRiviere
Administrator

Posts: 36138
From: Saco, Maine
Registered: May 99

posted 06-24-2002 03:42 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
LOL! Don't ask a parts guy.

You got it exactly right. As the nut is tightened, the crush sleeve gets compressed and acts as a sort of spring, giving the pinion bearing the right amount of preload, which you measure by how much torque it takes to turn the nut.

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'70 Mustang Mach 1, '72 Mustang Sprint, '94 F-150
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MCA Member # 47773

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