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Old 04-18-2010, 04:03 PM
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Ford pinion seal

Hey guys I need some info on replacing my pinion seal on my Ford 9 inch. Do you have to Torque the retaining nut after seal replacement ? If you do what is the torque spec? The rear end is out of a 1967 Ford truck.

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Old 04-18-2010, 04:08 PM
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Yes Torque it at 175 ft lbs to 180 . If you are useing a solid spacer. If you are using a crush sleeve it will take more. Which are you using? Once you start crush make sure to check pinion preload about 17 to 27 or so inch pounds if you get more than 30 you'll have to do it all again .JMO

Cole

Last edited by eloc431962; 04-18-2010 at 04:41 PM.
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Old 04-19-2010, 07:58 AM
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If you are only replacing the pinion seal and not replacing any bearings or the crush spacer then torque the nut to 150 foot pounds and use red Locktite on it. This will not mess up the pinion bearing preload. If youa re replacing a bearing or the crush spacer then you have a bigger job ahead of you.

Check the bearings. Many times a pinion seal leak is caused by a bad pinion bearing.
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Old 04-19-2010, 09:04 AM
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I have never replaced a crush sleeve when just replacing a pinion seal, there is no need to.

Vince
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Old 04-22-2010, 04:25 PM
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i didnt replace the sleeve either on a 77 f150 when i replaced the entire carrier and had to swap yokes out

i just carefully tightened it up til it was snug and then a little bit more

has been fine for a year


good luck
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Old 04-22-2010, 06:01 PM
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I never change it either when just changing the seal.


Cole
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Old 04-23-2010, 02:49 AM
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If you want to replace pinion seal w/o removing pinion gear assembly:

Verify no metal shaving in gear oil; stick finger in the oil to check.
Super fine metal shavings may be ok.

Verify rear end is quite on the road; no whining please

Verify Rear end is less than 160F-190F at full operating temperature.
My differential was running at 135F last time I checked.

Verify no up/down play in pinion.

Measure torque required to rotate pinion nut (in car) with vehicle on jack stands,in neutral, no parking brake.

Mark pinion nut to pinion shaft to companion flange (liquid paper works).

Remove pinion nut , replace seal.

Put lock tight on pinion nut.

Tighten pinion nut 1/8 turn past original marked (indexed) position.
Must require less than 200 ft-lbs to get 1/8 turns past your index marks. Index marks are better indicator than torque, if it was installed correctly before.

Verify same torque required to turn pinion (in car) before seal was replaced (neutral, on stands, no parking brake).

If about same torque required to rotate pinion (in car) then ping the pinion threads at pinion nut to make sure nut does not back off.

If more torque is required to rotate pinion (in car) then pinion assembly must be removed and new crush sleeve or solid spacer installed to spec (approx 15 to 30 in-lbs).

Solid spacer recommended for very high power applications.
Crush sleeve will last many year for reasonable horse power applications.

Last edited by 001mustang; 04-23-2010 at 03:04 AM.
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Old 10-29-2010, 11:22 PM
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Did you get er done?
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Old 10-30-2010, 03:25 PM
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There really isnt a set tourqe spec. What you want is rolling tourqe. Get a beam style tourqe wrench and turn the nut backwards and see how much rolling tourqe you have. Write that number down and replace the seal. If you have a cruch collar, use the beam and tourqe the nut back down a slight bit tighter than the intial spec that way you will recrush the crush.
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