Pinion nut loose?

ALEIGHTON

MEMBER
2012 FORD F-250
6.7L
V10
TURBO
4WD
AUTOMATIC
150,000 MILES

I replaced the pinion nut, crush sleeve on my truck because the rear differential was leaking oil and the nut had come loose and there were metal filings in the oil.

Within a month the nut is loose again, and the seal is leaking oil. There are no metal filings in the oil.

Why is the new nut loose again? How can I ensure the nut is properly installed?

Edit to tags: V8 diesel engine, no turbo.

3 Replies

JACOBANDNICKOLAS

MECHANIC
109,755 POSTS

Hi,

I'm not showing a non-turbo diesel engine as an option for this vehicle. See pic below. Please confirm that for me. Also, by chance do you know which differential the vehicle has?

Let me know.

Joe

See pic below.

Image (Click to make bigger)

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Sunday, September 24th, 2023 AT 2:27 PM

ALEIGHTON

MEMBER
2 POSTS

Yes, it has a turbo. Sorry for the miscommunication.

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Monday, September 25th, 2023 AT 6:19 AM

JACOBANDNICKOLAS

MECHANIC
109,755 POSTS

Hi,

That helps. The truck likely has a Ford 10.5" differential. If the pinion nut is coming loose, are you staking the new pinion nut after it is torqued? If you do this, the nut should stay tight.

See pic below and let me know.

Let me know.

Joe

See pic below.

Image (Click to make bigger)