Proper pinion bearing preload procedure for 10.5" sterling. - Diesel Forum -
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post #1 of 6 (permalink) Old 09-29-2007, 11:33 AM Thread Starter
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Proper pinion bearing preload procedure for 10.5" sterling.

I was surfing the web looking for an answer to my topic question when I found this site. Nice place you'all have here!
Well, the rear in my sons 2004 F-250 lost a pinion shaft bearing. To make a long story short, we ended up replacing the rear with a Expedition salvage yard rear. In the process we discovered that there were two differences between an F-250 rear and an Expedition rear. One being that the pinion flange on the Expedition is a smaller bolt patern and the lug stud threads are course not fine like on the F-250. Rather than change the hubs we did the lazy fix in that we bought different lug nuts. The pinion flange had to be changed to accomodate the driveshaft flange. When reading the Haines manual to get a torque value for the pinion nut, there wasn't one. Instead it went on about inch pound torque wrenches and measuring the inch pound value that it takes to turn the pinion before disassembly and apply that value to the new...
My question to you is does anybody have a tried and true method to adjust this? We're nervous to drive it until this is adjusted properly. Thanks in advance.

Bobby Bananas
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post #2 of 6 (permalink) Old 09-29-2007, 11:52 AM
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Re: Proper pinion bearing preload procedure for 10.5" sterling.

First thing. Why use an expedition rear end? It is not the same as the f250. The expedition uses 5 lug and the f250 uses 8 lug. Also the expedition axle is a semi floating axle. The F250 is a full floating axle. Second is the inch pounds it takes to turn the pinion shaft is right on the money.

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post #3 of 6 (permalink) Old 09-29-2007, 03:06 PM Thread Starter
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Re: Proper pinion bearing preload procedure for 10.5" sterling.

This Expedition was 4WD with a Powerstroke. Rear is a full floater with 8 lugs. The only difference is the bolt pattern on the pinion flange and the number of threads per MM on the lug studs (fine threads on the F-250, course on the Expedition). Other than that, the axles are identical.

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post #4 of 6 (permalink) Old 09-29-2007, 04:29 PM
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Re: Proper pinion bearing preload procedure for 10.5" sterling.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Bananas</div><div class="ubbcode-body">This Expedition was 4WD with a Powerstroke. Rear is a full floater with 8 lugs. </div></div>

Now it's beginning to make sense. You're confusing Ford's oversized SUVs. The Expedition is the half-ton jobbie based on an F-150 chassis, and the biggest engine available is a 5.4L V-8 gasser. The rear axle is a Ford SLA with independent suspension. No way is that axle going to bolt onto a SuperDuty pickup.

But you're talking about the Excursion, which begins life an an F-250 regular-cab pickup chassis, and has an optional diesel engine and a Ford "Sterling" 10.5" rear axle.

Do a search on "pinion seal" in the '99-up forums and you'll find several times where I posted the detailed procedures from the Ford workshop manual. Ignore the procedures for a Dana 80 rear axle, as they are a bunch different. I won't post all of it again yet, but I'll give you the short version to answer your question:

<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">

2004 F-Super Duty 250-550/Excursion Workshop Manual
SECTION 205-02E: Rear Drive Axle/Differential Ford 10.50-Inch Ring Gear


Drive Pinion Flange and Drive Pinion Seal


NOTE: The rear axle shafts must be removed to prevent drag during drive pinion bearing preload adjustment.

Install a Nm (inch-pound) torque wrench on the pinion nut, and record the rotational torque required to maintain rotation of the pinion through several revolutions.

CAUTION: After removal of the pinion nut, discard it. A new nut must be used for installation.
Mark the pinion flange in relation to the drive pinion stem to ensure proper alignment during installation.


Tighten the pinion nut, rotating the pinion occasionally to make sure the cone and roller bearings are seating properly. Take frequent cone and roller bearing torque preload readings until the original recorded preload reading is obtained by rotating the pinion with a Nm (inch-pound) torque wrench.

If the original recorded preload is lower than specifications, tighten to the appropriate specification for used bearings. If the preload is higher than specification, tighten the nut to the original reading as recorded. Refer to Torque Specifications (below)... </div></div>


Rotational Torque Ranges
Pinion bearing preload = 1.8-3.3 Nm (16-29 lb-in)

Now, assuming you screwed up and didn't determine the preload before you removed the pinion nut, your next question is what do you do now? And my answer is "I don't know, but I suspect you're up Stink Creek without a paddle." That's why they make Ford techs. Hope you can find one that knows his stuff. [img]/forums/images/%%GRAEMLIN_URL%%/crazy.gif[/img]

My Sierra Blanca in the sig pic was a great pickup for 11.5 years. I sold it a coupla years ago. I drove a hand-me-down 2003 F-150 SuperCrew 4.6L 2V for a while, but it was unacceptable for towing more than a rowboat. Replacement is a 2012 F-150 EcoBoost SuperCrew Lariat that tows my 5,000-pound TT like a dream.
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post #5 of 6 (permalink) Old 09-29-2007, 07:01 PM Thread Starter
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Re: Proper pinion bearing preload procedure for 10.5" sterling.

Yea, Excursion not Expedition

The problem is that there was no way to get a rolling torque value before disassembly.The pinion bearing had grenaded. The pinion shaft at that point was flopping around.
Maybe Monday I can find a Ford Techs brain to pick.
Thanks for the info.

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post #6 of 6 (permalink) Old 09-29-2007, 07:36 PM
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Re: Proper pinion bearing preload procedure for 10.5" sterling.

General rule for setting up pinion bearing preloads in LD use are about 15in.lbs for used bearings, and 25 in. lbs for new bearings. If I were setting up the pinion, with used bearings and a new crush collar & seal, I would aim for around 20 in. lbs. rotating torque, if you installed new bearings I would go up towards 25in. lbs.


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