Question about 1991 Ford F250

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Ring and pinion adjustment

Full floating 10' rear.Replaced carrier and pinion bearings and can't get pinion adjustment correct. did it twice according to manual. set preload at 20 with axles out.Drive 10 miles pinion area of differential hot to touch

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  • acpars Jul 06, 2008

    Advice good but not solved problem.Ihave adjusted to spec 3 timees,have good backlash between ring and pinion. 20" pounds on preload,I even backed nut off set preload and still heats up.

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Hello sir ...

RING AND PINION TOOTH CONTACT PATTERN.—The ring and pinion tooth contact pattern is used to double-check ring and pinion adjustment. To check the accuracy of your adjustments, coat the ring gear teeth with a thin coat of red lead, white grease, hydrated ferric oxide (yellow oxide or iron), or Prussian blue. Turn the ring gear one way and then the other to rub the teeth together, producing a contact pattern on the teeth. Carefully note the contact pattern that shows up on the teeth where the substance used has been wiped off. A good contact pattern is one located in the center of the gear teeth (fig. 5-21). Figure 5-21 shows several ring and pinion gear contact patterns. Study each and note the suggested correction for the faulty contact

Posted on Jul 06, 2008

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Hi,
It could be that the carrier is heating up and expanding, and that you have the carrier bearing adjustment nut set too tight. In use there should be enough float to allow it to warm up without being excessively tight.

The pinion bearing should have the preload you suggested, with the shims allowing for adjustment. As this functions under load and is pushing on the pinion bearing, it should have a preload to prevent backlash on reversing.

If you have used grease on the bearings on assembly, this should be replaced with oil once things start moving and aid heat dissipation. Obviously using a EP oil, perhaps with MoS2 added if you want your work to last.

Just make sure the carrier bearing adjuster can be undone by fingers - not torqued up.

Thanks for using Fixya!

Posted on Jul 06, 2008

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Hope this link will be helpful...

http://www.ffcobra.com/FAQ/gears.html

Thanks for choosing Fixya.

Posted on Jul 05, 2008

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Back to Top
Disassembly Make sure that you have all the parts and tools you will need. The extent of disassembly depends on the job being done and the inspection findings. Lift the vehicle using an appropriate lift or a jack and safe jack stands. Always make certain that the vehicle is safely supported before working underneath. Unbolt the driveshaft from the yoke. Remove the differential cover or unbolt the third member. Let the oil drain into a suitable container. Please recycle your waste oil. Remove c-clip axles by removing the differential cross pin bolt and cross pin shaft, pushing the axles in and pulling the c-clips. Full float axles are unbolted at the hubs. Punch both carrier caps with identification marks so that you will be able to re-install them on the same side and in the same direction. Most carriers can be pried out of the housing with a pry bar. Further disassembly depends on the job being done. If you're changing the ring and pinion or the pinion bearings, remove the pinion nut with an air gun while holding the yoke, or use a long breaker bar and brace the yoke (bolt it to a long board) so that it can't move. Knock the pinion gear out to the rear with a brass punch, taking care not to damage the threads. Keep track of the location and thickness of all of the original shims. Pinion bearings must be pressed off. Carrier bearings can be pulled using a bearing puller. Internal parts (inside the carrier) can be removed as necessary.



Inspection

Inspect all bearings and races for pitting or uneven wear. The inner carrier bearing races should not spin on the carrier journals. The carrier races should have a snug fit in the housing. Inspect the carrier race bores for grooves from spinning races. The side gear bores inside the carrier should not have any abnormal wear. All gear teeth (including the spider gears) should be smooth but not excessively shiny. Inspect all gear teeth for pitting, chips, breaks, and for signs of uneven wear and overheating. Inspect positraction clutches for scoring and wear. Inspect the axles for pitted, grooved, or dull and rough bearing surfaces. Check for worn axle splines. All questionable parts should be replace
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