bearing is not fitting right in my mind. Every rear end I have been into, primarily Ford
cars and light trucks, have had two pinion bearings, not just one. And the statement of
removing the front cover (trying to remember the entire unit is backward to a front engine
truck) to check the pinion bearing is nearly imposable. The spider gears, their housing is
in the way, as well as the bearings for the spider gear housing, not to mention the pinion
gear itself. You would have to pull the axels and disassemble the rear end completely to
go at it from the front. But the pinion bearing and pinion shaft will still come out the
rear, drive shaft/transmission side.
For one bearing to go bad, the outer or rear bearing, the seal would probably go away,
allowing dirt, road debris into the bearing, causing a severe leak. If this is not the
case then I will jump on the same boat or band wagon as others here and go back to drive
line out of balance, U joints bad, drive shaft not installed correctly in pinion coupling.
The rear end is pretty tough, unless it was not assembled correctly when new, but then
I would suspect a rear end "howl" at certain speeds if the pinion gear were allowed to
move even a few thousands of an inch. It is set up in there with thousands, feeler gauges
and micrometers, not a tape measure and "if it is within an 1/8 of an inch it is good".
I would ask how they know it is the pinion bearing? Grab the U joint yoke and see if
it wiggles. I doubt it will. This is what causes it to vibrate the coach? Not if it does
not move.
Russ
----- Original Message -----
From: "Chuck & Mary Boros" <elmerfletcher@yahoo.com>
To: <Diesel-RVs@yahoogroups.com>
Sent: Thursday, February 07, 2008 10:18 AM
Subject: Re: [Diesel-RVs] Re: Vibration when coasting.
: Mike,
: That question came up when we were having U joint problems. A call to the differential
manufacturer produced their specs on end play. There has to be some end play. We ended
up within the specs and did not remove the pinion for inspection. I still maintain that
there is cause to suspect the U joints. At least remove and inspect before the next more
expensive option. In our case, ride height was the cause. Chuck B
:
: ucdavisgsm <mike@fleming.cc> wrote:
: Phil, I'm w/Fred on this. Diagnosis on a tapered bearing w/out
: pulling it is tough unless the thing has seized & spun so that you can
: see outward signs of the damage.
: And IF it is the bearing, there is a cause. Mere end play of the
: assembly doesn't mean bearing for sure and exclusively. IF bearing is
: bad, cause could be incorrect installation initially, could be
: inadequate lube, could be overstress from some outa balance part like
: drive shaft or u-joints. IIWM, I'd get new U-joints while in this
: process regardless, and have the driveline checked for balance while
: its out of the rig. Those won't cost a lot, and after opening the
: rear end, it would be nice to go home feeling like the problem was
: truly solved. Mike
:
: --- In Diesel-RVs@yahoogroups.com, fred hengel <fjh1@...> wrote:
: > Hi Phil,
: > I have been wondering just how the pinion bearing was diagnosed without
: > pulling it...
: > Fred Hengel
:
:
:
:
:
:
: Chuck & Mary Boros
: 04 Windsor 02 Ford Ranger
: Shelby Dog, Miss Kitty, Mr Lucky Cat
:
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