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DonPal
TBI Slant 6
Joined: 01 Sep 2006
Posts: 219
Location: Tolland, Ct. 06084
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Post subject:
7.25 Axle Shaft Seal Leather Lip Points Toward Differential?
(Sun May 20, 2012 8:46 am)
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The 65 Dart Service Manual does not have a sectional view showing the axle shaft seal installation.
It does have a sectional view showing the pinion seal & the leather lip is pointed toward the differential & not toward the driveshaft.
Consequently I'm assuming the axle shaft seal leather lip would point toward differential.....can anyone confirm that?
I'm thinking of installing the seal in the housing so that it barely clears the axle bearing retaining collar inorder to move the lip to a better portion of the axle shaft where wear & pits do not exist.....does this seem reasonable. It appears that the seal can be installed as close as 1.3 inches to the housing flange & it won't hit the bearing collar when the axle is installed.
_________________
1965 Dart 75k, 225, 1920 holley/alum intake, 2 1/4 single exh., sbp manual scarebird front disc, 7 1/4 rear 2.94 sure grip, 14 x 4.5 OEM wheels, 833 OD with hyd. clutch, HEI, electric fan, ram air/heated air, Accusump. Goal-daily driver with good mpg.
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Fopar
6 Pack Dart
Joined: 02 Nov 2002
Posts: 1867
Location: Eugene, Oregon
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Post subject:
(Sun May 20, 2012 2:59 pm)
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Lip should point toward the lub you want to keep in.
Richard_________________  
Part of Tyrde-Browne Racing |
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Doc
Guru
Joined: 14 Oct 2002
Posts: 4978
Location: Working in Silicon Valley, USA
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Post subject:
(Mon May 21, 2012 8:52 am)
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Axle seals are sensitive to any cocking or distortion so attempting to install one "1/2 way in", with-out seating the seal on the machined shoulder, at the end of it's receiver bore, could lead to a leak.
If you have an axle shaft with a damaged sealing surface, find a replacement axle. (I have a bunch of spares, if needed)
DD
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DonPal
TBI Slant 6
Joined: 01 Sep 2006
Posts: 219
Location: Tolland, Ct. 06084
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Post subject:
(Mon May 21, 2012 3:13 pm)
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| Quote: | | attempting to install one "1/2 way in", with-out seating the seal on the machined shoulder, at the end of it's receiver bore, could lead to a leak |
Understand importance of maintaining seal perpendicular to shaft.
Maybe if I placed a spacer against the machined axle housing shoulder the seal would have the spacer to seat against that keeps it's perpendicular to the shaft?
Based on preliminary measurements I'd need a 1/8 spacer. The rear axle rebuild kit contains a significant number of shims intended for adjusting the preload of the pinion bearing that are 2.250 OD with a significantly larger ID than the axle shaft. The housing has a 2.230 bore to accept the seal. If I take .020 off the shim dia. & stack about 5 of them I'll get the 1/8 spacer that's enough to pull the seal off the shaft wear/pit area.
I base that 1/8 by sliding the seal onto the axle & positioning it based on the distance from the bearing surface that seats on the axle housing bearing counterbore.
I like this approach because it essentially puts me on a full diameter axle shaft, totally unworn, with a great polished finish.
If that concept doesn't work I might take you up on an alternate axle.
Thanks.............Don
ps: what's the theory on why the pits only occur where the seal touches the shaft? ...Either side of that point is brightly polished?
_________________
1965 Dart 75k, 225, 1920 holley/alum intake, 2 1/4 single exh., sbp manual scarebird front disc, 7 1/4 rear 2.94 sure grip, 14 x 4.5 OEM wheels, 833 OD with hyd. clutch, HEI, electric fan, ram air/heated air, Accusump. Goal-daily driver with good mpg.
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DonPal
TBI Slant 6
Joined: 01 Sep 2006
Posts: 219
Location: Tolland, Ct. 06084
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Post subject:
SK 13418 is thinner than Mopar leather axle seal
(Sun Jun 10, 2012 8:37 am)
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I placed a factory "thick" leather type axle seal on one side where the axle was wear free & without pits with about .1 thick shim behind the seal to push the seal closer to the bearing.
I placed a SKF 13418 nitrile seal on the other side of the axle with .15 thick shim behind the seal to push it closer to the bearing & well off the worn & pitted area of the axle shaft....there was room to add another .1 shim at a later date! The SKf 13418 seal is thinner (.313) than the original leather Mopar seal which allows a thicker shim to be placed behind it......and the seal still has plenty of clearance to the bearing from rubbing.
The seal lips of both seals are located equidistant from the inside seal seating surface so the thinner the seal....the more shim thickness tolerated.
I decided to test the leather seal against the nitrile for durability in this application & see who the winner would be over the long haul....I wonder what variables would render the test questionable?
I'm also thinking there is a possibility that leather absorbs & holds water more than any type rubber & that could lead to corrosion of the shaft immediately contacting the leather seal?
_________________
1965 Dart 75k, 225, 1920 holley/alum intake, 2 1/4 single exh., sbp manual scarebird front disc, 7 1/4 rear 2.94 sure grip, 14 x 4.5 OEM wheels, 833 OD with hyd. clutch, HEI, electric fan, ram air/heated air, Accusump. Goal-daily driver with good mpg.
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