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Thread: Leaking Rear Axle Seals

  1. #1
    Intelligence Guided By Experience MAGNUM SERVICES's Avatar
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    Post Leaking Rear Axle Seals

    Anybody have problems with their rear seals leaking? I replace my rear brakes almost every year, sometimes twice because of leaking seals! This is expensive and frustrating! 8600 GVW, 60003 rear axle, 14 bolt full floater with the 3 1/2 in shoes! I have tried all different deal manufacturers and trimming a wee bit off the tension spring to give more surface tension but nothing solves the problem. The seal surface is smooth with no grooves or ridges so it is not the actual rear end housing. any and all answers will be greatly appreciated! Thanks, Keith
    1996 Sierra 2500,4X4,8600 GVW,"F" Engine,PMD With #9 Resistor Mounted Under Front Bumper using Extension Cable purchased from Burning Oil, Otherwise "Stock" For Now,4L80-E,14 Bolt Full Floater,3.73 Gears,NRA RECRUITER,.40 Cal. Beretta Carried Everywhere, "If Guns Cause Crime,Then Mine Are Defective"! Ted Nugent Line ALL Liberals,Illegals,Rino's,ACLU,NAMBLA,ACORN,George Soros and any one else who HATES this Great Country against the wall! P.I Member # 13

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    Registered User bison's Avatar
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    Check for a plugged breather cap and/or hose .The banjo bolt holding the brass y to the axle could be plugged as well.
    If above checks out,leave the seals protude a bit out of the hub instead of flush,make sure the lip faces the brg.
    98 GMC 2500 HD 6.5 F auto ext 4x4 engine rebuild at 268.000 km,Provent Oil seperator,Vacpump deleted,TM,all gauges,5th wheel.currently at 307.000 km
    95 GMC 2500 6.5 F auto ext sh bx 4x4 ,relocated PMD,OPS,extra glow and aux LP manual switch.In cab fuel gauge.CDR vented at 307.000 km to the atmosfeer.presently 405.000 km
    Wife's d dr.Soon to have pyro,boost,chip and TM
    89 GMC 2500 6.2 auto ext 4x4 relocated OPS 700.000+ KM denoted to ranch duty.
    95 chevy 2500 6.5 F st ext .parts truck .
    2 spare 6.5 F blocks,
    1 is a powerup project, the only 506 block in existence with no outer main cap bolt holes.

  3. #3
    Registered User ak diesel driver's Avatar
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    x2
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  4. #4
    Lucky To Be Here BIGR's Avatar
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    Add me to the list. At 33,059 miles the left rear seal was leaking and I had to get it fixed.
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    I've had those fun experiences too. check the breather hose. the other spot you may have buildup is inside the housing itself, where the hose attaches too. don't let the oil get too low of bad things happen. the other thing i found help is to take a fine layer of grease and coat the shaft when installing the seal.

  6. #6
    Intelligence Guided By Experience MAGNUM SERVICES's Avatar
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    Breather hoses, front and rear are new with new caps on them! Leaving the seal protrude a little bit has never been suggested! I'll give it a try as all it could do is leak too!
    1996 Sierra 2500,4X4,8600 GVW,"F" Engine,PMD With #9 Resistor Mounted Under Front Bumper using Extension Cable purchased from Burning Oil, Otherwise "Stock" For Now,4L80-E,14 Bolt Full Floater,3.73 Gears,NRA RECRUITER,.40 Cal. Beretta Carried Everywhere, "If Guns Cause Crime,Then Mine Are Defective"! Ted Nugent Line ALL Liberals,Illegals,Rino's,ACLU,NAMBLA,ACORN,George Soros and any one else who HATES this Great Country against the wall! P.I Member # 13

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    let us know. we all have hit this headache before

  8. #8
    Registered User bison's Avatar
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    Quote Originally Posted by MAGNUM SERVICES View Post
    Breather hoses, front and rear are new with new caps on them! Leaving the seal protrude a little bit has never been suggested! I'll give it a try as all it could do is leak too!
    did you/they check the axle housing bolt orifice
    98 GMC 2500 HD 6.5 F auto ext 4x4 engine rebuild at 268.000 km,Provent Oil seperator,Vacpump deleted,TM,all gauges,5th wheel.currently at 307.000 km
    95 GMC 2500 6.5 F auto ext sh bx 4x4 ,relocated PMD,OPS,extra glow and aux LP manual switch.In cab fuel gauge.CDR vented at 307.000 km to the atmosfeer.presently 405.000 km
    Wife's d dr.Soon to have pyro,boost,chip and TM
    89 GMC 2500 6.2 auto ext 4x4 relocated OPS 700.000+ KM denoted to ranch duty.
    95 chevy 2500 6.5 F st ext .parts truck .
    2 spare 6.5 F blocks,
    1 is a powerup project, the only 506 block in existence with no outer main cap bolt holes.

  9. #9
    Moderator durallymax's Avatar
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    I had this headache on our 02. Replaced it 3 times within 1,000 miles. Had somebody else give it a shot and it hasnt leaked since, not sure what they did different.

    Are you using the special tool and torqueing to 40lbs the backing it off and torquing to 0lbs??

    Dont quote me on the 40lbs but i believe its conrrect.

  10. #10
    Intelligence Guided By Experience MAGNUM SERVICES's Avatar
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    I have checked the orifice on both axles and they are clear and use the axle nut tool and follow the books specs!
    1996 Sierra 2500,4X4,8600 GVW,"F" Engine,PMD With #9 Resistor Mounted Under Front Bumper using Extension Cable purchased from Burning Oil, Otherwise "Stock" For Now,4L80-E,14 Bolt Full Floater,3.73 Gears,NRA RECRUITER,.40 Cal. Beretta Carried Everywhere, "If Guns Cause Crime,Then Mine Are Defective"! Ted Nugent Line ALL Liberals,Illegals,Rino's,ACLU,NAMBLA,ACORN,George Soros and any one else who HATES this Great Country against the wall! P.I Member # 13

  11. #11
    Registered User bison's Avatar
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    have a good look on bottom of the the axle stub where the inner brg race seats and the seal rides ,both could be worn in from use there and bring the seal contact surface out of line,this causes less seal contact at the top of the axle and to much at the bottom,wont take long for the seal to wear out.
    98 GMC 2500 HD 6.5 F auto ext 4x4 engine rebuild at 268.000 km,Provent Oil seperator,Vacpump deleted,TM,all gauges,5th wheel.currently at 307.000 km
    95 GMC 2500 6.5 F auto ext sh bx 4x4 ,relocated PMD,OPS,extra glow and aux LP manual switch.In cab fuel gauge.CDR vented at 307.000 km to the atmosfeer.presently 405.000 km
    Wife's d dr.Soon to have pyro,boost,chip and TM
    89 GMC 2500 6.2 auto ext 4x4 relocated OPS 700.000+ KM denoted to ranch duty.
    95 chevy 2500 6.5 F st ext .parts truck .
    2 spare 6.5 F blocks,
    1 is a powerup project, the only 506 block in existence with no outer main cap bolt holes.

  12. #12
    Well it hits on 7 of 8... WarWagon's Avatar
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    Are the old seals overheating from brakes dragging? Possible worn bearings allowing too much movement?

    I would look really hard at the old seals rather than just tossing them. Their failure mode may answer where the problem is.
    Not enough room in sig for all the stuff I have that LeroyDiesel.com sells.

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  13. #13

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    Is this what wastes the parking brakes?
    2004 Silverado 2500HD CC/SB LB7 BLACK Leveled on Cognito UCAs, Cognito HD Tie Rods, Moog Pitman & Idler with Cognito Braces, Bilstein 5100's, H2's with 315 Cooper Discoverers, JottoDesk console and computer mount, EFILive on a factory motor (less air resonator), G80 Locker rear end, LED's all around, RED LED Interior, XM hard-mounted to console, PAC OEM Integrated iPod/sat-radio input, PAC OEM line-out sub interface, Pioneer Premier subwooers + JL Audio Amp, Prodigy Brake Controller, Astrostart Remote Start/Alarm, Grover Stuttertone Air Horn, Viair 450 Compressor + tank, Whelen LED's/Strobes/Lighbar, '06 Style towing mirrors, HID Lows/Wig-Wag Highs, and more two-way radios, wiring, amplifiers, switches, knobs, and wires than most small jetliners.

  14. #14
    Intelligence Guided By Experience MAGNUM SERVICES's Avatar
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    Schulte,yes, fluid on the shoes will prevent your parking brake from working! WarWagon, old seals have looked good, no overheating on the brake shoes, they barely get worn before one, or the other or both seals leak! Bearings look good and feel tight when torqued to specs!
    1996 Sierra 2500,4X4,8600 GVW,"F" Engine,PMD With #9 Resistor Mounted Under Front Bumper using Extension Cable purchased from Burning Oil, Otherwise "Stock" For Now,4L80-E,14 Bolt Full Floater,3.73 Gears,NRA RECRUITER,.40 Cal. Beretta Carried Everywhere, "If Guns Cause Crime,Then Mine Are Defective"! Ted Nugent Line ALL Liberals,Illegals,Rino's,ACLU,NAMBLA,ACORN,George Soros and any one else who HATES this Great Country against the wall! P.I Member # 13

  15. #15
    Registered User Golddigger's Avatar
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    Are they leaking around the shaft or the exterior of the seal? If on the outside of the seal try a little silicon around it before you tap it in. Works great on all our semi's. If it is on the shaft, then everyone else has pretty much already mentioned most possibilities.
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