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Just wondering: what causes leaks? #4603923
12/14/17 10:16 PM
12/14/17 10:16 PM
Joined: Nov 2016
Posts: 1,303
WI
HoosierJeeper Offline OP
HoosierJeeper  Offline OP

Joined: Nov 2016
Posts: 1,303
WI
Random thought of that day...take pinion seals or transfer case seals or oil seals. What conditions make them leak, or is it all random (barring damaging during a repair etc)? I.E. is it all age or all mileage? Does city driving cause more leaks where things don't get up to temp? Or highway trips?


Or am I just talking nonsense and trying to waste bandwidth? LOL


15 Jeep KL Limited V6: Formula Shell 5W20
07 LR3 SE V8: Maxlife 5W30
05 Jeep KJ Limited: PHM 5W30
96 Jeep XJ Country: STP HM 5W30 (winter)
Re: Just wondering: what causes leaks? [Re: HoosierJeeper] #4603978
12/14/17 11:27 PM
12/14/17 11:27 PM
Joined: Nov 2016
Posts: 395
Texas
BalticBob Offline
BalticBob  Offline

Joined: Nov 2016
Posts: 395
Texas
all of the above.......plus manufacturing defects and quality control at the factory or repair shop.

Re: Just wondering: what causes leaks? [Re: HoosierJeeper] #4603993
12/14/17 11:56 PM
12/14/17 11:56 PM
Joined: Nov 2016
Posts: 1,303
WI
HoosierJeeper Offline OP
HoosierJeeper  Offline OP

Joined: Nov 2016
Posts: 1,303
WI
So basically...if it's gonna leak it'll leak no matter how you treat it?


15 Jeep KL Limited V6: Formula Shell 5W20
07 LR3 SE V8: Maxlife 5W30
05 Jeep KJ Limited: PHM 5W30
96 Jeep XJ Country: STP HM 5W30 (winter)
Re: Just wondering: what causes leaks? [Re: HoosierJeeper] #4604020
12/15/17 01:00 AM
12/15/17 01:00 AM
Joined: Nov 2008
Posts: 9,596
Phoenix
dishdude Offline
dishdude  Offline

Joined: Nov 2008
Posts: 9,596
Phoenix
Originally Posted By: HoosierJeeper
So basically...if it's gonna leak it'll leak no matter how you treat it?


I would agree with that. I think age is going to be the biggest contributing factor.


2018 Challenger SRT 392 PUP 0w-40 Wix 57899XP
2018 GTI
Re: Just wondering: what causes leaks? [Re: HoosierJeeper] #4604077
12/15/17 05:31 AM
12/15/17 05:31 AM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
Merkava_4  Offline

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Clovis, CA
Leaks are caused by seals that are either shrinking, losing their pliability, or not bonding to their mating surfaces. The words 'pliability' and 'conformability' can be interchanged when it comes to seals and gaskets.

Re: Just wondering: what causes leaks? [Re: HoosierJeeper] #4604163
12/15/17 08:57 AM
12/15/17 08:57 AM
Joined: May 2012
Posts: 2,446
The land of USA-made Subies!
SubieRubyRoo Online happy
SubieRubyRoo  Online Happy

Joined: May 2012
Posts: 2,446
The land of USA-made Subies!
Pinion/transfer case, the round seals... almost always have some kind of damage to them. Rocks flying up, suffering bad vibration from a shot u-joint, damaged during installation...

Gaskets, if they are the o-ring style are almost always damage or poor installation. Cork gaskets are shrinkage. If you keep clean, healthy fluids in each piece of machinery and prevent physical damage, nearly every seal or gasket will live a long, happy life.

Re: Just wondering: what causes leaks? [Re: Merkava_4] #4604174
12/15/17 09:05 AM
12/15/17 09:05 AM
Joined: Apr 2010
Posts: 4,739
Storrs, Connecticut
jeepman3071 Offline
jeepman3071  Offline

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Storrs, Connecticut
Originally Posted By: Merkava_4
Leaks are caused by seals that are either shrinking, losing their pliability, or not bonding to their mating surfaces. The words 'pliability' and 'conformability' can be interchanged when it comes to seals and gaskets.


This.

I think a lot of it has to do with heat cycles, and how resistant the gasket material is to those cycles.


2000 Jeep Cherokee 4.0L (181k) - Pennzoil 10w30, Napa Gold 1516, Magnefine trans filter
2009 BMW 328i (38k) - Castrol Edge Euro 0w40, MANN HU816X
Re: Just wondering: what causes leaks? [Re: HoosierJeeper] #4604211
12/15/17 09:30 AM
12/15/17 09:30 AM
Joined: Apr 2009
Posts: 273
Reno, Nevada
Langanobob Offline
Langanobob  Offline

Joined: Apr 2009
Posts: 273
Reno, Nevada
A lot of the seals Ive changed have been high mileage and completely worn out, some with the spring riding directly on the shaft and damaging it. Some seal leaks are due to loose bearings that allow too much shaft motion, that seems to sometimes be the case with pinion and axle bearings. Sometimes a plugged housing vent will cause a pressure buildup that pushes fluid past the seal.

Only know of one seal that leaked due to a manufacturing defect. About city driving vs highway, just a guess but Id say that the total number of shaft revolutions is a big part of the leak equation, so highway driving wears seals faster. But no facts to back that up.

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