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cause of the white mung on the batt holdown clamp? #4659106
02/07/18 02:35 PM
02/07/18 02:35 PM
Joined: Jan 2003
Posts: 3,073
Coastal South Carolina
edwardh1 Offline OP
edwardh1  Offline OP
Joined: Jan 2003
Posts: 3,073
Coastal South Carolina
what causes it? batt terminals have the "fuzzy" felt washers on them, no corosion on them and no corrosion on the terminals either,
but the battery hold down clamp that runs across the battery top, where it touches the edge of the top of the battery has the white mung.
where is that coming from?
Thanks.


These products are all new every year?? They are a revolution!!! Razor blades, mens shirts, TVs, wiper blades, gutter guards, hearing aids... according to the ads. But also all new last year
Re: cause of the white mung on the batt holdown clamp? [Re: edwardh1] #4659124
02/07/18 02:56 PM
02/07/18 02:56 PM
Joined: Jun 2003
Posts: 17,343
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,343
Deplorable in apple valley, ca
Acid venting


02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: cause of the white mung on the batt holdown clamp? [Re: edwardh1] #4659125
02/07/18 02:56 PM
02/07/18 02:56 PM
Joined: Jun 2007
Posts: 435
Near Mobile
ffhdriver Offline
ffhdriver  Offline
Joined: Jun 2007
Posts: 435
Near Mobile
Acid fumes leak from battery or battery cap vents.

Re: cause of the white mung on the batt holdown clamp? [Re: edwardh1] #4659146
02/07/18 03:10 PM
02/07/18 03:10 PM
Joined: Mar 2004
Posts: 20,748
Upstate NY
Donald Offline
Donald  Offline
Joined: Mar 2004
Posts: 20,748
Upstate NY
take it off, clean with baking soda, then sand and re-coat with liquid tape or PlasticCoat


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: cause of the white mung on the batt holdown clamp? [Re: edwardh1] #4659193
02/07/18 04:04 PM
02/07/18 04:04 PM
Joined: Mar 2016
Posts: 1,351
toronto
PeterPolyol Offline
PeterPolyol  Offline
Joined: Mar 2016
Posts: 1,351
toronto
Yep, specifically hydrogen and oxygen venting form the cells, corroding metals that it wafts over

Re: cause of the white mung on the batt holdown clamp? [Re: PeterPolyol] #4659227
02/07/18 04:51 PM
02/07/18 04:51 PM
Joined: Jan 2009
Posts: 6,171
New England
gathermewool Offline
gathermewool  Offline
Joined: Jan 2009
Posts: 6,171
New England
I don't know if it helps, but I've begun applying wax to the hold-down bar and applying anti-seize to the threads. I'm hoping this prevents the mess of rust I usually end up with for decade-old vehiles.

Originally Posted By: PeterPolyol
Yep, specifically hydrogen and oxygen venting form the cells, corroding metals that it wafts over


I don't think it's either of those. It's the acid moisture that's carried with the venting gas.

What voltage is your charging system putting out?


'14 Forester XT (Cobb Stage 1)
Edge 0W-40 + FU filter
'15 Legacy 2.5i (OEM Stage -7)
Edge 0W-20 + FU filter
Re: cause of the white mung on the batt holdown clamp? [Re: edwardh1] #4659274
02/07/18 05:36 PM
02/07/18 05:36 PM
Joined: Jan 2003
Posts: 3,073
Coastal South Carolina
edwardh1 Offline OP
edwardh1  Offline OP
Joined: Jan 2003
Posts: 3,073
Coastal South Carolina
DONT KNOW, 3 1/2 YR OLD max wal mart battery, car starts well


These products are all new every year?? They are a revolution!!! Razor blades, mens shirts, TVs, wiper blades, gutter guards, hearing aids... according to the ads. But also all new last year
Re: cause of the white mung on the batt holdown clamp? [Re: edwardh1] #4659329
02/07/18 06:42 PM
02/07/18 06:42 PM
Joined: Jan 2009
Posts: 6,171
New England
gathermewool Offline
gathermewool  Offline
Joined: Jan 2009
Posts: 6,171
New England
WHY ARE YOU YELLING!? crackmeup


'14 Forester XT (Cobb Stage 1)
Edge 0W-40 + FU filter
'15 Legacy 2.5i (OEM Stage -7)
Edge 0W-20 + FU filter
Re: cause of the white mung on the batt holdown clamp? [Re: gathermewool] #4659338
02/07/18 06:53 PM
02/07/18 06:53 PM
Joined: Mar 2004
Posts: 20,748
Upstate NY
Donald Offline
Donald  Offline
Joined: Mar 2004
Posts: 20,748
Upstate NY
Originally Posted By: gathermewool
I don't know if it helps, but I've begun applying wax to the hold-down bar and applying anti-seize to the threads. I'm hoping this prevents the mess of rust I usually end up with for decade-old vehiles.

Originally Posted By: PeterPolyol
Yep, specifically hydrogen and oxygen venting form the cells, corroding metals that it wafts over


I don't think it's either of those. It's the acid moisture that's carried with the venting gas.

What voltage is your charging system putting out?


Right neither hydrogen nor oxygen gas is corrosive. Explosive yes. Its sulfuric acid fumes. Check the charging system.

I remember in the 1950s my Dad would bend a spring or something in the voltage regulator for the engine's generator to adjust the voltage. Before alternators. By the time I was old enough to really understand the workings of an engine they had alternators.


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: cause of the white mung on the batt holdown clamp? [Re: edwardh1] #4659484
02/07/18 09:20 PM
02/07/18 09:20 PM
Joined: Jul 2012
Posts: 2,103
Nashville, TN via Memphis
john_pifer Offline
john_pifer  Offline
Joined: Jul 2012
Posts: 2,103
Nashville, TN via Memphis
Like somebody else said, it's caused by venting/leaking battery acid. Clean with baking soda, and, if you want to go the extra mile, sand the corrosion off. Then coat your hold-down bracket and cable ends with Vaseline or some dielectric grease. That'll prevent it happening again.


16 WRX - PPPP
07 Tacoma V6 - M1 EP 5W-30, Fram Ultra, 10K OCIs, 198K
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