acid build up at terminals

Submitted: Monday, Jan 11, 2010 at 19:18
ThreadID: 75099 Views:2169 Replies:7 FollowUps:5
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Hi guys
I have 92 GQ patrol diesel 4.2. I have dual battery system one deep cycle the other normal crank battery, both lead acid and both under 6 months old.
MY problem is, they both at the terminals get covered by white powder.
In 2 or 3 weeks they get so covered they need cleaning.
There is no leakage a round the terminals, batteries hold their charge, all terminals have the felt washer and I use vaseline on the terminals. The vehicle is used at least 3 times a week and covers about 150k's a week
Has any one any idea what is going on ? Never had this problem before.
Thanks
Al
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Reply By: Member - Allan B (QLD) - Monday, Jan 11, 2010 at 19:27

Monday, Jan 11, 2010 at 19:27
Hi Al, are your felt washers saturated with vaseline?

Some will say that they are not the answer but I have used them for many years and have no problems with terminal deposits or corrosion. Can't explain the physics involved but it works for me somehow. But the washers need to be thoroughly saturated. I actually use wheel-bearing grease. Not to say that vaseline does not work but.

Cheers
Allan

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AnswerID: 398865

Reply By: Member - Kiwi Kia - Monday, Jan 11, 2010 at 20:19

Monday, Jan 11, 2010 at 20:19
What Alan says x 2 :-))

KK
AnswerID: 398874

Reply By: Wilk0 - Monday, Jan 11, 2010 at 20:21

Monday, Jan 11, 2010 at 20:21
I have "cleaned them" over the years with coke then spraying it with battery terminal spray. This generally works for another 6 months or so.

Cheers Wilko
AnswerID: 398876

Reply By: Member - Ed C (QLD) - Monday, Jan 11, 2010 at 20:56

Monday, Jan 11, 2010 at 20:56
Al,
You say that there is no leakage around the terminals, but IMO the white powder indicates that 'gassing' is occurring in this area, indicating a failed terminal post seal...

Possible/probable causes of such failure include (but not necessarily restricted to) the following >>

(A) Tapping the terminal on with a hammer (or other 'blunt instrument'), and /or putting excessive 'side pressure' on the terminal post while tightening the clamp bolt..

(B) Lifting the battery using one of those battery-pick-up-straps which grab the terminal posts, especially so with the larger/heavier batteries..
Since I stopped using this type of 'picker-upper', I've had no problems at all with terminal corrosion..

Dunno if any of the above applies to your situation, but food for thought in any case ;-)

YMMV

Regards, Ed C

:)

Confucius say.....
"He who lie underneath automobile with tool in hand,
....Not necessarily mechanic!!"

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AnswerID: 398884

Follow Up By: Member - Mike DID - Tuesday, Jan 12, 2010 at 15:25

Tuesday, Jan 12, 2010 at 15:25
I agree.

. . . or it's a lousy battery with defective seals around the post.
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FollowupID: 667967

Follow Up By: kiwicol1 - Wednesday, Jan 13, 2010 at 22:27

Wednesday, Jan 13, 2010 at 22:27
also agree, have seen many battery suppliers fit a battery then hammer down a tight fitting terminal, doesnt take much to break that seal specially on a cheaper battery. Col
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FollowupID: 668252

Reply By: Hairs & Fysh (NSW) - Monday, Jan 11, 2010 at 20:58

Monday, Jan 11, 2010 at 20:58
Hi Al,
I've never had that problem, really I haven't. I've seen it often enough and really thick on some batteries.
My engine bay gets truck washed each time I wash the vehicle, then gets a good spray of WD40. Especially the wire harness.
The old girl gets a tub and polish about every month, depending on how dirty she gets.
Maybe that has something to do with, don't know. My dad use to put a blackish thick paint-able muck on his terminals, he reckon it worked. Can't remember what it was called.


AnswerID: 398885

Reply By: Member - Royce- Monday, Jan 11, 2010 at 23:38

Monday, Jan 11, 2010 at 23:38
I think the white stuff is lead sulphate caused by a leak of sulphuric acid from the battery. Nasty stuff if you inhale or otherwise get it into your body.

Vaseline smeared over after rubbing off is the way I have always handled it.
AnswerID: 398919

Reply By: Maîneÿ . . .- Tuesday, Jan 12, 2010 at 09:38

Tuesday, Jan 12, 2010 at 09:38
I believe it's caused by a gas leak, possibly caused by overcharging :(

Maîneÿ . . .
AnswerID: 398950

Follow Up By: kiwicol1 - Wednesday, Jan 13, 2010 at 22:38

Wednesday, Jan 13, 2010 at 22:38
no way a 92 GQ could over charge any form of battery, they only have a 55amp alt fitted and then having 2 batterys in the curcuit???????????. That also goes for any vehicle, no factory fitted alt can over charge any battery fitted to the circuit, unless like the recent landrover it doesnt have the correct battery fitted. Col
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FollowupID: 668256

Follow Up By: Maîneÿ . . .- Wednesday, Jan 13, 2010 at 22:52

Wednesday, Jan 13, 2010 at 22:52
col,
If there was a fault somewhere could it then overcharge ??

Maîneÿ . . .
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FollowupID: 668259

Follow Up By: kiwicol1 - Wednesday, Jan 13, 2010 at 23:01

Wednesday, Jan 13, 2010 at 23:01
Fault like what to over charge at my guess to large batterys, when the vehicle is only doing 150ks a week. Col
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FollowupID: 668260

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