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What did you do to your car today?
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lowdrag



Joined: 10 Apr 2009
Posts: 1284
Location: Le Mans

PostPosted: Sun Mar 29, 2020 8:51 am    Post subject: Reply with quote

Oh, memories! "The first pull of the starter". And the clothes peg to keep the choke out, and remembering to keep your thumb on the same side as your fingers on the starting handle and, and..................
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peter scott



Joined: 18 Dec 2007
Posts: 6174
Location: Edinburgh

PostPosted: Sun Mar 29, 2020 4:58 pm    Post subject: Reply with quote

Ran the SS up to temperature today and slipped the clutch in first gear to keep it free. Unfortunately the positive terminal of my nice new battery was encrusted with salts so I took it off removed the pinch bolt etc and cleaned it with Domestos then slobbered graphite grease on it and the battery post before reconnecting it.

Why do battery terminals get encrusted? Does this indicate a slight leakage at the post?

Peter
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1939 SS Jaguar 2 litre saloon
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Rick
Site Admin


Joined: 27 Apr 2005
Posts: 21004
Location: North-west UK

PostPosted: Sun Mar 29, 2020 5:41 pm    Post subject: Reply with quote

peter scott wrote:
Ran the SS up to temperature today and slipped the clutch in first gear to keep it free. Unfortunately the positive terminal of my nice new battery was encrusted with salts so I took it off removed the pinch bolt etc and cleaned it with Domestos then slobbered graphite grease on it and the battery post before reconnecting it.

Why do battery terminals get encrusted? Does this indicate a slight leakage at the post?

Peter


I forget the reason, but I had the same with big Dodge so smeared some in-period (1952 pack) "No-Crode" over the offending terminal, and its been ok since.

RJ
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Various 1920s-1960s - Austin, Morris, Commer, Dodge etc.
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Penman



Joined: 23 Nov 2007
Posts: 4123
Location: Lancashire

PostPosted: Sun Mar 29, 2020 5:47 pm    Post subject: Reply with quote

Hi
https://mechanics.stackexchange.com/questions/15120/what-causes-battery-terminal-corrosion[/quote]
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Ray White



Joined: 02 Dec 2014
Posts: 3282
Location: Derby

PostPosted: Sun Mar 29, 2020 6:11 pm    Post subject: Reply with quote

I was always instructed not to use grease on battery terminals. Petroleum jelly is recommended by those in the know.
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peter scott



Joined: 18 Dec 2007
Posts: 6174
Location: Edinburgh

PostPosted: Sun Mar 29, 2020 6:50 pm    Post subject: Reply with quote

Penman's link has various suggestions for corrosion but mine is not just corrosion It is a substantial build-up of acid salts.

Peter
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alanb



Joined: 10 Sep 2012
Posts: 428
Location: Berkshire.

PostPosted: Sun Mar 29, 2020 10:30 pm    Post subject: Reply with quote

My dad spent most of his working life working for a tyre & battery company, his way of cleaning battery terminal's encrusted with deposits was to pour boiling water over them it quickly clears the deposits and leaves the clamp and terminals spotlessly clean ready to be coated in petroleum jelly.
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lowdrag



Joined: 10 Apr 2009
Posts: 1284
Location: Le Mans

PostPosted: Mon Mar 30, 2020 5:39 am    Post subject: Reply with quote

alanb wrote:
My dad spent most of his working life working for a tyre & battery company, his way of cleaning battery terminal's encrusted with deposits was to pour boiling water over them it quickly clears the deposits and leaves the clamp and terminals spotlessly clean ready to be coated in petroleum jelly.


+1 My Dad owned a Ford dealership and that was the method they used.
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peter scott



Joined: 18 Dec 2007
Posts: 6174
Location: Edinburgh

PostPosted: Mon Mar 30, 2020 9:21 am    Post subject: Reply with quote

Thanks for the hot water advice. My question is really whether or not my new battery is faulty? I suspect that acid is able to leak at the point where the terminal passes through the top deck and that this should not happen.

I think this article answers my question:
https://benignblog.com/2013/05/why-battery-terminals-corrode-causes-composition-cleaning-prevention.html

Basically I don't have a sealed battery so I shouldn't expect it not to leak at the terminal and me pouring Domestos over the terminal is a bad idea.

Peter
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Ray White



Joined: 02 Dec 2014
Posts: 3282
Location: Derby

PostPosted: Mon Mar 30, 2020 10:45 am    Post subject: Reply with quote

Peter, I notice that they say use petroleum jelly or grease. My first job was in a tyre and battery centre and being the junior I was given the grotty jobs. One of the things we had to do was clean the customer's batteries before charging. That meant pouring boiling water onto the terminals and making sure there was NO grease on them. It is my understanding that grease is not a good a conductor and may also absorb water.

I expect in reality there is not much difference.
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peter scott



Joined: 18 Dec 2007
Posts: 6174
Location: Edinburgh

PostPosted: Mon Mar 30, 2020 11:01 am    Post subject: Reply with quote

Ray,

I had wondered which type of grease to use. I have plain bearing grease, copper grease and graphite grease and decided to use the latter but perhaps the copper would have been a better choice??

Peter
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Penman



Joined: 23 Nov 2007
Posts: 4123
Location: Lancashire

PostPosted: Mon Mar 30, 2020 11:01 am    Post subject: Reply with quote

Hi
It is also possible that the corrosion is Galvanic Corrosion due to the difference in the Anodic Index figures of the metals involved.
What are battery post made from?
What are the cable terminals made from?

This is the same phenomenon seen when an Aluminium skin is mounted on a steel framework without adequate insulation or the insulation breaks down over time.

https://en.wikipedia.org/wiki/Galvanic_corrosion
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Bristols should always come in pairs.

Any 2 from:-
Straight 6
V8 V10
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Ray White



Joined: 02 Dec 2014
Posts: 3282
Location: Derby

PostPosted: Mon Mar 30, 2020 11:31 am    Post subject: Reply with quote

peter scott wrote:
Ray,

I had wondered which type of grease to use. I have plain bearing grease, copper grease and graphite grease and decided to use the latter but perhaps the copper would have been a better choice??

Peter


I hadn't thought of copper grease. I would have thought that would be quite conductive.

Old habits die hard and I have always followed the advise to use petroleum jelly (Vaseline). I worked for my Dad and David Cobb and they both always said not to use grease on battery terminals. I also lightly prepare the terminals and clamps with fine sand paper.
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peter scott



Joined: 18 Dec 2007
Posts: 6174
Location: Edinburgh

PostPosted: Mon Mar 30, 2020 12:30 pm    Post subject: Reply with quote

Hi Penman,

My posts are lead and the terminals are tin plated brass.

Peter
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Penman



Joined: 23 Nov 2007
Posts: 4123
Location: Lancashire

PostPosted: Mon Mar 30, 2020 1:33 pm    Post subject: Reply with quote

Hi
Looking at the index (V) chart at the bottom of that wiki page, you will see that Tin Plate and Lead are close to each other, 0.05V (it doesn't mention tinplate brass) BUT Brass and Lead are 0.25V -0.30V apart.
I wonder if thew tin plate is wearing thin in places.
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Any 2 from:-
Straight 6
V8 V10
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