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lowdrag
Joined: 10 Apr 2009 Posts: 1585 Location: Le Mans
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Posted: Sun Mar 29, 2020 8:51 am Post subject: |
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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: 7113 Location: Edinburgh
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Posted: Sun Mar 29, 2020 4:58 pm Post subject: |
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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 _________________ http://www.nostalgiatech.co.uk
1939 SS Jaguar 2 1/2 litre saloon |
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Rick Site Admin
Joined: 27 Apr 2005 Posts: 22429 Location: UK
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Posted: Sun Mar 29, 2020 5:41 pm Post subject: |
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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 _________________ Rick - Admin
Home:https://www.oldclassiccar.co.uk
Videos:https://www.youtube.com/user/oldclassiccarRJ/videos
OCC & classic car merchandise (Austin, Ford ++):
https://www.redbubble.com/people/OldClassicCar/shop |
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Penman
Joined: 23 Nov 2007 Posts: 4751 Location: Swindon, Wilts.
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Ray White
Joined: 02 Dec 2014 Posts: 6286 Location: Derby
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Posted: Sun Mar 29, 2020 6:11 pm Post subject: |
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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: 7113 Location: Edinburgh
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Posted: Sun Mar 29, 2020 6:50 pm Post subject: |
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Penman's link has various suggestions for corrosion but mine is not just corrosion It is a substantial build-up of acid salts.
Peter _________________ http://www.nostalgiatech.co.uk
1939 SS Jaguar 2 1/2 litre saloon |
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alanb
Joined: 10 Sep 2012 Posts: 516 Location: Berkshire.
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Posted: Sun Mar 29, 2020 10:30 pm Post subject: |
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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. _________________ old tourer
Morris 8 two seater |
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lowdrag
Joined: 10 Apr 2009 Posts: 1585 Location: Le Mans
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Posted: Mon Mar 30, 2020 5:39 am Post subject: |
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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: 7113 Location: Edinburgh
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Ray White
Joined: 02 Dec 2014 Posts: 6286 Location: Derby
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Posted: Mon Mar 30, 2020 10:45 am Post subject: |
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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: 7113 Location: Edinburgh
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Posted: Mon Mar 30, 2020 11:01 am Post subject: |
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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 _________________ http://www.nostalgiatech.co.uk
1939 SS Jaguar 2 1/2 litre saloon |
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Penman
Joined: 23 Nov 2007 Posts: 4751 Location: Swindon, Wilts.
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Posted: Mon Mar 30, 2020 11:01 am Post subject: |
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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 _________________ Bristols should always come in pairs.
Any 2 from:-
Straight 6
V8 V10 |
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Ray White
Joined: 02 Dec 2014 Posts: 6286 Location: Derby
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Posted: Mon Mar 30, 2020 11:31 am Post subject: |
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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: 7113 Location: Edinburgh
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Posted: Mon Mar 30, 2020 12:30 pm Post subject: |
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Hi Penman,
My posts are lead and the terminals are tin plated brass.
Peter _________________ http://www.nostalgiatech.co.uk
1939 SS Jaguar 2 1/2 litre saloon |
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Penman
Joined: 23 Nov 2007 Posts: 4751 Location: Swindon, Wilts.
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Posted: Mon Mar 30, 2020 1:33 pm Post subject: |
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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. _________________ Bristols should always come in pairs.
Any 2 from:-
Straight 6
V8 V10 |
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