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Old 23-10-09, 06:24 PM   #1
Vintage Magnetos
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Default Hard Limescale Remover

Hi Chaps,I have a Lister D.K I', just started to Restore the Engine, I looked inside the Hopper,there is Lots of Limescale,About 1/4" thick,and were the Three nuts are for then Head.is Completey Cover with Limescale.
I have used a Hammer and Chesial,but i' m on the caution side if i hit it too hit i'll Knackered the head,also i've tried the Kettle descaler no good there.
I'm thinking now if Shot Blasting would get it of.

Any ideas would be Aprecated
Many thanks.

Our what you used in the Past.
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Old 23-10-09, 06:50 PM   #2
wolseley phill
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What about putting paraffin in the hopper?

Last edited by wolseley phill; 24-03-18 at 07:42 AM.
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Old 23-10-09, 07:04 PM   #3
mervyn cloake
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You will have to use an acid, Vinegar, or a weak solution of hydrochloric acid.
Merv.
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Old 23-10-09, 07:57 PM   #4
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I've just removed a huge quantity of scale from the hopper of my BPR. I discovered that although it was a tough hard layer, about 4-5mm thick, it wasn't attached to the iron all that well. I used a metal bar, about 18" long x 1/4" thick. I ground a point on the end and then just chipped away. Each time I broke through the surface I picked off the flakes with my finger nails! A long dull job but it worked.

Martin.
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Old 23-10-09, 08:46 PM   #5
Dave Carter
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Quote:
Originally Posted by Vintage Magnetos View Post
Hi Chaps,I have a Lister D.K I', just started to Restore the Engine, I looked inside the Hopper,there is Lots of Limescale,About 1/4" thick,a...........also i've tried the Kettle descaler no good there......
Any ideas would be Aprecated
Many thanks.

Our what you used in the Past.
I have used "Brick Acid" from the local builders' merchant.
Made a tank and sealed it to the head, joined the inlet and tank together, and left the diluted solution until it stopped bubbling.The acid attacks the scale only. Repeated the proceedure until all the scale had gone.
(Observe H&S instructions.)



Followed by thorough hosing out.

Reaches the parts other ........

Regards,
Dave Carter.
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Old 24-10-09, 07:26 AM   #6
Bolton & Paul
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Hi,

According to my Lister JP3 Work Shop Manual, they recomend mixing up a solution of hydrochloric acid which is virtually the same as brick acid, but I can't remember what strenth the solution has to be or how long you leave it in for. The other thing is if you remove all the lime scale you dont know what you might find underneath it may start leaking.

Regards, Michael.

Last edited by Bolton & Paul; 24-10-09 at 11:02 AM.
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Old 24-10-09, 10:07 AM   #7
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I used hydrocloric acid (spirit of salts) from local hardware, on a cylinder block. I didnt dilute it though because I couldn't immerse it easily.
The sulphur-like smell takes the hair out of your nose, and the next day any shiny surface tool had a fine rust layer on it. So probably immerse it in a diluted mixture outside in the open is best.
Tony.
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Old 24-10-09, 11:09 AM   #8
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Quote:
Originally Posted by Pugdud View Post
I used hydrocloric acid (spirit of salts) from local hardware, on a cylinder block. I didnt dilute it though because I couldn't immerse it easily.
The sulphur-like smell takes the hair out of your nose, and the next day any shiny surface tool had a fine rust layer on it. So probably immerse it in a diluted mixture outside in the open is best.
Tony.
Hi, Best not to breathe the fumes from hydrocloric acid because it can permanently damage your lungs. I never do any soldering in my work shop, because like you said the acid fumes make tools go rusty. You can also buy it from pool chemical shops.

Regards, Michael.
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Old 24-10-09, 07:59 PM   #9
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Hi Chaps.
I bought a Gallon of Brick Acid,I blocked the Drain Hole with a Square Tapered Plug,Then I Done 2 Parts Brick acid,and 1 part water,Left it for 4 hours,Drained the lot out, The acid did'nt remove the Lime scale,So now I put the Brick Acid from the Tub,straight into the hopper,I got to say this stuff is Very Lively in it. Now i'm gonna leave it for a Couple of Hours and see what happens to the Scale.
I've got my Fingers Crossed.

Thankyou to All that Replyed to my thread. Thankyou.
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Old 24-10-09, 09:51 PM   #10
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I think you may find brick acid is already diluted. I think it is 3% hydrochloric in water, which is enough to clean up brick work, If that is the case it would take longer to clean up lime scale and would have to be repeated. Stronger solutions works well on rust scale and does a good job on brass work as well, although to do brass the acid must be clean.
Merv.
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