Water Jackets

[charlesp]

The other Charles has asked me to post this. He's experiencing problems once more:

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I think it's time we gave the water jacket some serious thought.

The water jacket is basically 1 cast iron tube inside another with a, 8mm circa gap between them, which is full of a rusty coloured concretion by the time you realise, that the water flow is a problem.
At this point there will be only a couple of small passage ways big enough to permit the dribble your seeing, there will be areas in this rusty tube that are more that 25mm from any of the coolant.

I have descaled 1 almost solid water jacket using Novamax made by Henkel that is used for descaling saltwater injection pipes in the North sea oil fields.
I made up the 5% solution as instructed & supported the cylinder with head installed, over a bucket containing solution & a submersible plastic fish tank pump, heated by a light bulb underneath, I pumped the solution up the water delivery & the return came from the tell tale.
It took 6 weeks + to clear the water jacket & used about 4 lots of solution which turned the colour of Squid ink.
When I removed the head no concretion could be seen, but the cast iron was very black but with a very pronounced "sand blasted woodgrain effect" with heaps of clean surface area for the next batch of corrosion.

So I came to the conclusion that to descale a Seagull with a removable cylinder head the long electrical screwdrive & hammer was the best & quickest way, but for a 102 or earlier, this might be the only way.

The other Charles & I have been discussing using ultrasonic cleaners after the series of posts (another thread) if anyone out there has one big enough to submerge a century or 102 cylinder could they please give it a try & let us know what results they obtain if any.

[steve66]

Hi Charles. I have a 102 block,unfortunately concretion wise its not too bad.I will give it an hour or two in my ultrasonic cleaner and see what it will do.Personally i dont think it will shift stubborn deposits but we will give it a go.Incidentally if anyone else wants anything cleaning at the same time let me know,its plenty big enough.
Steve

[Collector Inspector]

When all cleaned out, spiffy and shiny, Anode Anode Anode and Anode....

A bit of zinc that can get wet does a super job.

Even works when motor is stored away off season.

Just a bit of sheet Zinc under a bolt head is all it needs.

Regards

C.I.