Water Jacket Flush

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Ghostkls
Posts: 117
Joined: Mon Apr 08, 2013 7:40 am
Location: East London, South Africa

Water Jacket Flush

Post by Ghostkls » Mon Sep 15, 2014 7:30 am

I was working on my RX7 yesterday and was horrified by the rubbish in the cooling system....

Coolant has been replaced regularly but this is the first time I have removed the pump to see what was hiding away and have found massive amounts of white crystals which seem to be blocking up everything - at least not much rust....

Anyone got any tip/ideas to flush out the block?

TOOL
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Joined: Thu Sep 01, 2011 10:30 am
Location: Var, France (ex NZ, ex UK)

Re: Water Jacket Flush

Post by TOOL » Mon Sep 15, 2014 8:39 am

It's a strip the motor and rebuild job unfortunately.

It'll look like this on the inside:

Image

This one's not too bad. but I've seen them gummed up all the way round the bottom galleries.
Back in sunny France

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Ghostkls
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Location: East London, South Africa

Re: Water Jacket Flush

Post by Ghostkls » Mon Sep 15, 2014 8:44 am

I had a feeling someone was going to tell me that....

First step, sort out the Rad and see how the temps and that look from there as the motor is running Sweet at the moment.

User Banned

Re: Water Jacket Flush

Post by User Banned » Wed Sep 17, 2014 10:10 am

What causes this? Will this happen if always using green glycol based coolant and demineralised water ( as i plan to do)? Also, Im a little confused as to how to whether to earth the radiator.

codge
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Location: South Yorks.

Re: Water Jacket Flush

Post by codge » Wed Sep 17, 2014 4:29 pm

Well I'd say the rad's earthed already via it's fixing bolts. Never had occasion to think about earthing it......

I use only 'Blucol' coolant, available here, the glycol based blue stuff not the more modern long lasting stuff (which is said to damage classics).
At coolant changes as I've said previously, my old coolant is still clear blue. Also I use tap water, tut tut.

I change every 2/3 years....I think that's the best preventative there is.

spoddy
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Re: Water Jacket Flush

Post by spoddy » Wed Sep 17, 2014 8:08 pm

with my 92 mx3 its 50/50 coolant/water, so i assume it would be something similar with the fb?

codge
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Re: Water Jacket Flush

Post by codge » Wed Sep 17, 2014 8:16 pm

40/60% coolant/water, from memory,

Protects down to -30 centigrade or thereabouts.

spoddy
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Re: Water Jacket Flush

Post by spoddy » Wed Sep 17, 2014 8:25 pm

i got the rx8 coolant flushed a few years back, might do it again sometime in the near future.
i top'd up with distilled water, ie stuff in supermarket for use in batteries etc.

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ian65
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Re: Water Jacket Flush

Post by ian65 » Wed Sep 17, 2014 8:30 pm

Ghostkls wrote:I was working on my RX7 yesterday and was horrified by the rubbish in the cooling system....

Coolant has been replaced regularly but this is the first time I have removed the pump to see what was hiding away and have found massive amounts of white crystals which seem to be blocking up everything - at least not much rust....

Anyone got any tip/ideas to flush out the block?
Keith, try some marine engine flush....... the cooling systems of engines running in saltwater often rust up and suffer build ups of salt crystals if they don't get flushed out with fresh water..... there are numerous different specialist marine flushes available.

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Ghostkls
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Joined: Mon Apr 08, 2013 7:40 am
Location: East London, South Africa

Re: Water Jacket Flush

Post by Ghostkls » Wed Sep 17, 2014 8:41 pm

Thanks Ian. Tried normal engine flush and a lot of dirt came out the system but the white crystals did not seem to break down at all.

I will post a pic of the tubes in the radiator, most of which had completely been blocked by this crystal build up, even the thermostat was covered.

Hopefully the marine flush helps....

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