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Flushing Cooling System

Why don't red engines have a drain tap on the block? I can't find one on my 138 red. How are you supposed to effectively drain and flush the cooling system without a tap on the block?

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Not sure on the 138, but being a red block, I would assume it would be the same.

There is a bolt on the block, on the welsh plug side, just below the starter bracket bolt.

Check it out [http://holdenpaedia....|HERE] in the Holdenpaedia.

Not quite a tap, but can help if your trying to give the block a good flush.

If you want to get much more serious than that, but don't want to pull the motor out, then you could knock out a welsh plug or two, give it a good clean, then just replace those plugs?

If any of your plugs are still steel and not brass/copper, then this may not be a bad idea to do anyway.

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Good day, Wheelnut.
About your comments re the copper/brass welch plugs. I've always made sure the easiest welch plug to remove is a steel one while the rest are copper/brass. This is based on the position of the metals in the electro-chemical series, such that the steel is more likely to "corrode" than the copper/brass. It is probably better for the steel welch plug to rust than some other and more expensive part of the engine.
Just my two bob's worth.
Happy New Year,
Richard.

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While I can understand your thinking on using one of the plugs as a sacrificial anode, I can also see potential problems with that corrosion blocking the cooling system.

I would think the aim with the availability of good quality rust inhibitors nowadays, would be to minimise any corrosion as much as possible.

Although, I do think it is a good idea to put more earth straps in the system to help with this problem.

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