coolant drain plug

[Robbie224]

Is the gold colour bolt the coolant drain plug ?
Its a 71 A series engine.

[Jason]

Yes, the one with a copper sealing washer. When I removed mine from my MK1 850 no coolant come out as the aperture in the block behind the blanking plug had corroded up. When the engine was removed at a later date I drilled out the corrosion, can’t recall the original diameter of the hole in the block behind the blanking plug though.

[Robbie224]

Thank you

[AndyPen]

Just to say mine was half full of corrosion but it came out reasonably easily, especially with a few flushes after digging away at it.

There is a corner in the flow there, so sediment doesn't tend to build up too deeply.

[Catmint]

seem to recall a 6mm (ish) drill bit comes in handy to scrape the crud out in situ