Hi,
I'm currently in the process of having my engine rebuild and run into a problem, the problem being I'm missing a coolant gallery Bung at the rear of the block.
I cant find anyway where to buy one new.

Does anyone have a broken block and no longer needs this bung ? if you do could you drop me a PM please !!!

 

https://www.lingshondaparts.com/hond...6&block_05=hcr
is it the same as 10 &13 ? 28mm?

 

Do you mean a "core plug"? the type that's hammered in, if so many motor factors will have an assortment of sizes to choose from(at least my mate did) or is it a screw plug with an allen key fitting, if the latter from a good engineering agency supplier or maybe plumbing supplies?

 

It's a 28mm threaded bolt and you won't find it in any manual or parts diagram, it's the oil gallery behind there and not coolant.
I replaced the washer on mine with 90401-PR4-000 intended for the drain plug noodles linked to, I would say that bolt should fit as well as long as it's not protruding to much and hits the flywheel.
The stock one has an allen head and the coolant drain plug is a hex head.
Here is a picture on my plug and washer

 

That's not a bad shout Flanders, will have to try the drain plug see if it's the thread pitch is correct, then get the head of the bolt milled down to fit if it dosen't clear the flywheel.
Thanks for the suggestion!