Thread: Welch plug has me stumped.

What came out was it a dished or cup welsh plug the photo of the block looks like it takes a dished type , the plug sits against the sholder then you hit the center with a hammer to expand it.my parts book says it should be 1 1/2" & looks like a dish by the photo in the parts book. Be worned if they give you a metric one & not imperial it could be just under size & may not expand enough. Brother & I have booth had trouble with his Jag & my MG were once the radiator gets to pressure the plugs pop out untill we started buying them at swaps & measuring them before we bought them , didn't have a problem after that.

Looks like it should be a dished type welch plug. It sits on that ledge in the bck of the head concave out. Put a little sealer on it and place it on the ledge and one hit with a hammer in the middle and that should spread it and hold it in place

Thanks guys - I’ll have another look in the morning. The one I ordered was 1 1/2” USA made and brass, but I’ll ask about a dish type.
Does anyone else have one in the rear of the motor?

The one on the rear of my motor is a threaded type. Some are dish type some are cup type

That doesn’t seem enough of a shoulder to me for a dish type plug, I would be trying a 1&3/8 cup type first.

I now see that British Auto Parts lists the following as the options for the rear welsh plug
15/16”
1 1/2”
1 3/8”
1 3/4”
So whitey56 I think you may we’ll be on the money with the 1 3/8”
I’ll let you know how I go.
Thanks once again everyone.

Whitey56 - spot on. I got the 1 3/8” cup welsh plug and it fitted perfectly. Thanks Mate.

Pics, or it didnt happen