1952 Cub Valve Seat Question

[jakescubs]

I think the inside crack would give you grief, when the engine gets hot it will expand

The crack on the inside allowed antifreeze to seep out between the head gasket and engine block. The freeze crack on the side of the block didn’t cause many issues, all I had to do was cold weld it to keep water from seeping out.

[Jim Becker]

I think the inside crack would give you grief, when the engine gets hot it will expand

It could. But in this case the only real cost of trying it is a set of gaskets. All the rest of the expense is sunk. I think I can see crack extending through the next piece of webbing above the right box. Even so, it only looks like a water jacket failure.

[jakescubs]

I think the inside crack would give you grief, when the engine gets hot it will expand

It could. But in this case the only real cost of trying it is a set of gaskets. All the rest of the expense is sunk. I think I can see crack extending through the next piece of webbing above the right box. Even so, it only looks like a water jacket failure.

I’ve already tried 2 different head gaskets, and the leak still continued. I also had the cylinder head checked for warpage and milled flat when the engine was at the machine shop.

[Eugene]

I’ve already tried 2 different head gaskets, and the leak still continued.

Copper Coat both side of the head gasket before installation?

[jakescubs]

I’ve already tried 2 different head gaskets, and the leak still continued.

Copper Coat both side of the head gasket before installation?

I did that as well. I also coated the head bolt threads in Indian Head gasket shellac.

[Jim Becker]

. . . Given all you already have invested in the block, I'd check the top for flatness, correct that if needed, . . .

What is the status on this?

[jakescubs]

. . . Given all you already have invested in the block, I'd check the top for flatness, correct that if needed, . . .

What is the status on this?

The ebay block is still at the machine shop. He said the block is gonna need new valve guides as well, so I’m gonna bring him the new valve guides I put in the original block. The guides only have a few hours on them, so they should be pretty much like new. I’m also gonna bring the original block up to my machinist to see if there is anything that can be done to save it.

[jakescubs]

Also, along with the cylinder head, the top surface of the block was decked and checked for flatness on the original block.

[inairam]

Jake, I would consider letting the machine shop purchase all of the parts and install them. That way there is no questions about who did what if there is another issue. The solid engine machine should should have magnafluxed the block before they started. The whole purpose of magnaflux is to see cracks you can not see with the naked eye.

Before you spend another $1000 -$1500 ( parts and machining) and more of your time, I would also consider looking for a different shop. I have used this web site for a trade association to find engine rebuilder near me https://www.aera.org/member-locator.html. I brought a head to one. They magnafluxed it before they machined it flat.

[bofahs]

https://www.youtube.com/watch?v=WtbaK9vsBoE&t=793s

At 8:40 in this video, she takes the valve guides out. Pretty simple.