1952 Cub Valve Seat Question

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jakescubs
Posts: 17
Joined: Wed Apr 29, 2020 4:55 pm
Zip Code: 36521
Tractors Owned: 1952 Farmall Cub
1972 Cub Cadet 128
1977 Cub Cadet 1450

Re: 1952 Cub Valve Seat Question

Postby jakescubs » Sun May 03, 2020 7:45 pm

tst wrote: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.
1952 Farmall Cub
1972 Cub Cadet 128
1977 Cub Cadet 1450
Tractors are like vacation days; you can never have too many.
:tractor:

Jim Becker
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Re: 1952 Cub Valve Seat Question

Postby Jim Becker » Sun May 03, 2020 9:09 pm

tst wrote: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
Posts: 17
Joined: Wed Apr 29, 2020 4:55 pm
Zip Code: 36521
Tractors Owned: 1952 Farmall Cub
1972 Cub Cadet 128
1977 Cub Cadet 1450

Re: 1952 Cub Valve Seat Question

Postby jakescubs » Sun May 03, 2020 9:39 pm

Jim Becker wrote:
tst wrote: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.
1952 Farmall Cub
1972 Cub Cadet 128
1977 Cub Cadet 1450
Tractors are like vacation days; you can never have too many.
:tractor:

Eugene
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Re: 1952 Cub Valve Seat Question

Postby Eugene » Sun May 03, 2020 10:42 pm

jakescubs wrote:I’ve already tried 2 different head gaskets, and the leak still continued.
Copper Coat both side of the head gasket before installation?
I have an excuse. CRS.

jakescubs
Posts: 17
Joined: Wed Apr 29, 2020 4:55 pm
Zip Code: 36521
Tractors Owned: 1952 Farmall Cub
1972 Cub Cadet 128
1977 Cub Cadet 1450

Re: 1952 Cub Valve Seat Question

Postby jakescubs » Sun May 03, 2020 10:55 pm

Eugene wrote:
jakescubs wrote: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.
1952 Farmall Cub
1972 Cub Cadet 128
1977 Cub Cadet 1450
Tractors are like vacation days; you can never have too many.
:tractor:

Jim Becker
Team Cub
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Posts: 16440
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Re: 1952 Cub Valve Seat Question

Postby Jim Becker » Mon May 04, 2020 12:26 am

Jim Becker wrote:. . . 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
Posts: 17
Joined: Wed Apr 29, 2020 4:55 pm
Zip Code: 36521
Tractors Owned: 1952 Farmall Cub
1972 Cub Cadet 128
1977 Cub Cadet 1450

Re: 1952 Cub Valve Seat Question

Postby jakescubs » Mon May 04, 2020 12:31 am

Jim Becker wrote:
Jim Becker wrote:. . . 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.
1952 Farmall Cub
1972 Cub Cadet 128
1977 Cub Cadet 1450
Tractors are like vacation days; you can never have too many.
:tractor:

jakescubs
Posts: 17
Joined: Wed Apr 29, 2020 4:55 pm
Zip Code: 36521
Tractors Owned: 1952 Farmall Cub
1972 Cub Cadet 128
1977 Cub Cadet 1450

Re: 1952 Cub Valve Seat Question

Postby jakescubs » Mon May 04, 2020 12:35 am

Also, along with the cylinder head, the top surface of the block was decked and checked for flatness on the original block.
1952 Farmall Cub
1972 Cub Cadet 128
1977 Cub Cadet 1450
Tractors are like vacation days; you can never have too many.
:tractor:

inairam
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Re: 1952 Cub Valve Seat Question

Postby inairam » Mon May 04, 2020 6:38 am

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.
When you only have 9 horsepower you need to know the names of all of the ponies!

bofahs
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Re: 1952 Cub Valve Seat Question

Postby bofahs » Sat May 09, 2020 1:01 pm

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

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


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