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 » Thu Apr 30, 2020 6:14 pm

He did not offer compensation, but I will talk to him about it next time I go to his shop.
1952 Farmall Cub
1972 Cub Cadet 128
1977 Cub Cadet 1450
Tractors are like vacation days; you can never have too many.
:tractor:

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Glen
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Re: 1952 Cub Valve Seat Question

Postby Glen » Thu Apr 30, 2020 6:25 pm

Hi,
I don't see how one of the inserts could back out, if all you did was screw the head bolts into the holes and tighten them.
If the threads on the inserts are right hand, like the head bolts, the inserts would be turning down into the block, turning them clockwise. :)

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 » Thu Apr 30, 2020 6:48 pm

Glen wrote:Hi,
I don't see how one of the inserts could back out, if all you did was screw the head bolts into the holes and tighten them.
If the threads on the inserts are right hand, like the head bolts, the inserts would be turning down into the block, turning them clockwise. :)


That confused me too, I don't see how the insert could have backed out.
1952 Farmall Cub
1972 Cub Cadet 128
1977 Cub Cadet 1450
Tractors are like vacation days; you can never have too many.
:tractor:

Crimson Tim
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"Paul", 1951 Cub
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So far, Paul and Ringo have arrived. John and George were supposed to follow ages ago, but apparently have gone awol. Long story.
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Re: 1952 Cub Valve Seat Question

Postby Crimson Tim » Thu Apr 30, 2020 6:50 pm

jakescubs wrote:
Glen wrote:Hi,
I don't see how one of the inserts could back out, if all you did was screw the head bolts into the holes and tighten them.
If the threads on the inserts are right hand, like the head bolts, the inserts would be turning down into the block, turning them clockwise. :)


That confused me too, I don't see how the insert could have backed out.


The only part about that that makes sense to me is if it backed out *as you were removing the head bolt*.

Got any pics of that area, showing the crack?

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 » Thu Apr 30, 2020 6:53 pm

I don’t have any pics of it right now, but I will take some when I get home. The crack runs from the insert to a cooling passage and on the outside of the block next to the breather tube hole.
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 » Fri May 01, 2020 12:08 am

jakescubs wrote:
Yes, he said the crack was most likely caused by the threaded head bolt hole insert backing out of the block.

That explanation doesn't make sense to me. If he said PULLED out of the block, maybe. But BACKING out suggests it unscrewed. I don't see how that could happen.

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 » Fri May 01, 2020 12:12 am

I am gonna go take a closer look at the insert tomorrow. I’ll also get some pictures of the crack too.
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 » Sun May 03, 2020 3:19 pm

Heres the picture of the insert and the two cracks.
IMG_2792.jpeg
1952 Farmall Cub
1972 Cub Cadet 128
1977 Cub Cadet 1450
Tractors are like vacation days; you can never have too many.
:tractor:

tst
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Re: 1952 Cub Valve Seat Question

Postby tst » Sun May 03, 2020 5:24 pm

that is a freeze crack on the outside of the block

Bob McCarty
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Re: 1952 Cub Valve Seat Question

Postby Bob McCarty » Sun May 03, 2020 5:27 pm

Was the block magnafluxed before the rebuild?
"We don't need to think more,
we need to think differently."
-Albert Einstein

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 6:27 pm

Bob McCarty wrote:Was the block magnafluxed before the rebuild?


I checked my invoice from the machine shop, and no where did it mention that he magnafluxed the block. But, I did do a thorough check of the block before I sent it off and I do not remember seeing a crack in that area. This tractor also came from an area where it rarely, if never gets below freezing during the winter. Maybe the insert was too close to the edge of the block, and the casting around it was too thin so it cracked. What do you think?
1952 Farmall Cub
1972 Cub Cadet 128
1977 Cub Cadet 1450
Tractors are like vacation days; you can never have too many.
:tractor:

tst
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Re: 1952 Cub Valve Seat Question

Postby tst » Sun May 03, 2020 7:14 pm

to install the insert the hole is drilled to size, tapped and new insert threaded in, do not see how that could break the casting, I have seen several with the same crack in that area of the block due to freezing

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 7:18 pm

tst wrote:to install the insert the hole is drilled to size, tapped and new insert threaded in, do not see how that could break the casting, I have seen several with the same crack in that area of the block due to freezing

You’re right, I must have just never noticed the crack.
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 7:36 pm

Looks like a freeze crack to me and not a new one. It doesn't look that bad either. Given all you already have invested in the block, I'd check the top for flatness, correct that if needed, then use it.

tst
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Re: 1952 Cub Valve Seat Question

Postby tst » Sun May 03, 2020 7:41 pm

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


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