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Cracked cylinder head leaking coolant
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1930 McCormick Deering 10/20
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49 Cub with front plow - Location: Kingston Ontario
Cracked cylinder head leaking coolant
Finally decided to adjust fingers and free play thru handhole Had great success and happy to have eleveated the grind Happy story ends as I trace coolant trail to weeping crack in recently rebuilt motor (15 months ) It is not a working tractor just for rides and trailer moves What brand of JB Weld should I use to fill crack after I grind it It appears the rebuilder may have used too long a bolt? Can one bolt be removed to check length or is it best to grind and patch
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Re: Cracked cylinder head leaking coolant
Hi,
The head bolt threads need non hardening sealer put on them as you put the head on the engine.
Without sealer they can leak coolant out the head gasket, or perhaps out from under the bolt head.
People have said on here that they have had leaks from no sealer on the bolt threads.
I don't know if you can see a crack, or coolant is coming out the head gasket, or under the bolt head.
I would dry it off and look closely with a light, and see where the coolant first appears.
The head bolt threads need non hardening sealer put on them as you put the head on the engine.
Without sealer they can leak coolant out the head gasket, or perhaps out from under the bolt head.
People have said on here that they have had leaks from no sealer on the bolt threads.
I don't know if you can see a crack, or coolant is coming out the head gasket, or under the bolt head.
I would dry it off and look closely with a light, and see where the coolant first appears.

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Re: Cracked cylinder head leaking coolant
I can't make anything out from your pic. but Glen's advice, above is good. If it actually is a crack and you want to attempt a J.B. Weld repair, J.B. weld is the brand name.
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- 5+ Years
- Posts: 100
- Joined: Sat May 13, 2017 7:19 pm
- Zip Code: Ont
- Tractors Owned: 48 Cub
51 Cub
1930 McCormick Deering 10/20
49 cub
49 Cub with front plow - Location: Kingston Ontario
Re: Cracked cylinder head leaking coolant
Update to show leak area more clearly
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Re: Cracked cylinder head leaking coolant
I used JB Weld steel stick on mine.
I used a cutoff wheel And a die grinder to open the crack, cleaned it with CRC electrical cleaner solvent spray and pressed the epoxy paste in.
Very satisfied with the results.
I used a cutoff wheel And a die grinder to open the crack, cleaned it with CRC electrical cleaner solvent spray and pressed the epoxy paste in.
Very satisfied with the results.
Quote by Gary Pickeral I like
"If it can cast a shadow, it can be restored"
"If it can cast a shadow, it can be restored"
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- 5+ Years
- Posts: 100
- Joined: Sat May 13, 2017 7:19 pm
- Zip Code: Ont
- Tractors Owned: 48 Cub
51 Cub
1930 McCormick Deering 10/20
49 cub
49 Cub with front plow - Location: Kingston Ontario
Re: Cracked cylinder head leaking coolant
Thanks I will get it drained and start the fix
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