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Joined: Jul 2004
Posts: 67
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Jul 2004
Posts: 67 |
Should I use a sealant or no sealant when I install them on the block of a 1933 Chevy? What is the right way to do it?
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Joined: Jan 2016
Posts: 414 Likes: 8
Backyard Mechanic
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Backyard Mechanic
Joined: Jan 2016
Posts: 414 Likes: 8 |
I have never used any sealant. I have noticed that on the 35 engine at least, the freeze plugs are put in "dome out". I have seen 4 - 35 blocks and they were all that way.
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Joined: May 2002
Posts: 6,149 Likes: 42
ChatMaster - 6,000
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ChatMaster - 6,000
Joined: May 2002
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I put a smear of sealant to fill any small scratches that may have a tendency to leak.
Tony
1938 1/2 ton Hope to drive it before I retire
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Joined: Oct 2009
Posts: 1,294
ChatMaster - 1,000
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ChatMaster - 1,000
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The best thing I have ever used is red lock-tite. Just put a little on the edge of the disc or in the corner of the counter bore. Never had one leak! I use it also on the cup type.
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Joined: May 2002
Posts: 6,149 Likes: 42
ChatMaster - 6,000
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ChatMaster - 6,000
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We have another local product here in Australia that I use that has proved very good, it is a stiff paste. Loctite 517 is a good product as well.
Tony
1938 1/2 ton Hope to drive it before I retire
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Joined: Apr 2006
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ChatMaster - 3,000
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ChatMaster - 3,000
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The machine shop that cleaned and bored Lurch's block used JB Weld to seal in the new freeze plugs. They said that they've been doing this for many years and have not had any leaks come back to the shop.
Dean
Dean 'Rustoholic' Meltz old and ugly is beautiful!
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Joined: Jul 2004
Posts: 67
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Jul 2004
Posts: 67 |
Thanks for the advice. I will take all your suggestions in installing my new freeze out plugs,
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Joined: Jan 2016
Posts: 414 Likes: 8
Backyard Mechanic
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Backyard Mechanic
Joined: Jan 2016
Posts: 414 Likes: 8 |
Doesn't the JB Weld kind of defeat the purpose of the freeze plug popping out so if the engine freezes it won't crack the block?
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Joined: Apr 2006
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ChatMaster - 3,000
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ChatMaster - 3,000
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Good point, Peter. I'll ask the machinist, since I need to go by there anyway.
Dean
Dean 'Rustoholic' Meltz old and ugly is beautiful!
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Joined: Nov 2002
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ChatMaster - 7,000
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The freeze plugs are not there for freeze protection. They are required due to the casting process.
Steve D
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Joined: May 2002
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ChatMaster - 6,000
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From my observations they are dual purpose, initially for the casting process so the sand can be removed but also in later as a soft point when the coolant freezes. I have seen a engine freeze and the plugs remain in place.
Tony
1938 1/2 ton Hope to drive it before I retire
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