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New Petcock #2699870
09/22/19 02:05 PM
09/22/19 02:05 PM
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Michigan
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BlueRacer69 Offline OP
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Does it need some sort of sealer on it before being screwed into the radiator? If so, what? Thank you. wrench

Re: New Petcock [Re: BlueRacer69] #2699872
09/22/19 02:08 PM
09/22/19 02:08 PM
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Sniper Offline
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Just put a new one on my 51 Cambridge. No sealant needed.

Re: New Petcock [Re: Sniper] #2699908
09/22/19 05:30 PM
09/22/19 05:30 PM
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Fulton County, PA
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CMcAllister Offline
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Pipe thread? Always a teflon pipe tape or paste.


If the results don't match the theory, change the theory.
Re: New Petcock [Re: CMcAllister] #2699918
09/22/19 06:28 PM
09/22/19 06:28 PM
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Omaha Ne
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TJP Offline
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Originally Posted by CMcAllister
Pipe thread? Always a teflon pipe tape or paste.


iagree

Re: New Petcock [Re: TJP] #2699996
09/22/19 10:48 PM
09/22/19 10:48 PM
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So Near, Yet So Far
topside Offline
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If it doesn't have to be restoration-accurate, I like the ones with a little hose bib extension.
If you add a short length of hose to the bib, the coolant drains past the lower radiator support.

Re: New Petcock [Re: topside] #2700081
09/23/19 10:43 AM
09/23/19 10:43 AM
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Originally Posted by topside
If it doesn't have to be restoration-accurate, I like the ones with a little hose bib extension.
If you add a short length of hose to the bib, the coolant drains past the lower radiator support.


I recently had 3 of those from different sources in which the 'wing" used for tightening and loosening just spun. the last one was front NAPA at $12.00, more than twice the price of the other 2. BTW, They appeared identical, mad

Re: New Petcock [Re: TJP] #2700096
09/23/19 11:14 AM
09/23/19 11:14 AM
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Sniper Offline
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Originally Posted by TJP
Originally Posted by topside
If it doesn't have to be restoration-accurate, I like the ones with a little hose bib extension.
If you add a short length of hose to the bib, the coolant drains past the lower radiator support.


I recently had 3 of those from different sources in which the 'wing" used for tightening and loosening just spun. the last one was front NAPA at $12.00, more than twice the price of the other 2. BTW, They appeared identical, mad


Ran into the same thing from my NAPA part as well, had to use a punch in the hole to peen the crimp down tighter.

Re: New Petcock [Re: topside] #2700108
09/23/19 11:47 AM
09/23/19 11:47 AM
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BlueRacer69 Offline OP
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Hello again. Okay, I've have 1 member who said no sealant needed and 2 members who say use some sort of a sealant. Anyone else care to comment? Thanks..

Re: New Petcock [Re: BlueRacer69] #2700115
09/23/19 12:11 PM
09/23/19 12:11 PM
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topside Offline
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Yes on sealant for pip threads, I prefer the paste.
As for the faulty petcocks, I haven't had that problem, but they're a lot cheaper than $12 at my local hardware store.

Re: New Petcock [Re: topside] #2700313
09/24/19 12:53 AM
09/24/19 12:53 AM
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Brass on brass pipe thread low pressure; threads would distort enough to seal a low pressure system. Put any type sealant on it & you won't have to tighten that much to prevent even seepage.

Re: New Petcock [Re: PhillyRag] #2700552
09/24/19 06:52 PM
09/24/19 06:52 PM
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The ones I've bought usually already had some sort of sealant on it.

The last time I needed one was a few years ago and every one I tried had the problem with the wing that spun before it was tight. I ended up buying a compressor drain valve that looked the same but made better for about the same price. No problems since.

Re: New Petcock [Re: BlueRacer69] #2700777
09/25/19 01:13 PM
09/25/19 01:13 PM
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Omaha, Nebraska
Scott Carl Offline
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I'm going to s*it on both sides of the fence; I've done it both ways in many situations. Brass on brass and about any other type including a steel motorcycle tank, the brass (or, in the case of aluminum, the Al threads) will deform just enough to seal if I was too cheap to buy tape or dope. With the addition of sealant, its like very inexpensive assurance.

Last edited by Scott Carl; 09/25/19 01:14 PM.
Re: New Petcock [Re: Scott Carl] #2700794
09/25/19 02:38 PM
09/25/19 02:38 PM
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BlueRacer69 Offline OP
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Originally Posted by Scott Carl
I'm going to s*it on both sides of the fence; I've done it both ways in many situations. Brass on brass and about any other type including a steel motorcycle tank, the brass (or, in the case of aluminum, the Al threads) will deform just enough to seal if I was too cheap to buy tape or dope. With the addition of sealant, its like very inexpensive assurance.
This is a NOS petcock going into a original factory 69 radiator. Maybe I should ask how did the factory do it back then. I do have both pipe dope and teflon tape in my toolbox, so no big deal. I just like keeping things as original as possible. Many thanks.

Re: New Petcock [Re: BlueRacer69] #2700797
09/25/19 02:42 PM
09/25/19 02:42 PM
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DuPont, Washington
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DZJim Offline
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Originally Posted by BlueRacer69
Does it need some sort of sealer on it before being screwed into the radiator? If so, what? Thank you. wrench


Only if you anticipate having to remove it in the future. In that case pipe dope or teflon would be cheap/easy insurance IMO.

Re: New Petcock [Re: 5thAve] #2700908
09/25/19 07:24 PM
09/25/19 07:24 PM
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Omaha Ne
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TJP Offline
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Originally Posted by 5thAve
The ones I've bought usually already had some sort of sealant on it.

The last time I needed one was a few years ago and every one I tried had the problem with the wing that spun before it was tight. I ended up buying a compressor drain valve that looked the same but made better for about the same price. No problems since.


iagree on both
Yes sealant. Loctite blue works excellent and you can wipe off the excess.

On the drains, Exactly what I did, bought 10 or them, made by Milton in this country smile But they don't have the little extension om the end for a hose, BUMMER! frown
The parts store ones cost me about 3 hours or more of utter frustration flame ozbbq

Last edited by TJP; 09/25/19 07:33 PM.
Re: New Petcock [Re: BlueRacer69] #2700990
09/26/19 12:07 AM
09/26/19 12:07 AM
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Quote
This is a NOS petcock going into a original factory 69 radiator. Maybe I should ask how did the factory do it back then. I do have both pipe dope and teflon tape in my toolbox, so no big deal. I just like keeping things as original as possible. Many thanks.


Doubt the factory had the worker applying tape or sealant on every valve they installed. Factory would have ordered valves with a sealant already applied to threads, if they used any at all. Typical of any production/assembly factory workings.


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