Block drain petcock? - JeepForum.com
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post #1 of 8 Old 08-02-2021, 01:50 PM Thread Starter
mynameisrose
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Block drain petcock?

Hey all. Has anyone installed a brass petcock in the block coolant plug hole for easy and clean flushes?

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post #2 of 8 Old 08-02-2021, 04:22 PM
CJ7-Tim
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You can if you want, but having owned 8 XJ's over the last 19 years, I never found one to be necessary. I also never use the radiator drain valve, it is too fragile.

I always drain the cooling system by removing the lower radiator hose.

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post #3 of 8 Old 08-03-2021, 12:37 PM
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If you want, the easy way is to get what in the plumbing industry is known as a dishwasher ell, or elbow.

It is 3/8th NPT (For the block end) and a tight 90 that is 3/8th Flare.. Orient with the 90 facing down.

Then get a 3/8 Flare Cap. this is easy to remove with a socket but seals very well.
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post #4 of 8 Old 08-04-2021, 04:07 PM Thread Starter
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Nice. A 90 out of the block that I can stick a hose on and run into a bucket is just what I was thinking. Thanks for that. I was wondering about the thread pitch too, however I've read on other forums that the thread could also be 5/8 sae or 1/4 npt depending on block casting. I have a 94 so hopefully I can find the right one, or maybe I'll get all three before I do it and have my bases covered.
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post #5 of 8 Old 08-04-2021, 08:42 PM
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Well I guess I am dated cause I looked up a dishwasher ell and they now use a garden hose adapter and go to 3/8" compression fitting......... I suppose so a home owner doesn't need a Flaring tool and wrenches to install.

Back in the day the water inlet valve was 3/8 NPT and you used copper pipe and a flair to hook them up.

So What you want............... 3/8 NPT X 3/8" Flair adapter ell. and a 3/8" Flair cap.
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Last edited by Wyo; 08-04-2021 at 09:10 PM.
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post #6 of 8 Old 08-05-2021, 01:52 PM Thread Starter
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I saw that too. A street elbow with a petcock would probably work as well. I'll get something figured out with a handful of fittings. I would have liked a petcock in the lower rad hose but it's such a tight angle in there and changes size from 1-1/2 to 1-1/4.
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post #7 of 8 Old 08-05-2021, 05:06 PM
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The only reason for a petcock back in the day was because you used water and you drained the engine frequently (Daily) for freeze protection and rust issues/
You will drain every 2-3 years and the 90 will pee straight down to the container but you can still fit a piece of 1/2" ID garden hose over the threads if you want.
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post #8 of 8 Old 08-11-2021, 11:07 AM
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I used the brass petcock off a Volvo 240 redblock motor, fits perfectly and works much better. Has a hose-fitting end so no mess.
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