Square head 1/4" NPT block water drains

[eldubb440]

what about a lathe chuck key, ground to size if necessary?

 

[oldbee]

Nope, needs to be female. I’d rather a 4-point rather than a 8-point.

 

[1968rt]

how about a metric 4 point socket....10mm would be close 10.16 =.40 https://www.amazon.com/HARFINGTON-B...chanical-Maintenance/dp/B0DQH27PCJ?gQT=1&th=1

 

[lilcuda]

This is what you need.

https://www.amazon.com/Extractor-Damaged-Removal-Broken-Multi-Spline/dp/B0F3HWNXQD/ref=asc_df_B0F3HWNXQD?mcid=c494f7cc1fb33897b6d64cea9352cc1e&hvocijid=4681002363480290176-B0F3HWNXQD-&hvexpln=73&tag=hyprod-20&linkCode=df0&hvadid=721245378154&hvpos=&hvnetw=g&hvrand=4681002363480290176&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9191535&hvtargid=pla-2281435177338&th=1

Find the one that fits tight, heat the plug, then pound in the extractor with a hammer, put some wax or PB Blaster on it and gently remove it with an impact gun using short bursts.

This was my method when I did tear downs when I was a machinist.

 

[Mick56]

This is what is being removed.

 

[toolmanmike]

This is what is being removed.
View attachment 1880206

Use a square drive socket or an 8 point if that's all you can find. Hit the plug with a small hammer to help upset the threads.

 

[Jeff K]

how about a metric 4 point socket....10mm would be close 10.16 =.40 https://www.amazon.com/HARFINGTON-B...chanical-Maintenance/dp/B0DQH27PCJ?gQT=1&th=1

This is spot-on. They're actually sold as 10mm drain plug sockets. Common on foreign cars. How they ended up in your block is another question entirely. But that's what you have. I just measured a couple 10mm open-end wrenches and got .401 - .403 across the flats, the socket should be similar.

Edited: The only other option I can think of is a 13/32 (.406) four-point socket, but they look hard to find.

 

[toolmanmike]

After 50 years, I can't take it anymore. I have to find the proper tool to remove these plugs. These plugs are square head .400" across. Yes, I can find square sockets. But not .400" across. Is there a Chrysler special tool for this? I can't fight this anymore. These blocks are over 50 years old and the plugs are stubborn. Yes, I can weld a nut on them and they've never failed to come out but I'd rather not have to do it that way. I have to find the proper tool to remove these plugs. Help me Obi-Wan Kenobe you're my only hope.

.400 measured at the top of the square or the bottom. They have a slight taper and a 1/4" square plug isn't exactly .250.

 

[33 IMP]

Four point 7/16.... and a piece of steel/aluminum shim.
(Out of curiosity, is a Metric socket close?)

Edit: sorry, didn't see post#27 before posting.

 

[thegarage]

After 50 years, I can't take it anymore. I have to find the proper tool to remove these plugs. These plugs are square head .400" across. Yes, I can find square sockets. But not .400" across. Is there a Chrysler special tool for this? I can't fight this anymore. These blocks are over 50 years old and the plugs are stubborn. Yes, I can weld a nut on them and they've never failed to come out but I'd rather not have to do it that way. I have to find the proper tool to remove these plugs. Help me Obi-Wan Kenobe you're my only hope.

check these out: https://www.amazon.com/dp/B09F64XLC...3df11e5953&sp_csd=d2lkZ2V0TmFtZT1zcF9kZXRhaWw

 

[lilcuda]

This is what is being removed.
View attachment 1880206

Oops! Disregard my response. I thought it was for female square plugs.