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willysmjeeps.com :: View topic - M38 thermostat housing with removable plug in top
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M38 thermostat housing with removable plug in top

 
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Harleygaz
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Joined: Jul 18, 2019
Posts: 71
Location: Mississippi, near Memphis TN

PostPosted: Mon Feb 24, 2020 3:30 pm    Post subject: M38 thermostat housing with removable plug in top Reply with quote

Hi. Just picked up a head for my M38 and the thermostat housing has a threaded square head plug in the top. My other one does not and I havenít seen any pictures of any that have. Looks like it could be a great help for venting the system when filling but could it be a late modification or maybe civilian? It is painted what looks to be the correct shade of green but that doesnít mean much really. Any ideas?
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Gary
M38 - June 1952
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45auto
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Joined: Apr 06, 2005
Posts: 122
Location: Georgia

PostPosted: Mon Feb 24, 2020 9:47 pm    Post subject: Reply with quote

Sounds like you have a head off a Willys engine used in a PE-95 Generator Unit. Can you post a picture?
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Harold W.
MVPA #6833
1945 GPW
1950 CJV-35/U
1951 M38 1952 M38
1962 USMC Contract M38A1
1953 Strick M100 1967 Johnson M416
1968 CJ5 4-Speed 1969 CJ5 V6
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wesk
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Joined: Apr 04, 2005
Posts: 14721
Location: Wisconsin

PostPosted: Tue Feb 25, 2020 12:31 am    Post subject: Reply with quote


M38 engine thermostat housing only has the raised boss.


Here's a PE95 engine with the wide housing and the temp gauge sender on top.

[https://i.ebayimg.com/images/g/eXoAAOSwV3dcCYVw/s-l640.jpg][/img]
Here's another photo showing the housing and sender alone.
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php
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Harleygaz
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Joined: Jul 18, 2019
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Location: Mississippi, near Memphis TN

PostPosted: Tue Feb 25, 2020 7:45 pm    Post subject: Reply with quote

Housing doesnít look like the PE95 one. Itís exactly like the top one and two others that I have but the top boss is threaded to take a plug like the one by #4 spark plug in the top picture. All the casting marks on the head match the late M38 head marks in the M38 green book.
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Gary
M38 - June 1952
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wesk
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PostPosted: Tue Feb 25, 2020 11:11 pm    Post subject: Reply with quote

The correct M38 head is a 800376 casting. The M38 version has the raised boss at the front vertical surface drilled and tapped for a pipe thread fitting that accomodates the water pump bypass. The civilian version of this head does not have that raised boss drilled and threaded. The thermostat housing was raised boss top center only with no hole or threads. You should post a photo of what you have so we can offer something better than a wild guess at what it is.
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php
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Harleygaz
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Location: Mississippi, near Memphis TN

PostPosted: Wed Feb 26, 2020 7:30 pm    Post subject: Reply with quote

Housing doesnít look like the PE95 one. Itís exactly like the top one and two others that I have but the top boss is threaded to take a plug like the one by #4 spark plug in the top picture. All the casting marks on the head match the late M38 head marks in the M38 green book.
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Gary
M38 - June 1952
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wesk
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PostPosted: Wed Feb 26, 2020 8:57 pm    Post subject: Reply with quote

And does this odd thermostat housing head have the open, threaded water pump bypass port at the front end?


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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php
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Harleygaz
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Location: Mississippi, near Memphis TN

PostPosted: Thu Feb 27, 2020 2:25 pm    Post subject: Reply with quote

Hi Wes. The head does have the raised boss drilled and tapped with a threaded spigot in place for the water pump bypass so Iím sure it is the correct head for an M38. The thermostat housing has A1192 then a gap then 1 stamped on it running from near the flange and going towards the dome. The bolts are new so I have no way of knowing if this housing belongs with this head.
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Gary
M38 - June 1952
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wesk
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PostPosted: Thu Feb 27, 2020 11:13 pm    Post subject: Reply with quote

Well then the solution to your problem is quite simple. Take the thermostat housing from your old head which is correct for the M38 and put it on your new head and take the unusual housing from your new head and place it on the mantel or Ebay.

Usually a M38 cylinder head when purchased brand new or used came by itself with no accessories bolted to it, so essentially you have been fortunate to not only find a replacement head, you also have a very unusual housing to discuss the next few years with other jeep folks.

A-1192 is the correct part number for the Willys MA, MB, M38, CJV35, CJ2A, CJ3A, 4x4-63, Wagons 2WD & 4WD, and Industrial L-134. It may be time to guess that just maybe someone over the last half century took the liberty to drill the boss and tap it for a pipe plug or some other specialty application they had envisioned for it.
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php
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