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radtech Member
Joined: Aug 09, 2010 Posts: 183
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Posted: Tue Nov 28, 2017 4:12 pm Post subject: Early M38 temp.gauge with resistor |
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Will the temp. sending unit 7728851 work with the early M38 gauge with external resistor?The ORD 9 manual is not specific as to which sending unit goes with which gauge. |
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wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16256 Location: Wisconsin
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radtech Member
Joined: Aug 09, 2010 Posts: 183
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Posted: Tue Nov 28, 2017 6:58 pm Post subject: |
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I have both early and late type temp sending units 7728851 and 7389566.The early one reads 270 ohms while the late reads 4,400 ohms cold.Both NOS.
Last edited by radtech on Tue Nov 28, 2017 11:15 pm; edited 1 time in total |
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wesk Site Administrator
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radtech Member
Joined: Aug 09, 2010 Posts: 183
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Posted: Tue Nov 28, 2017 11:32 pm Post subject: |
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Types of temperature gauges as the heading of my request plainly says. |
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wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16256 Location: Wisconsin
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4x4M38 Member
Joined: May 30, 2014 Posts: 3447 Location: Texas Hill Country
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4x4M38 Member
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4x4M38 Member
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wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16256 Location: Wisconsin
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Posted: Wed Nov 29, 2017 10:34 am Post subject: |
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Looks like this post has drifted too far off topic.
This is about water temp only.
The two water temp gauges are:
7728855 - external resistor
7389567 - Internal resistor
These are on page 151 of the M38 1955 ORD 9
The only sender is in the 55 ORD 9 is:
7389566 - By the listing works on both gauges.
This is on page 163 of the M38 1955 ORD 9.
However the two senders shown under that ORD# are AC# 1512423 and AC# 1512245. If you open the 1951 ORD 9 you will find the AC# 1512245 listed as ORD# 7728851 lending credence to an error in the 1955 ORD 9.
Radtech obviously has a typo in his post (7728851)
Obviously Radtech needs to properly ID his sender by the AC part number. _________________ 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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4x4M38 Member
Joined: May 30, 2014 Posts: 3447 Location: Texas Hill Country
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Posted: Wed Nov 29, 2017 11:28 am Post subject: |
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Yes, water temp gauges and senders only.
I was thinking the same thing about an error in the 1955 version.
I'll go see if I can find my 1512245 that I got from Brent and do a cold resistance check.
If it's 270 cold then I'd say we have a case for a different sender specifically for the early external resistor gauge.
And Rad must have a copy of the 1951 Ord if he has the earlier 7728851 number at hand! _________________ Brian
1950 M38
MC11481
http://www.willysmjeeps.com/v2/modules.php?set_albumName=album372&op=modload&name=gallery&file=index&include=view_album.php |
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4x4M38 Member
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radtech Member
Joined: Aug 09, 2010 Posts: 183
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Posted: Wed Nov 29, 2017 6:40 pm Post subject: |
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I have AC 7728851 it reads 245 ohms cold.ac 7389566 reads 4,400 ohms cold. |
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wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16256 Location: Wisconsin
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Posted: Wed Nov 29, 2017 10:00 pm Post subject: |
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You guys will need to get the senders in a temp regulated environment with an Ohm meter connected and take readings at specific temps then compare your readings. That is the only way you can accurately assess the sender's performance.
The TB 2300-228-20 is helpful with approximations of readings but offers no real accuracy.
I have always removed the sender from the blocks and suspended it in a pan of water (not touching the inside of the pan) and left it mated electrically to it's gauge and with a thermometer in the water I would adjust the water temp and look for a matching reading between the thermometer and the gauge.
Radtech, I assume you plan to use the sender with a gauge PN 7728855 and a 95 Ohm external resistor? _________________ 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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4x4M38 Member
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