Which oil pressure gauge???

Cacti_Ken · Posted: Wed Jan 04, 2006 11:26 am Post subject: Which oil pressure gauge???

What is the correct oil pressure guage for the M38? 0-60psi or 0-120psi?
There is a picture in the manual that shows a 120psi guage in the panel. Wes, I have read where you say always go by the book.
From what I read on other post, the oil pressure is very low on these engines when they are at operating temp. I believe I would lean more to the 0-60psi gauge for the 4 cyl engine if that is the case

Ken.
_________________
Tropical Veteran
35th Inf. Reg. "CACTI" 4th I.D. VN
Amateur Radio K5XOM

OKCM38CDN · Guest

Ken, I beleive the correct one is the 120 psi from the factory with Douglas connectors, however a 60 psi will work with the correct sender. Not sure if they made a sender with Douglas connectors at 60 psi.

Also Douglas connector sending units can be hard to come by...

Hope this helps...

Cacti_Ken · Posted: Wed Jan 04, 2006 5:22 pm Post subject:

Hal did you put a 120psi gauge on your M38? What is the oil pressure when the engine is at operating temp. I realize that the gauge doesn't have effect on the pressure. I'm curious what your pressure is at operating temp.
_________________
Tropical Veteran
35th Inf. Reg. "CACTI" 4th I.D. VN
Amateur Radio K5XOM

OKCM38CDN · Guest

Yes, I was able to find a 120 douglas connector sender... Smile

I think I run about 20-30 PSI... it just barely comes off the scale... It does read though...

Hope this helps...

Cacti_Ken · Posted: Wed Jan 04, 2006 7:40 pm Post subject:

Doesn't make sense why they opted to put that high range guage on a engine that doesn't put up half the pressure of the gauge.
_________________
Tropical Veteran
35th Inf. Reg. "CACTI" 4th I.D. VN
Amateur Radio K5XOM

BobW · Posted: Wed Jan 04, 2006 9:08 pm Post subject:

I think it was because they were trying to standardize parts on M series vehicles. Some other M series vehicle needed 120psi so they all got it. Later they realized it wasn't a good idea for the Jeep and changed to 60 psi. I am using a 120psi guage with a 60psi sender on my M38. Everything looks correct and I just divide by 2 when reading the gauge. For example when my gauge read 60 it really means 30.
_________________
Bob W. Monticello, NY. 1952 CJ3A, 1952 M38, 1950 CJV-35/U

SteveJ · Posted: Thu Jan 05, 2006 9:25 pm Post subject:

My 52 M38 CDN came with a 60 psi gage and sender with douglas connectors It reads about 45psi on startup then runs just below 30 when warmed up. I also had a 53 M38A1CDN that also had a 60 PSI gage and sender. It sure makes it easier to read the oil press. Smile

_________________
SteveJ
1986 CDN Armstron MT500 dispatch Motorcycle
1986 arrow 1.75 t cargo trailer
1991 Reynolds Boughton RB44 GS TUH
1952 M38 CDN W/W (Sold)
1953 M100 CDN Trailer
1951 PE95K Genset (Sold)

Cacti_Ken · Posted: Thu Jan 05, 2006 9:41 pm Post subject:

My intention is to restore the jeep the best that I can with the correct parts. I am disappointed that a 0-120psi gage is a correct item.
The gage on my GMC 8 cylinder PickUp is 0-80. The oil pressure is 55psi at 2000RPM.
_________________
Tropical Veteran
35th Inf. Reg. "CACTI" 4th I.D. VN
Amateur Radio K5XOM

GregS · Member Joined: Apr 13, 2005 Posts: 174

Ken,

When you say "correct" parts, is that with factory original parts or correct parts for the M38. I ask this because many parts would have been correct for the M38 but not correct for a factory class restoration. A good number of parts were swapped out when the jeep was in motor pool, those parts would be correct for the jeep, just not correct for a factory class.

Cacti_Ken · Posted: Fri Jan 06, 2006 10:34 am Post subject:

I know it won't be a factory class restore. since I am going to use an electronic voltage regulator, and I'm not sure if that is qulified as a motor pool option either. So what the hey, I guess it won't make any differernce what I use. What ever I prefer. A good looking and running jeep for showing off and parading really was my first intention when I started the restore.
_________________
Tropical Veteran
35th Inf. Reg. "CACTI" 4th I.D. VN
Amateur Radio K5XOM

GregS · Member Joined: Apr 13, 2005 Posts: 174

A 60 PSI guage will do just fine and look appropriate, just not for a factory class restoration.

wesk · Posted: Sat Jan 07, 2006 9:17 pm Post subject:

Ken,
The army was pretty agressive in the retrofit of the 60 psi sender /gage to the pre- 55 jeeps. The transistoruzed regulator was originally introduced in the field and on late Willys stuff around 1956. It didn't show up in the ORD 9's but it did show up in the 1960's and up supply parts lists. So your motor pool jeep under judging for a claimed period of say 1958 would be correct with 60 psi gage/sender and transistorized voltage regulator and voltmeter. You could even add M series turn signal kit.
_________________
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


Create an account	Home · · Forums · · Articles · · Downloads · · Photo Gallery


PHP-Nuke Copyright © 2005 by Francisco Burzi. This is free software, and you may redistribute it under the GPL. PHP-Nuke comes with absolutely no warranty, for details, see the license.