View previous topic :: View next topic |
Author |
Message |
bobbymc Member
Joined: Jun 30, 2018 Posts: 4
|
Posted: Sat Jun 30, 2018 7:14 am Post subject: M38A loosing oil pressure |
|
|
Hello everyone
Thanks for the add, i own a 1953 M38A, I have slowly been bringing back to
Life, yesterday i finally got it registered and took it on a 15 mile drive. Iv noticed my oil pressure dropping to almost 0, engine is not knocking or not loosing oil. It’s a new mechanical gauge and i have replaced all lines with
Original parts. My question is should i replace the oil pump? And if so how difficult is it. Thanks in advance. |
|
Back to top |
|
|
wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16260 Location: Wisconsin
|
Posted: Sat Jun 30, 2018 8:42 am Post subject: |
|
|
There are several things you can do at this point.
You didn't tell us if this low oil pressure is new problem or has always been low since you bought the jeep. I'll assume it's a new problem.
1 - Connect an external pump to the main oil gallery and pressurize the system by using an applied pressure of 45 lbs. Now what does your direct reading gauge read? Close to zero again means internal bearing wear beyond limits. A more normal reading means the pump is bad or needs to have it's pressure adjusted.
2 - Remove, disassemble & inspect the pump. If internal condition warrants replacement then by all means replace it.
3 - Do not rule out an erroneous gauge reading until you have substituted a known good gauge. _________________ 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 |
|
Back to top |
|
|
dpcd67 Member
Joined: Nov 25, 2016 Posts: 187 Location: Iowa
|
Posted: Sat Jun 30, 2018 10:36 am Post subject: |
|
|
What oil are you using? You said your pressure dropped, so that implies it was at a higher reading before it dropped.
What was it when you started it, and what oil are you using.
Also, since you asked how to replace the oil pump, that tells me that you have not studied your Operators and Maintenance TMs.
Part of owning a military vehicle; get a complete set of TMs and study them every day. I still do.
Don't start replacing parts until you have found the root cause. Trouble shoot the cause first and do not chase symptoms with new parts. |
|
Back to top |
|
|
bobbymc Member
Joined: Jun 30, 2018 Posts: 4
|
Posted: Sat Jun 30, 2018 12:51 pm Post subject: |
|
|
At start up it is at 45 psi- after about 3O minutes or at normal running temp it drops to around 3 psi at idol. I run 15-40 motor oil. It’s a new problem, it started when i changed oil lines from filter. Thanks again |
|
Back to top |
|
|
4x4M38 Member
Joined: May 30, 2014 Posts: 3447 Location: Texas Hill Country
|
|
Back to top |
|
|
bobbymc Member
Joined: Jun 30, 2018 Posts: 4
|
Posted: Sat Jun 30, 2018 6:56 pm Post subject: |
|
|
All parts where bought new old stock from a local military surplus. All put back in the same position, same exact hoses. Thanks i believe i have found the issue, will post back if it cures the problem. Thanks for all the feed back. |
|
Back to top |
|
|
charlesfitton Member
Joined: Jun 07, 2010 Posts: 69 Location: Maryhill On
|
Posted: Sun Jul 22, 2018 5:53 am Post subject: |
|
|
[quote=".....Thanks i believe i have found the issue, will post back if it cures the problem.[/quote]
Tell us more.. _________________ M38 CDN 52-30105
M38 CDN 52-30883
and other green crap... |
|
Back to top |
|
|
bobbymc Member
Joined: Jun 30, 2018 Posts: 4
|
Posted: Sun Jul 22, 2018 12:06 pm Post subject: |
|
|
Sorry if forgot to post back, the problem was the oil filter cap.
The nut on top was loose, i tighten it down and boom . Constant 28 psi oil pressure. |
|
Back to top |
|
|
MarkR1951M38 Member
Joined: Aug 22, 2016 Posts: 117 Location: Huntsville, AL
|
|
Back to top |
|
|
|