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

Password

Don't have an account yet? You can create one here.

Navigation
· Home
· Article Archive
· Article Submit
· Downloads
· FAQ
· Forums
· Members List
· Photo Gallery
· Private Messages
· Web Links
· Your Account

Search Articles



Forums

M38 waterproof venting
My 38 project for sale possibly?
m38a1 pintle
Minimum brake drum thickness M38
1953 A1 Grille/Radiator Rubber Mount
WINDSHIELD GLASS STENCIL
Brake Question M38 52
Photo Gallery Request!
Grote side reflectors on M38 June 1952
Bumper unit markings. Yes I have read the army regs!

Willys M Jeeps Forums


willysmjeeps.com :: View topic - F134 oil pressure numbers?
 Forum FAQForum FAQ   SearchSearch   UsergroupsUsergroups   ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

F134 oil pressure numbers?

 
Post new topic   Reply to topic    willysmjeeps.com Forum Index -> Technical Knowledge Base
View previous topic :: View next topic  
Author Message
Hank44
Member


Joined: May 06, 2014
Posts: 4

PostPosted: Tue May 26, 2020 8:14 pm    Post subject: F134 oil pressure numbers? Reply with quote

I've been running my M38a1 with it's freshly rebuilt F134 Hurricane for a few months now going through the 500 mile break-in period that the engine builder specified. My question is what oil pressure should I expect to see on the gauge both at idle and at cruising RPM in third gear?
My gauge seems to sit pretty constant between about 25 and 30 pounds all the time. It will drop a bit closer to the 25 mark when the engine is hot, but RPM does not seem to change things one way or the other.
Does this seem like the way it should be?
_________________
1964 M38a1
1964 M-37
Back to top
View user's profile Send private message
wesk
Site Administrator
Site Administrator


Joined: Apr 04, 2005
Posts: 14915
Location: Wisconsin

PostPosted: Tue May 26, 2020 9:48 pm    Post subject: Reply with quote

It can be tough to give an opinion on gauge readings without knowing a bit more about the gauge. IE Stock 24V 0-120 Lb gauge or 0-60 Lb gauge or perhaps another aftermarket type? Did you not use a simple direct reading gauge on initial runups? This would give you some sense of the accuracy of your electric gauge.

If your readings are accurate then they are about average for about half the rebuilt L & F 134's. The majority of overhauls today seem to be focused on bores, pistons, rings and standard bearings. Very few rebuilders today bother to clearance check piston fits, plastic-gauge bearing clearances, clearance check cam journals or lifter bores. Oil pumps are seldom checked for proper clearances. All of these must be done and done well to get consistent 40-55 PSI oil readings.
_________________
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
View user's profile Send private message Send e-mail Visit poster's website
Hank44
Member


Joined: May 06, 2014
Posts: 4

PostPosted: Wed May 27, 2020 2:28 am    Post subject: Reply with quote

Sorry.....I guess I should have said that it was still 24 volt with the stock 0-60 psi gauge. I tend to take that stuff for granted I guess.

The engine was rebuilt by a very popular local machine shop. They did the initial start-up and run-in. Given back to me, I was told to put about 500 miles on it before bringing it back to them for an oil change and inspection.

Honestly, I have found a few things in question with the way that the install was performed. At this point, I'm trying to lay down some facts and answer some questions before I either go back to them an argue that they be corrected, or find someplace more competent to get the rig squared away.

I do not have a mechanical gauge to test the factory one against. I believe the one that is in the dash reads correctly, but yes...I should verify that.

I'd be really interested in anyone could recommend a quality repair facility in the San Francisco Bay area of California that is familiar with military vehicles. These guys that did the work are supposedly a reputable machine shop, but it has became very clear that these kind of vehicles are not their thing....

Thanks
_________________
1964 M38a1
1964 M-37
Back to top
View user's profile Send private message
wesk
Site Administrator
Site Administrator


Joined: Apr 04, 2005
Posts: 14915
Location: Wisconsin

PostPosted: Wed May 27, 2020 9:05 am    Post subject: Reply with quote

Have you confirmed your 60 PSI range gauge has the correct 60 PSI range sender and not the 0-120 PSI sender?

The only real method of determining the accuracy of an electrical operated gauge using a sender is to substitute a mechanical gauge. It is a very simple thing to do and the gauges are very inexpensive. In fact it is also a good idea to keep a mechanical water temp gauge in your tool kit as well. Having physical proof that your gauge readings are accurate is much better then having unfounded faith in your gauge's readings.


As reasonable as $59.95 for the pair

https://sinisterdiesel.com/i-16542399-auto-meter-auto-gauge-series-oil-pressure-and-water-temperature-gauge.html?gclid=Cj0KCQjwn7j2BRDrARIsAHJkxmwF_pZTeQEJDLqoc929Mx-G_dJfjmLqVRtFnDVosb6XmDE87tOAnxoaAucAEALw_wcB


as cheap as $20.99

https://www.summitracing.com/parts/sum-g2924?seid=srese1&gclid=Cj0KCQjwn7j2BRDrARIsAHJkxmx0kzpG-KFRi5Rtbq9gYdhpfOLnKD0vW_4lBbbQofx6oTR5GNyrEBAaAkq8EALw_wcB
_________________
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
View user's profile Send private message Send e-mail Visit poster's website
dpcd67
Member


Joined: Nov 25, 2016
Posts: 157
Location: Iowa

PostPosted: Thu May 28, 2020 6:36 pm    Post subject: Reply with quote

Very few rebuilders check the piston fit, bearing clearances etc???
Give me the name of your machine shop so I make sure never to use him.
I use Abrahams, the best old time automotive machine shop in the world, and yes, guys ship engines to them. I saw a 12 cylinder flat head from a Packard there from New Zealand; a monster complicated flat head.
As for oil pressure, yours is typical for used stock oil pumps; Mellings will do 60 easily.
_________________
M38 23100 June 51
M38 34523 Sep 51
M606/CJ3B 1964 Kaiser 57348 118458
M37B1 1963
Willys MB 1944
Ford GPW 1942
Dodge WC63 1943
Dodge Power Wagon WM300 1967
Plymouth Barracuda, 1973, 340 4 barrel
All ground up restored by me.
Lots of others.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    willysmjeeps.com Forum Index -> Technical Knowledge Base All times are GMT - 6 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum

Powered by phpBB © 2001 phpBB Group
Forums ©

 



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.