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Oil Pressure Question

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larry12574@sbcglobal View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote larry12574@sbcglobal Quote  Post ReplyReply Direct Link To This Post Topic: Oil Pressure Question
    Posted: 08 Jan. 2018 at 11:33am
Just bought a 48 CJ2A in fair shape. 134 supposedly rebuilt engine sounds excellent but loses oil pressure when the temp reaches 180. Can anybody steer me in the right direction to save me pulling the engine?
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WeeWilly View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote WeeWilly Quote  Post ReplyReply Direct Link To This Post Posted: 08 Jan. 2018 at 1:00pm
Welcome Larry to a great CJ2A club with tons of info on these fun little vehicles. Take some time and navigate through the web site to get familiar with it. Like your question would get more attention in the tech questions and answers forum.
As far as your oil pressure concern, it happens quite often to have what seems to be low oil pressure in these L134 engines. The manual states 6 psi at idle and 20 psi at around 30 MPH (2000 rpm) to be OK. I almost had a heart attack when my new rebuilt engine dropped to around 10 psi at idle on the first maiden voyage.
Good luck and enjoy your new adventure.

       Jim
47 CJ2A (Ranch Hand) 48 CJ2A, 48 Willys truck, T3C 3782, M274 (Military Mule)
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TERRY View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote TERRY Quote  Post ReplyReply Direct Link To This Post Posted: 08 Jan. 2018 at 7:27pm
What weight oil are you using?
BOULDER 48 2A
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Stev Quote  Post ReplyReply Direct Link To This Post Posted: 08 Jan. 2018 at 7:33pm
Larry,  Welcome!

The dip stick shows all of the oil in the engine - from full to empty is 4 quarts.   Make sure it is full of oil.

Stev
Stev
1946 CJ2A Trail Jeep, 1948 CJ2A Lefty Restored
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larry12574@sbcglobal View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote larry12574@sbcglobal Quote  Post ReplyReply Direct Link To This Post Posted: 12 Jan. 2018 at 12:04pm
5W30, no leaks no measurable consumption, just the low oil pressure worries me. I've read about the.070 port at the timing gear. Don't understand why that would cause loss of pressure once it warms up to 180.
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Post Options Post Options   Thanks (1) Thanks(1)   Quote binthere Quote  Post ReplyReply Direct Link To This Post Posted: 12 Jan. 2018 at 12:10pm
Most guys here will tell you to use Rottela T  15-40 diesel oil.
chuck
1953 CJ3B "a fistfull of dollars"
1949 willys jeepster "a few dollars more"
and a few other retirement toys




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larry12574@sbcglobal View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote larry12574@sbcglobal Quote  Post ReplyReply Direct Link To This Post Posted: 12 Jan. 2018 at 12:20pm
The 15-40 oil makes the most sense to me. These engines were built to such low tolerances. I'll let you know.Thanks.
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Post Options Post Options   Thanks (1) Thanks(1)   Quote WeeWilly Quote  Post ReplyReply Direct Link To This Post Posted: 12 Jan. 2018 at 3:04pm
I also went to Rotella 15-40 plus Lucas oil stabilizer and that raised the oil pressure by around 10 psi. I probably didn't need to do that but I just feel better with the higher oil pressure and the lower blood pressure.

   Jim
47 CJ2A (Ranch Hand) 48 CJ2A, 48 Willys truck, T3C 3782, M274 (Military Mule)
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Mark W. Quote  Post ReplyReply Direct Link To This Post Posted: 12 Jan. 2018 at 5:23pm
Rotella no longer has the recommended amount of zinc in it for our flat tappet engines. Rotella has 1200ppm of zinc Lucus Hot Rod and Classic oil (designed specifically for engines like ours with Flat Tappets has a zinc content of 2100ppm

All of the diesel oils have had the zinc and Phosphorous content reduced to meet the SN oil standards required with the new Ultra Low Sulfur fuel required in all post 2015 trucks.

Personally I will be using the Lucus Oil. Or one of the zinc additives.  
Chug A Lug
1948 2A Body Customized
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Late 50's 134L 9.25"clutch T90A D18 (1.25") D44/30 flanged E-Locker D25 5.38 Since 1962
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Post Options Post Options   Thanks (1) Thanks(1)   Quote cdn2a Quote  Post ReplyReply Direct Link To This Post Posted: 15 Jan. 2018 at 12:12pm
GM EOS will bring the zinc back for your favourite engine oil.
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Post Options Post Options   Thanks (1) Thanks(1)   Quote srlbotanical Quote  Post ReplyReply Direct Link To This Post Posted: 15 Jan. 2018 at 1:56pm
I use Rotella 15-40 with a bottle of Lucas TB Zinc Plus
Steve
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1997 TJ - The Trail Rig
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Post Options Post Options   Thanks (0) Thanks(0)   Quote larry12574@sbcglobal Quote  Post ReplyReply Direct Link To This Post Posted: 23 Jan. 2018 at 1:26pm
I changed the oil from 5w30 to 15w40 made absolutely no difference in the oil pressure. 35 to 40psi till it reaches normal operating temp, 180 to 200 degreesConfused. Scratching my head.

88mike "Shot Out"
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Post Options Post Options   Thanks (1) Thanks(1)   Quote smfulle Quote  Post ReplyReply Direct Link To This Post Posted: 23 Jan. 2018 at 1:45pm
Larry,

I read back through this and couldn't find it. 
Did you tell us what your warmed up oil pressure is?
What is it at idle and and higher revs?
Stan
48 CJ2A (Grampa's Jeep)
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larry12574@sbcglobal View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote larry12574@sbcglobal Quote  Post ReplyReply Direct Link To This Post Posted: 23 Jan. 2018 at 1:55pm
180 to 200 degrees is its normal operating temp oil pressure drops to about five psi at idle 600 t0 800rpm.
88mike "Shot Out"
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Post Options Post Options   Thanks (1) Thanks(1)   Quote TERRY Quote  Post ReplyReply Direct Link To This Post Posted: 23 Jan. 2018 at 2:08pm
You could verify with another gauge. Does the pressure rise with engine speed?
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Post Options Post Options   Thanks (1) Thanks(1)   Quote athawk11 Quote  Post ReplyReply Direct Link To This Post Posted: 23 Jan. 2018 at 2:54pm
 Just throwing this out there...

I remember reading a Willys Service Bulletin that talked about a change in the hole size for the oil sprayer that lubricates the timing gears.  The change was to stop oil starvation on one of the engine bearings, but it would probably have a positive impact on the oil pressure too.  The original .070" orifice was changed to .040".   If you have a sprayer with a .070" orifice, you could pull it, weld it closed then re-drill it to .040".  Not sure that it improves your "hot" oil pressure, but it's an easy enough fix to give it a try.    
1- 1946 CJ2A   
2- 1949 CJ3A
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Post Options Post Options   Thanks (1) Thanks(1)   Quote minnow1193 Quote  Post ReplyReply Direct Link To This Post Posted: 23 Jan. 2018 at 4:26pm
According to the gauge in mine, once warm at idle it show 5 psi. I run 15w40 and don't worry about it. Once I hit the gas it pops right up to 25. Same thing happens in my wagon with the same motor. 


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Post Options Post Options   Thanks (1) Thanks(1)   Quote binthere Quote  Post ReplyReply Direct Link To This Post Posted: 23 Jan. 2018 at 5:07pm
I have the same with my F134, and if you search around this and the CJ3B site, you will find that running pressure will be about 25 to 30 # and idle at about 5#. I had my F 134  rebuilt and that's what I'm getting.
chuck
1953 CJ3B "a fistfull of dollars"
1949 willys jeepster "a few dollars more"
and a few other retirement toys




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