Oil Pressure Question |
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larry12574@sbcglobal
Member Joined: 08 Jan. 2018 Location: MidlothianTexas Status: Offline Points: 6 |
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Posted: 08 Jan. 2018 at 4:33pm |
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
Member Sponsor Member x 2 Joined: 07 May 2009 Location: Clayton IN Status: Offline Points: 3422 |
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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 |
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47 CJ2A (Ranch Hand) 48 CJ2A, 48 Willys truck, T3C 3782, M274 (Military Mule)
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TERRY
Member Sponsor Member Joined: 22 May 2007 Location: BOULDER COLORADO Status: Offline Points: 3396 |
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What weight oil are you using?
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BOULDER 48 2A
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Stev
Member Sponsor Member Joined: 27 July 2016 Location: Cincinnati Status: Offline Points: 2383 |
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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
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Stev
1946 CJ2A Trail Jeep (The Saint), 1948 CJ2A Lefty Restored |
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larry12574@sbcglobal
Member Joined: 08 Jan. 2018 Location: MidlothianTexas Status: Offline Points: 6 |
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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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binthere
Member Joined: 29 Nov. 2010 Location: Cherryville B.C Status: Offline Points: 707 |
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Most guys here will tell you to use Rottela T 15-40 diesel oil.
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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
Member Joined: 08 Jan. 2018 Location: MidlothianTexas Status: Offline Points: 6 |
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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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WeeWilly
Member Sponsor Member x 2 Joined: 07 May 2009 Location: Clayton IN Status: Offline Points: 3422 |
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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 |
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47 CJ2A (Ranch Hand) 48 CJ2A, 48 Willys truck, T3C 3782, M274 (Military Mule)
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Mark W.
Member Sponsor Member Joined: 09 Nov. 2014 Location: Silverton, OR Status: Offline Points: 7923 |
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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. |
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Chug A Lug
1948 2A Body Customized 1949 3A W/S 1957 CJ5 Frame Modified 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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cdn2a
Member Joined: 03 Nov. 2010 Location: Canada (North) Status: Offline Points: 234 |
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GM EOS will bring the zinc back for your favourite engine oil.
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srlbotanical
Member Joined: 03 July 2017 Location: Saranac MI Status: Offline Points: 395 |
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I use Rotella 15-40 with a bottle of Lucas TB Zinc Plus
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Steve
1948 CJ2A - The Good Dog 1997 TJ - The Trail Rig 2001 XJ - The kids ride |
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larry12574@sbcglobal
Member Joined: 08 Jan. 2018 Location: MidlothianTexas Status: Offline Points: 6 |
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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 degrees. Scratching my head.
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88mike "Shot Out"
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smfulle
Member Sponsor Member Joined: 16 Sep. 2010 Location: Ogden, Utah Status: Offline Points: 6123 |
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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?
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larry12574@sbcglobal
Member Joined: 08 Jan. 2018 Location: MidlothianTexas Status: Offline Points: 6 |
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180 to 200 degrees is its normal operating temp oil pressure drops to about five psi at idle 600 t0 800rpm.
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88mike "Shot Out"
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TERRY
Member Sponsor Member Joined: 22 May 2007 Location: BOULDER COLORADO Status: Offline Points: 3396 |
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You could verify with another gauge. Does the pressure rise with engine speed?
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BOULDER 48 2A
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athawk11
Member Joined: 18 Jan. 2012 Location: Arvada,Colorado Status: Offline Points: 4145 |
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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.
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1- 1946 CJ2A
2- 1949 CJ3A |
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minnow1193
Member Joined: 11 June 2014 Location: Tampa FL Status: Offline Points: 209 |
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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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binthere
Member Joined: 29 Nov. 2010 Location: Cherryville B.C Status: Offline Points: 707 |
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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.
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chuck
1953 CJ3B "a fistfull of dollars" 1949 willys jeepster "a few dollars more" and a few other retirement toys |
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