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Unread 06-17-2013, 09:17 AM   #1
firefighter4x4
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1981 CJ5 
 
Join Date: Mar 2013
Location: Pioneer, CA
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Oil Pressure

I have an 81 CJ5 with a 4cyl and my oil pressure is between 20-30 psi on startup and when i am driving it can get down to 15-17 psi. The oil level is fine. Also when at high RPM, if i am driving up a inclined highway my lifters was start making clicking noises. Shoul my oil pressure be around 38psi? Also what could cause this?

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Unread 06-17-2013, 10:35 AM   #2
LumpyGrits
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Do NOT trust the OEM gauge!
Get a direct read mech. gauge.
How many miles on engine? What weight oil?
LG
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Unread 06-17-2013, 11:37 AM   #3
firefighter4x4
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Engine has 62,000 on the gauge but jeep had been towed alot. I use 5w-30. Any recomendations on oil gauge?
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Unread 06-17-2013, 11:49 AM   #4
LumpyGrits
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Why such a 'lite' oil?
Go to at least 10W-30 or 15W-40 oil.
I have 118K+ miles on mine and use Castrol 20W-50 all year.
VDO gauges are good.
LG
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Unread 06-17-2013, 11:58 AM   #5
Jawbox
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Go 15-40w... You might want to pull the pan though! I've got a 151 and when I pulled the pan I found my pickup was really clogged. It's a pretty easy job and worth replacing the oil pump and pickup at the same time. Also, do the mechanical guage... autometer makes some that match pretty well. If you do a mechanical gauge, I suggest a copper line.
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Unread 06-17-2013, 12:12 PM   #6
LumpyGrits
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Autometer=China made POS!
All USA made here.....
http://www.marshallinstruments.com/

LG
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Unread 06-17-2013, 10:20 PM   #7
james04si
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Quote:
Originally Posted by LumpyGrits View Post
Autometer=China made POS!
All USA made here.....
http://www.marshallinstruments.com/

LG
Pretty sure only the econo line autogage are from China and the regular auto meters are manufactured in Illinois. I have autometer gages and love them.
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Unread 06-17-2013, 10:55 PM   #8
wellmax
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might try the 15w40 shell rotella oil

if the problem continues the add a bottle of lucas oil stabilizer

that 5 weight oil is too thin
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Unread 06-17-2013, 11:47 PM   #9
LumpyGrits
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Quote:
Originally Posted by james04si View Post
Pretty sure only the econo line autogage are from China and the regular auto meters are manufactured in Illinois. I have autometer gages and love them.
Source
LG
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Unread 06-19-2013, 09:31 AM   #10
Jawbox
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I missed something in the original post. If you get more lifter noise as you run, I'm feeling more sure you've got oiling problems! Do get a mechanical gauge, but I'd really say it would be a good idea to take an afternoon and throw in a new oil pump and pickup. When you replace the oil, use the 15-40 rotella.

It's a pretty easy and cheap job.
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Unread 06-19-2013, 09:53 AM   #11
wellmax
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I have a 1984 jeep with 4 cylinder 150 ci engine, I know it is a different engine than yours.

but, I had a new long block installed, after about 5k miles one of the valves started to stick,
when it did the motor made a bad clicking noise.

an old dude at the napa store told me there was only two things I could do:
1. try marvel mystery oil, he said many times that oil will help keep the valve loose. (1 qt.- half in the oil crankcase and half in the fuel tank.

2. if the mmo does not work, then you only have the following option: pull the head and have it reworked.

I had changed the oil, was running synthetic oil, that help some, but did not completely solve the sticky valve problem.

the day I added the mmo to the crankcase and gas tank the valve was sticking and making a bad noise.

believe this or not:

within 30 seconds of adding the mmo to the motor oil, the clicking stopped and I only heard it for just a few seconds one other time a few months later.
that was 3 or 4 years ago and have never heard the clicking noise again.

I change oil in the old jeep about every 2 years, as I do not drive it much.
but always use synthetic oil 10w40 and add 1 qt of mmo to tank and crankcase.

knock on wood, so far, so good,

its worth a try before to have the motor or head torn down for rebuild.

some do not like synthetic oil, but I believe it has better lube properties than dino oil, if you are having lube related problems, as you are.
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