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post #1 of (permalink) Old 06-11-2004, 09:05 AM Thread Starter
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to much oil pressure

When I bought my jeep I noticed that it had excellent oil pressure for a 258, 50+ lbs.

In a few of the posts here I noticed that low oil pressure is the norm for these engines.

I removed the oil pressure sender and installed a mechanical gauge, still 50-65 lbs.

To much of a good thing?

I figure that the relief might be stuck,there are no abnormal oil leaks.

If it is, then I am probably stressing some oil pump drive components

Is the pressure relief on the pump?

A typical spring and piston setup?

would you do a repair or just watch it

My experience is that if it is going to break it will at the worst time

thanks in advance
Greg [img]images/graemlins/scs.gif[/img]
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post #2 of (permalink) Old 06-11-2004, 12:26 PM
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Re: to much oil pressure

well, at least you have oil pressure [img]images/graemlins/grin.gif[/img]

Is it high all the time? Cold Warm, Idle, higher RPMs? does it fluctuate?

When I crank myine up from Cold, I'll have High pressure, but after it warms up, it'll drop to 15-20 at idle. bring the rpms up and it'll go up to 50 or so.

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post #3 of (permalink) Old 06-11-2004, 05:47 PM Thread Starter
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Re: to much oil pressure

45 lbs at idle and 65 lbs. at higher rpms
oil pressure drops 5-10 lb. when she warms up
there is some fluctuation in the eletric gauge but the mech. guage is steady
the ele. guage pegs out at 65lbs. but the mech goes to 80 lbs. I have never seen it go above 65 lbs.
either the relief is working or the pump is incapable of putting out any more.
whaddaya think?
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post #4 of (permalink) Old 06-11-2004, 07:01 PM
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Re: to much oil pressure

</font><blockquote><font class="small">In reply to:</font><hr />
45 lbs at idle and 65 lbs. at higher rpms
oil pressure drops 5-10 lb. when she warms up
there is some fluctuation in the eletric gauge but the mech. guage is steady
the ele. guage pegs out at 65lbs. but the mech goes to 80 lbs. I have never seen it go above 65 lbs.
either the relief is working or the pump is incapable of putting out any more. whaddaya think?

[/ QUOTE ]

I'm thinking that I would be thrilled [img]images/graemlins/smile.gif[/img] [img]images/graemlins/smile.gif[/img]

Just a guess.... the prior owner rebuilt the motor?? Any idea of the miles since the rebuild??

It doesn't leak (I only resently found that was possible).
It doesn't use oil.
It doesn't have funny things in the oil when you change it.
It doesn't foul plugs and get all grumpy.
It doesn't make ugly noises (bang, clang etc).
It has power and runs the way you want.

I'm no motor head but I thinking it's good to go if the above are true.

Heck be happy, you have a 258 that oils it's self better than the original design.

Just my thoughts.... sometimes I'm wrong.

Dale
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post #5 of (permalink) Old 06-11-2004, 08:13 PM
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Re: to much oil pressure

Mine runs between 50 and 60 on the gauge. The motor was recently rebuilt and as of now has no leaks and the oil pressure holds steady in that range no matter what rpm or temp. I'm thrilled. It used to start around 60 and drop to about 10 after getting hot. It also used to keep the roads and parking lots oiled.
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post #6 of (permalink) Old 06-11-2004, 09:34 PM Thread Starter
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Re: to much oil pressure

When I bought this jeep a couple of years ago the po had 3 other VERY nice jeeps in his immalicate shop. I tried to talk him out of the sweet flat fender he had.
When I changed the cam the second time, Crane Tech wanted me to make sure that the push rods were rotating, so I put clothes pins on the rockers to subdue the splash, ( an old SBC trick) fired 'er up and the oil shot up through the rockers and hit the hood, me think's she's oiling [img]images/graemlins/smile.gif[/img]
This engine has 70,000 easy miles on it and has never been re-built. When I pulled the head it had a factory jeep gasket and I could not find any globs of silicone anywhere.
I will not worry about to much oil pressure

Thanks
Greg
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post #7 of (permalink) Old 06-12-2004, 04:44 PM
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Re: to much oil pressure

</font><blockquote><font class="small">In reply to:</font><hr />
45 lbs at idle and 65 lbs. at higher rpms
oil pressure drops 5-10 lb. when she warms up

[/ QUOTE ]

Man, that sounds pretty healthy to me... Dangerously high pressure on these is like over 80 or some crap like that. That sounds like a pretty good presure to me. wouldn't worry about a thing.
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