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Unread 09-28-2011, 08:04 AM   #1
mulliflier
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what is the correct oil pressure in a 258?

I read somewhere that it was higher than you would think, like 75 psi. Wondering what you shuld expect at idle and then at part throttle (about 2K RPM).

Just wanted to verify that so I can put some tape marks on my aftermarket gauge.
Thanks!

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Unread 09-28-2011, 08:33 AM   #2
keith460
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FSM states: 13psi @ 600rpm (idle) and 37-75psi @ 1600+ rpm. 75psi max. Pressure relief valve will open after 75psi.
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Unread 09-28-2011, 08:54 AM   #3
zeronight
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i normally have seen just over 10 at idle on my factory gauge and close to 35 at speed.
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Unread 09-28-2011, 08:57 AM   #4
Matt1981CJ7
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Mine idles at about 18-20 and 40-50 under load, on the factory gauge.

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Unread 09-28-2011, 01:15 PM   #5
82JeepCJ7
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10psi per 1000rpm is a good rule of thumb.
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Unread 09-28-2011, 05:04 PM   #6
Falcon_CMH
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My CJ-7 starts cold at ~60-65 PSI idle. Then after it's warm it idles at ~20 PSI. Once the gas is applied it goes ~60-75 PSI depending on how much gas, steady gas it's at ~65 PSI. The RPM doesn't seem to matter. I recently replaced my rear main bearing seal (new oil pan seals all around too) and use 20w50 Castrol oil (white). I have a AMC 304.
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Unread 09-28-2011, 07:49 PM   #7
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I just rebuilt mine and it's running 35 at idle and 65 at 2000rpms after it's fully warmed up.
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Unread 09-28-2011, 08:21 PM   #8
BagusJeep
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Gauge shows 45psi at speed but being a cheap piece of Chinese crap mechanical gauge who knows what it means. At least I get the pleasure of knowing the needle moves.
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Unread 09-28-2011, 09:04 PM   #9
mulliflier
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Excellent, thanks for all the help guys!
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