Oil Pressure @ Idle on 4.0

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Author Message   Narinder Pal (Narinder) Member Username: Narinder Post Number: 53 Registered: 03-2003 Posted on Monday, November 17, 2003 - 09:47 am:    Hello, what should the oil pressure be @ idle on the 4.0 motor ... mine starts at around 20psi and drops to about 10 - 13psi on warmup... should I be worried? I just replaced the oilpump (front cover) so if there is a problem its not the oil pump... could the main and rod bearings be the culprit. The oil is absolutley clean with no evidence of metal. Thanks in advance.   Mike M (Rangeroverhp) Member Username: Rangeroverhp Post Number: 47 Registered: 09-2003 Posted on Monday, November 17, 2003 - 07:56 pm:    When you drop the pan to inspect the bearings, check the pick up and screen. Maybe it's gummed up.   ron morgan (Rpm2429) New Member Username: Rpm2429 Post Number: 11 Registered: 08-2003 Posted on Friday, November 21, 2003 - 09:53 am:    a good rule of thumb is 10 psi for every 1000 of rpm.   Geoff 93 RRC (Geoff) Member Username: Geoff Post Number: 154 Registered: 11-2002 Posted on Friday, November 21, 2003 - 01:20 pm:    I think that is normal. These are low pressure motors. The bypass valve cuts in somewhere in the 40s, which is very low relative to say a SBC. The manual spec is for somewhere in the mid 20s psi at 2400 rpm when warm. I found a lot of information using Google once upon a time.