88AMComanche Posted September 5, 2011 Share Posted September 5, 2011 Hope this isnt a repost. Apologies if it is. I have a 4.0 Renix engine and use a mechanical SUN pressure gauge. When i start the jeep 1st thing ,my pressure sits around 40-60 ...after about 10-15 minutes driving ....It will read as low as 17 at idle. this concerns me. Would like input weather i should be stressing or not over this. Never seen it go below that no matter how long it runs,but still .... Link to comment Share on other sites More sharing options...
ComancheKid45 Posted September 5, 2011 Share Posted September 5, 2011 Per FSM.... Operating range is 35-75psi at speed and no less than 13psi at Hot Idle Id say your alright :thumbsup: Link to comment Share on other sites More sharing options...
nitroxsteve Posted September 6, 2011 Share Posted September 6, 2011 Thats exactly how my guage reads and I also have a mechanical guage. Also my engine was just rebuilt so the bearing clearance is good. Link to comment Share on other sites More sharing options...
88AMComanche Posted September 6, 2011 Author Share Posted September 6, 2011 Thats exactly how my guage reads and I also have a mechanical guage. Also my engine was just rebuilt so the bearing clearance is good. Wow, awesome to hear. & Thanx. Link to comment Share on other sites More sharing options...
88AMComanche Posted September 6, 2011 Author Share Posted September 6, 2011 Per FSM.... Operating range is 35-75psi at speed and no less than 13psi at Hot Idle Id say your alright :thumbsup: TYVM. much appreciated Link to comment Share on other sites More sharing options...
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