svigarfarms Posted March 26, 2015 Share Posted March 26, 2015 What should oil pressure be on a E7 at say 1600 RPM? Ours is running at about 40 thought maybe it is a little lower then I remember it being, checked the oil might be tad over full wandering if were getting fuel in the crankcase? Quote Link to comment Share on other sites More sharing options...
Dirtymilkman Posted March 26, 2015 Share Posted March 26, 2015 What year is the engine? Quote Link to comment Share on other sites More sharing options...
svigarfarms Posted March 26, 2015 Author Share Posted March 26, 2015 1996 400hp in a ch613 Quote Link to comment Share on other sites More sharing options...
RedBullDog Posted March 26, 2015 Share Posted March 26, 2015 What is your oil temp when you see 40 psi at 1600. The reason I ask is my 2001 460 will run just beyond 40 at 1600 when turnpike driving and oil temps get around 210. 15 at hot idle.The other day there was a stout cross wind and oil temps hung around at 220 or 225, wish there was a fix to drop oil temps,but I keep hearing that 210 and around is normal. Quote Link to comment Share on other sites More sharing options...
Dirtymilkman Posted March 26, 2015 Share Posted March 26, 2015 Rule of thumb is oil should run 20 degrees warmer than the coolant temperature. My trucks always run that 210 and 40-60 psi. Quote Link to comment Share on other sites More sharing options...
turckster Posted March 26, 2015 Share Posted March 26, 2015 Hot oil psi for 1996 E7-400 as per tune up manual:Idle: 10-30 psiGoverned speed: 34-64 psi Quote Link to comment Share on other sites More sharing options...
RedBullDog Posted March 26, 2015 Share Posted March 26, 2015 If I'm on 2 lane highways and such, where i'm running a few clicks slower, my oil temps run between the 200 and 210 marks. That few degrees gains a few psi too. Fixing to order the factory fan override switch and install it. Mack shop says they will need to reprogram something after I put in the switch. Long grades, summertime idling, and evening cool down time are much better if you can turn the fan on. This is the first truck I have owned that didn't come with an override. Quote Link to comment Share on other sites More sharing options...
RedBullDog Posted March 26, 2015 Share Posted March 26, 2015 Hot oil psi for 1996 E7-400 as per tune up manual:Idle: 10-30 psiGoverned speed: 34-64 psiQuite a big variable for pressures. Were there several different oil pumps used, or are those CYA ranges from engineers? Quote Link to comment Share on other sites More sharing options...
farmer52 Posted March 26, 2015 Share Posted March 26, 2015 Several variables concerning oil pressure - oil temperature, oil viscosity (not just new but used), pump rpm, pump wear, and variations in pumps. That is why the range. 1 Quote Ken PRR Country and Charter member of the "Mack Pack" Link to comment Share on other sites More sharing options...
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