Okiki Olufokunbi Posted July 2, 2013 Share Posted July 2, 2013 Hello,I started getting low oil pressure on my 94 CH 613 E7 mechanical truck after replacing one of the cylinder heads. The pressure used to run at 35 psig idle hot , but is now at 15 psig idle hot. We have replaced the oil pump, there is no improvement in the pressure.Is there an oil relief valve or backpressure regulator, that could have stuck open, on the E7 mechanical engine?What other things can cause low oil pressure in this engine? I will appreciate any insight.ThanksOO Quote Link to comment https://www.bigmacktrucks.com/topic/31785-mack-e7-mechanical-low-oil-pressure-issue/ Share on other sites More sharing options...
dds92780 Posted July 2, 2013 Share Posted July 2, 2013 I think it is supposed to be that low stock Quote Slow and Steady Wins the Race! Link to comment https://www.bigmacktrucks.com/topic/31785-mack-e7-mechanical-low-oil-pressure-issue/#findComment-192252 Share on other sites More sharing options...
rsb502 Posted July 2, 2013 Share Posted July 2, 2013 how much pressure does it have at speed on the road, say 1500-1750rpm? I cant remember what my 93 made at idle but it wasnt much after it warmed up. Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment https://www.bigmacktrucks.com/topic/31785-mack-e7-mechanical-low-oil-pressure-issue/#findComment-192256 Share on other sites More sharing options...
96bulldogpower Posted July 5, 2013 Share Posted July 5, 2013 I run my 96 CH with the e7 all day and that's exactly what I see all day long. 15 psi sounds good. 30's at idle sounds way too high. It is however normal for it to be in its 30's at idle while cold. Or atleast that's how mine is and it has been nothing but reliable Quote Link to comment https://www.bigmacktrucks.com/topic/31785-mack-e7-mechanical-low-oil-pressure-issue/#findComment-192712 Share on other sites More sharing options...
96bulldogpower Posted July 5, 2013 Share Posted July 5, 2013 Did you replace the oil filters when you noticed this change? I doubt it but what if your old ones we're cligged? Your pressures sound normal Quote Link to comment https://www.bigmacktrucks.com/topic/31785-mack-e7-mechanical-low-oil-pressure-issue/#findComment-192713 Share on other sites More sharing options...
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