loweredf1 Posted March 29, 2011 Share Posted March 29, 2011 recently rebuilt our e7-350 and had a hard time running the overhead but believe we got it right. anyway problem now is oil pressure when warm is showing >15psi at idle and jake barely makes any noise sometimes none. we did not change pump during rebuild because it checked out good. well today we went and got a 500 pump and pickup put it in and no differnce. so my question is could the overhead adjustment cause low oil pressure? or any other ideas? we checked every bearing clearance during assembly and everything was in spec. Quote Link to comment https://www.bigmacktrucks.com/topic/18500-low-oil-pressure/ Share on other sites More sharing options...
fjh Posted March 29, 2011 Share Posted March 29, 2011 recently rebuilt our e7-350 and had a hard time running the overhead but believe we got it right. anyway problem now is oil pressure when warm is showing >15psi at idle and jake barely makes any noise sometimes none. we did not change pump during rebuild because it checked out good. well today we went and got a 500 pump and pickup put it in and no differnce. so my question is could the overhead adjustment cause low oil pressure? or any other ideas? we checked every bearing clearance during assembly and everything was in spec.Check the end of the rocker shafts and make sure there are plugs in the ends they tend to pop out on these engines.The valve set likly has no connection to your problem! Quote Link to comment https://www.bigmacktrucks.com/topic/18500-low-oil-pressure/#findComment-75132 Share on other sites More sharing options...
MACKS Posted March 29, 2011 Share Posted March 29, 2011 My E-7 350 has always had low oil pressure at idle,about 12 lbs,everyone I know says the same thing about the e-7,mack says that is whithin spec and no problem that's the way they are. Quote Link to comment https://www.bigmacktrucks.com/topic/18500-low-oil-pressure/#findComment-75135 Share on other sites More sharing options...
Mackpro Posted March 29, 2011 Share Posted March 29, 2011 My E-7 350 has always had low oil pressure at idle,about 12 lbs,everyone I know says the same thing about the e-7,mack says that is whithin spec and no problem that's the way they are.Yea dont worry till it goes below 10 PSI at hot idle, its common. Quote Link to comment https://www.bigmacktrucks.com/topic/18500-low-oil-pressure/#findComment-75145 Share on other sites More sharing options...
loweredf1 Posted March 29, 2011 Author Share Posted March 29, 2011 we just expected more on a fresh rebuild. i will check the rocker shaft plugs Quote Link to comment https://www.bigmacktrucks.com/topic/18500-low-oil-pressure/#findComment-75159 Share on other sites More sharing options...
Mackpro Posted March 30, 2011 Share Posted March 30, 2011 we just expected more on a fresh rebuild. i will check the rocker shaft plugsOn the Etech style engines they do make a high volume oil pump that helps. On the older E-7's I dont know. I think the oil pump on the Etech style engines turns backwards compaired to the older E-7's. I know the auxilary shaft turns different because the P/S pumps that bolt on the front timing cover wont interechange, found out the hard way! Quote Link to comment https://www.bigmacktrucks.com/topic/18500-low-oil-pressure/#findComment-75166 Share on other sites More sharing options...
loweredf1 Posted March 30, 2011 Author Share Posted March 30, 2011 well put a pressure gauge on and appeares our gauge is reading correct. called mack and got their pressure stats we are running a lb or two below spec at idle good in mid range and a little over spec on the top. i guess we are just going to run it and try to keep idle time to a minimum Quote Link to comment https://www.bigmacktrucks.com/topic/18500-low-oil-pressure/#findComment-75213 Share on other sites More sharing options...
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