wilbur Posted September 14, 2015 Share Posted September 14, 2015 Its a E7 460 2001 It has 40-50 going down the road but at idle it has 12-14. Put new pump on and the same. Where could it be loosing pressure from? Thanks in advance. Quote Link to comment https://www.bigmacktrucks.com/topic/41793-low-oil-pressure/ Share on other sites More sharing options...
1957B61Vt Posted September 14, 2015 Share Posted September 14, 2015 How many miles?Usually bearings have to much clearance from wear Quote Link to comment https://www.bigmacktrucks.com/topic/41793-low-oil-pressure/#findComment-303841 Share on other sites More sharing options...
Dirtymilkman Posted September 14, 2015 Share Posted September 14, 2015 Isn't there a frost plug in the head somewhere that'll leak oil and lose pressure? Quote Link to comment https://www.bigmacktrucks.com/topic/41793-low-oil-pressure/#findComment-303854 Share on other sites More sharing options...
Mack Doctor Jr. Posted September 15, 2015 Share Posted September 15, 2015 How many miles are on the old girl? Have you done an oil sample? Could have a little cam wear. Quote Link to comment https://www.bigmacktrucks.com/topic/41793-low-oil-pressure/#findComment-303866 Share on other sites More sharing options...
wheeler73 Posted September 15, 2015 Share Posted September 15, 2015 Check the rocker shafts as they have freeze plugs in the ends of them. Also is the oil pressure gauge a mechanical one or electric? If it is electric plumb in a mechanical gauge. Also have seen the freeze plug behind the idler gear for the camshaft come out a couple of times. Quote Link to comment https://www.bigmacktrucks.com/topic/41793-low-oil-pressure/#findComment-303886 Share on other sites More sharing options...
wilbur Posted September 15, 2015 Author Share Posted September 15, 2015 New bearings this past Dec. Also put a mechanical guage an only 5psi higher. Engine has 400,000. The sleeves were leaking an that also was fixed in Dec. along with pistons an rods. Quote Link to comment https://www.bigmacktrucks.com/topic/41793-low-oil-pressure/#findComment-303945 Share on other sites More sharing options...
dogg rescue Posted September 17, 2015 Share Posted September 17, 2015 Does the jake brake work on either or both heads? Quote Link to comment https://www.bigmacktrucks.com/topic/41793-low-oil-pressure/#findComment-304176 Share on other sites More sharing options...
wilbur Posted September 17, 2015 Author Share Posted September 17, 2015 The Jake works but not good. It has the external feed lines from the filter housing. I was thinking one of those came off. I will check it out Sat. Quote Link to comment https://www.bigmacktrucks.com/topic/41793-low-oil-pressure/#findComment-304214 Share on other sites More sharing options...
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