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good running e7 low oil pressure at idle



just bought this 1994 dump with e7 400  the thing runs excellent,no blowby,no smoke pulls great, oil pressure 56lbs at 1650 but at idle 8 lbs bump it to 800 rpm and its 30lbs ,,,oil pump??? already changed filter,oil,and put manual gauge on it,,,????

Edited by dickey
not enough info
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Pull pan, pull oil pump, disassemble, Check oil relief plunger and seat for galling. If it’s galled too bad replace, otherwise clean it up. Check pump rotating group, of gears pass inspection install it. 

Mid pump looks good pull a rod and a main to check bearings. 

Edited by Mack Technician
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