BradK Posted January 22, 2010 Share Posted January 22, 2010 I've got a '99 7.3 with low(7psi) oil pressure at idle, about 1300rpm and the pressure comes up nicely to 30 psi. No debris in filter,pressure relief is clean, gerotors look good, check valve is ok, runs fine, idiot light comes on???? Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted January 22, 2010 Share Posted January 22, 2010 30 PSI is still a little low off idle. You said you inspected the gerotor pump... but did you check it by performing the clearance test both gear clearance and in the housing? Quote Link to comment Share on other sites More sharing options...
BradK Posted January 22, 2010 Author Share Posted January 22, 2010 Clearance height and fit are in spec Quote Link to comment Share on other sites More sharing options...
BradK Posted January 22, 2010 Author Share Posted January 22, 2010 Unable to find a spec for inner to outer as in your pic Kieth Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted January 22, 2010 Share Posted January 22, 2010 It is in the shop manual... 0.028" - 0.032" for the clearance shown above. Quote Link to comment Share on other sites More sharing options...
BradK Posted January 22, 2010 Author Share Posted January 22, 2010 The inner to outer gerotor clearance is .005" on this set. The spec you listed is outer gerotor to housing S/M page 303-01C. Pretty sure its not the pump,but thanks. Quote Link to comment Share on other sites More sharing options...
Bruce Amacker Posted January 23, 2010 Share Posted January 23, 2010 Brad's right, the outer gear to housing is really loose, .030". The clearance between the gears may not be a spec but .005" sounds pretty good, but I've measured them closer. I'd change the pump anyway as they are not a low failure rate unit and many times they look "fine" but replacing them fixes the problem. I'd pressurize the oil galley with shop air and chase what sounds the loudest, but this may be a difficult procedure. Are there any complaints besides the oil light, like oil usage, smoking, noises, etc? The pickup tube in the pan could be cracked, but usually there would be an aeration complaint (unstable ICP and stalling). I wonder if a few piston coolers missing would do this, as they break off commonly and are discarded by the LOF guy. I'd pull the drain plug and look for them. Also 7psi seems a bit high for the OPS, I might try another sender. I remember the spec at 3-6 or 4-6 or something. Has it had an LOF recently? IH Specs: Lubricating Oil Pump Type Gerotor End Clearance - inner and outer rotor to housing 0.02-0.08 mm (0.001-0.003 in) Radial clearance between outer rotor housing 0.71-0.81 mm (0.28-0.32 in) Engine Lube Oil Pressure at Operating Temperature At low idle speed (700 rpm) minimum 83 kPa (12 psi) At high idle speed 276-345 kPa (40-50 psi) Good Luck! Quote Link to comment Share on other sites More sharing options...
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