The Ford Barn

hotrodcbx · 04-08-2017, 06:09 PM

I did a mild rebuild on my 8ba. Nothing too in depth as the engine looked in excellent shape. I also installed a new Melling m15 high volume oil pump. The engine has been run for 2 hours and showed good oil pressure, 20 at idle, 50 at 2000 rpm. During tuning the oil pressure dropped to zero. I shut it off and did problem diagnosis which showed nothing coming in to main oil gallery. I dropped the pan and removed the oil pump only to find the shaft had snapped about 2 inches up from the drive gear. The shaft was not twisted, the gears looked good and there was no sign of a jam in the housing. I am an engineer but not a metalergist so to my eye the break looked clean and somewhat concave at the break. I am putting it down to a flaw in the metal itself. I would think the drive gear pin would fail first if there was in fact a jam. Anyone had this happen??? Thanks...Doug

04-08-2017, 06:09 PM	#1
hotrodcbx Senior Member Join Date: Jul 2010 Posts: 138	Oil pump shaft I did a mild rebuild on my 8ba. Nothing too in depth as the engine looked in excellent shape. I also installed a new Melling m15 high volume oil pump. The engine has been run for 2 hours and showed good oil pressure, 20 at idle, 50 at 2000 rpm. During tuning the oil pressure dropped to zero. I shut it off and did problem diagnosis which showed nothing coming in to main oil gallery. I dropped the pan and removed the oil pump only to find the shaft had snapped about 2 inches up from the drive gear. The shaft was not twisted, the gears looked good and there was no sign of a jam in the housing. I am an engineer but not a metalergist so to my eye the break looked clean and somewhat concave at the break. I am putting it down to a flaw in the metal itself. I would think the drive gear pin would fail first if there was in fact a jam. Anyone had this happen??? Thanks...Doug