The Ford Barn

50MercMetalHead · 10-06-2021, 11:07 PM

I’m rebuilding the 8CM out of my 50 merc. I got a new bushing for the idler gear that links the oil pump to the cam, ordered it from Red’s, pressed it in to my existing gear, and it’s too small for the shaft it’s supposed to go on. Inside of the bushing measures .020” smaller than the shaft.

Is there a taper to this bushing that I overlooked and pressed backwards? That’s the only thing I can think of unless the bushing is just wrong? Several sites that list the bushing or the gear say they are for 32-53, but I’ve seen others listed only for 32-48? Is it different for 49-53? There’s nothing wrong with my gear so I didn’t want to replace it, but now I’m considering just buying a new one with a bushing already in it. Would like to maybe get this figured out before I do that.

Any help would be greatly appreciated.

10-06-2021, 11:07 PM	#1
50MercMetalHead Member Join Date: Jul 2021 Location: Minnesota Posts: 31	Oil pump idler gear bushing problems I’m rebuilding the 8CM out of my 50 merc. I got a new bushing for the idler gear that links the oil pump to the cam, ordered it from Red’s, pressed it in to my existing gear, and it’s too small for the shaft it’s supposed to go on. Inside of the bushing measures .020” smaller than the shaft. Is there a taper to this bushing that I overlooked and pressed backwards? That’s the only thing I can think of unless the bushing is just wrong? Several sites that list the bushing or the gear say they are for 32-53, but I’ve seen others listed only for 32-48? Is it different for 49-53? There’s nothing wrong with my gear so I didn’t want to replace it, but now I’m considering just buying a new one with a bushing already in it. Would like to maybe get this figured out before I do that. Any help would be greatly appreciated.