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.

cas3 · 10-07-2021, 12:10 AM

A tapered bushing would be a very rare application, not on your ford! Its another example of todays parts that dont fit. Take it to a machine shop and have them ream it to size. should be cheap and quick.

Bored&Stroked · 10-07-2021, 08:05 AM

I had the same issue on one that I recently rebuilt. I had to put the gear in my lathe and increase the ID just a bit. Not a big deal, just a pain to have to do it. It is the nature of many of the parts I receive today - seems I am always firing up my mill or lathe to make things correctly fit.

19Fordy · 10-07-2021, 08:06 AM

Contact Mr. VanPelt. He may have just the bushing.
https://www.vanpeltsalesstore.com/18...ing_p_720.html

Question: When the new gear comes with a bushing installed, does that mean that the bushing has to FIRST be honed so that it fits properly? I am thinking it's a custom fit, like king pin bushings that DO have to be honed or reamed to fit properly.

Ken/Alabama · 10-07-2021, 08:14 AM

Your machine shop can do it with the machine that resizes rods .

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

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Thank for the help guys. I was able to hone it out myself and got it to fit.

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.

10-07-2021, 12:10 AM	#2
cas3 Senior Member Join Date: Jan 2011 Location: sw minnesota Posts: 4,567	Re: Oil pump idler gear bushing problems A tapered bushing would be a very rare application, not on your ford! Its another example of todays parts that dont fit. Take it to a machine shop and have them ream it to size. should be cheap and quick. Last edited by cas3; 10-07-2021 at 12:16 AM. Reason: add

10-07-2021, 08:05 AM	#3
Bored&Stroked Senior Member Join Date: Jan 2011 Location: Central Ohio Posts: 5,062	Re: Oil pump idler gear bushing problems I had the same issue on one that I recently rebuilt. I had to put the gear in my lathe and increase the ID just a bit. Not a big deal, just a pain to have to do it. It is the nature of many of the parts I receive today - seems I am always firing up my mill or lathe to make things correctly fit.

10-07-2021, 08:06 AM	#4
19Fordy Senior Member Join Date: May 2010 Location: Coral Springs FL Posts: 10,921	Re: Oil pump idler gear bushing problems Contact Mr. VanPelt. He may have just the bushing. https://www.vanpeltsalesstore.com/18...ing_p_720.html Question: When the new gear comes with a bushing installed, does that mean that the bushing has to FIRST be honed so that it fits properly? I am thinking it's a custom fit, like king pin bushings that DO have to be honed or reamed to fit properly. Last edited by 19Fordy; 10-07-2021 at 08:54 AM.

10-07-2021, 08:14 AM	#5
Ken/Alabama Senior Member Join Date: May 2010 Location: Alabama Posts: 3,257	Re: Oil pump idler gear bushing problems Your machine shop can do it with the machine that resizes rods .

10-07-2021, 06:10 PM	#6
50MercMetalHead Member Join Date: Jul 2021 Location: Minnesota Posts: 31	Re: Oil pump idler gear bushing problems Sponsored Links (Register now to hide all advertisements) Thank for the help guys. I was able to hone it out myself and got it to fit.