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Ford 9N, 2N & 8N Discussion Forum
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Oil Pump Rebuild

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Rick

10-19-2003 17:55:28




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I just finished rebuilding my oil pump with new shaft, gears, and bushing. Bushing was reamed. I can turn the gear by hand (without the use of a rag), but it is tight. If it were any tighter, I would have to use a rag to turn it. I observed that it gets tight just at the points where the two gears mesh into each other. Is it ok that it's so tight? Thanks for all of the help!
Rick




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Bob - MI

10-20-2003 07:54:22




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 Re: Oil Pump Rebuild in reply to Rick, 10-19-2003 17:55:28  
Rick,

Sounds like the bushing is off-set to the desired centerline of the 2 gear shafts. Does the shaft turn freely with only one gear installed? If so, it is not an issue of size but one of location. Another response mentioned the possibility that the hole isn't straight and I would also agree that could be the issue. Think about how the gear mesh process works, the ideal condition is that there is 100% contact along the face of the teeth so they are constantly loaded as they rotate and each tooth hands off the load to the next and on and on...

A simple way to determine if bore straightness is an issue is to mark up ONE of the gears with a grease pencil or crayon. With a not-too-thick layer, re-assemble and rotate then pull apart and look at the contact pattern on the non-marked gear. Should show contact evenly along the width of the tooth. If very localized, re-bush and bore or ream straight. If reaming, high speed and low feed will give the straightest diameter. Be careful not to allow chatter however. Oil the reamer for best results. Be careful using sandpaper to hone things out you can get the hole out-of round and bell-mouthed pretty quickly.

While you have the assembly apart check to make sure the shaft isn't bent. This would cause the same condition and would show up as inconsistent loading via the crayon approach.

Best of luck

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Rich, NJ

10-20-2003 07:26:43




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 Re: Oil Pump Rebuild in reply to Rick, 10-19-2003 17:55:28  
Just for the record, Any 9/16 ths (.562)reamer should do. As long as it cuts on size. Slow speed,
Slow feed and some oil should do the trick. Regards, Rich



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Hobo,NC

10-20-2003 04:42:05




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 Re: Oil Pump Rebuild in reply to Rick, 10-19-2003 17:55:28  
theirs no better time than now to fix it right.
eather have the bushing reamed or try and reame it your self. you are at the point were it sounds like it will not take much to get it to turn free. Split a bolt and slid a piece of emery cloth sand paper (fine grit) and chuck it in a drill and run it threw it a little to cut the bushing down or run it down to a machine shop and have them reame it. Its in your hand now so get it turning free now.

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OK-AL

10-19-2003 21:39:54




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 Re: Oil Pump Rebuild in reply to Rick, 10-19-2003 17:55:28  
I had the same problem when I rebuilt my oil pump. I reamed the bushing myself. I took it to an auto machinest who said that it was too tight. He installed and reamed a new bushing and when he was through, you could turn the shaft with NO binding whatsoever.

FYI, I have also purchased a brand-new oil pump from New Holland for my 8N. The gears turn without any binding whatsoever.

It sounds like your bushing hasn't been reamed straight. The only way that I know to fix this is to replace the bushing.

OK-AL

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Jeb2N

10-19-2003 19:11:25




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 Re: Oil Pump Rebuild in reply to Rick, 10-19-2003 17:55:28  
I would think that it's okay. You want a good seal around the shaft especially so that the 50 psi doesn't force it's way out through the shaft hole. Remember, you not only have to seal the edges of the gears and the shaft, but the entire sides of both gears to prevent the oil from leaking.

Just out of curiosity, did you buy the reamer kit thing for ~$95 or did you just take it to somebody and have them ream it for you?

Jeb

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Rick

10-20-2003 04:28:17




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 Re: Re: Oil Pump Rebuild in reply to Jeb2N, 10-19-2003 19:11:25  
Jeb,
Yes, I did purchase one of those reamer kits. It was a piece of junk! The jig was not bored straight (unbeknown to me)so when I reamed, the reamer ate up half of the bushing. I sent it back, received another one, checked it out first and found the same defect. I finally gave the whole thing to an aircraft engine mechanic friend. He took it to his shop to ream. Forget using that kit. It even looks like junk when it's new!
Rick

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