Piston Pin Sizes

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Model T Ford Forum: Forum 2014: Piston Pin Sizes
Top of pagePrevious messageNext messageBottom of page Link to this message  By Douglas Dachenbach on Tuesday, December 02, 2014 - 02:08 pm:

I'm back with a question about reamers. It appears that there is two different Piston Pin Bushings (3022 ) for 1909 - 11 and 1911 - 27. Is the piston pin size different or just the O.D. of the bushing? In other words, will the 0.741 reamer properly size either bushing for the piston pin or are there two different reamer sizes?

Doug


Top of pagePrevious messageNext messageBottom of page Link to this message  By Frank van Ekeren (Australia) on Tuesday, December 02, 2014 - 02:48 pm:

My Parts books only list the one bush for all, 3022-1/2.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Ted Dumas on Tuesday, December 02, 2014 - 03:12 pm:

I think the heavier early pistons had a thicker bushing with same wrist pin diameter. It might be less expensive to have a local shop ream the bushings rather than buying a reamer.


Top of pagePrevious messageNext messageBottom of page Link to this message  By joe bell on Tuesday, December 02, 2014 - 03:28 pm:

Never ream a wrist pin bushing they will not last, have them honed to fit.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Ted Dumas on Tuesday, December 02, 2014 - 03:43 pm:

Joe,

Is there a particular problem with Model T wrist pin bushings? My Farmall M wrist pin bushing was reamed to size 30 years ago and is working fine.

Ted


Top of pagePrevious messageNext messageBottom of page Link to this message  By Jerry VanOoteghem on Tuesday, December 02, 2014 - 03:57 pm:

Honing is the best way to accurately size and align the holes and give the best bearing surface. If reaming works well, it's only due to good luck.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Douglas Dachenbach on Tuesday, December 02, 2014 - 03:59 pm:

The thing I noticed in the books is that the piston pin (at least the newer one) is listed as being 0.741 Dia. and the 3022 1/2 piston pin bushing is listed as 0.741 I.D. which is zero clearance. You can control honing to a closer tolerance than with reaming, thus Joe Bell's suggestion. I am trying to find the dimensions of the 30 plus bushings and what the size of the 17 recommended reamers were. I have 11 of the reamers by Keystone but there isn't one with a size, only the bushing #. I'm on an academic quest for the reamer size for an article and possible use some day. Doug


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