The Ford Barn

Terry, NJ · 12-25-2012, 07:04 AM

I aquired an engine with a .040 overbore that needed valve work. Cool! decided to change rings and plastigauge the journals. More a refreshment than a rebuild. So far everything's look good except for one piston's wrist pin. It's loose and sloppy, clearly needs replacing. Also, I don't like the pistons, too low a deck height. Things aren't right with them. So I want to get a new set of pistons and rods. Unless the wrist pins are all a standard dia. and I can just change them. This is kind of a dilema, do I have to change the rods too and refit the rod bearings? Or can I just rebush the wristpins and use the old rods? How standard are they, how much variation is there in the wrist pin diameters? Thanks in advance.
Terry

James Rogers · 12-25-2012, 07:12 AM

If the wrist pin is loose in the piston,just replace the pistons. If the wrist pin is loose in the rod, you have 2 choices. One you can replace the rods or, you can replace the bushing in the one rod and hone it to fit. If the pin is loose in both, I would replace both rods and pistons. To replace the bushing, you could send the one rod to me and I can install a new one and fit it to the pin.

Terry, NJ · 12-25-2012, 09:06 AM

Sorry for the double post! Thanks for the offer, James. It is appreciated. However I have two presses that will be adequate. I'll make an installation tool, mandel, plug etc and a brass hone. I will use my drill press to turn the hone. This should be adequate for a one time deal. Thanks again! Oh Yeah, You wouldn't have an old set of .040 pistons that are good would you? I really don't like these.
Terry

James Rogers · 12-25-2012, 10:53 AM

I'll look later today

JoeWay · 12-25-2012, 02:58 PM

Quote:

Originally Posted by Terry, NJ

...Oh Yeah, You wouldn't have an old set of .040 pistons that are good would you? I really don't like these.
Terry

Terry,

See my reply to your other post.

Joe

columbiA · 12-26-2012, 12:16 AM

Sponsored Links (Register now to hide all advertisements)

On the last engine I overhauled,I replaced the wrist pins with .003 OS ones & honed them on my Sunnen pin hone.

12-25-2012, 07:04 AM	#1
Terry, NJ Senior Member Join Date: May 2010 Location: Bucks Co, Pa Posts: 3,740	Looking for a cheap fix, (Pistons) I aquired an engine with a .040 overbore that needed valve work. Cool! decided to change rings and plastigauge the journals. More a refreshment than a rebuild. So far everything's look good except for one piston's wrist pin. It's loose and sloppy, clearly needs replacing. Also, I don't like the pistons, too low a deck height. Things aren't right with them. So I want to get a new set of pistons and rods. Unless the wrist pins are all a standard dia. and I can just change them. This is kind of a dilema, do I have to change the rods too and refit the rod bearings? Or can I just rebush the wristpins and use the old rods? How standard are they, how much variation is there in the wrist pin diameters? Thanks in advance. Terry

12-25-2012, 07:12 AM	#2
James Rogers Senior Member Join Date: May 2010 Location: Asheville,NC Posts: 3,104	Re: Looking for a cheap fix, (Pistons) If the wrist pin is loose in the piston,just replace the pistons. If the wrist pin is loose in the rod, you have 2 choices. One you can replace the rods or, you can replace the bushing in the one rod and hone it to fit. If the pin is loose in both, I would replace both rods and pistons. To replace the bushing, you could send the one rod to me and I can install a new one and fit it to the pin. __________________ http://www.model-a-ford-4bangers.com/

12-25-2012, 09:06 AM	#3
Terry, NJ Senior Member Join Date: May 2010 Location: Bucks Co, Pa Posts: 3,740	Re: Looking for a cheap fix, (Pistons) Sorry for the double post! Thanks for the offer, James. It is appreciated. However I have two presses that will be adequate. I'll make an installation tool, mandel, plug etc and a brass hone. I will use my drill press to turn the hone. This should be adequate for a one time deal. Thanks again! Oh Yeah, You wouldn't have an old set of .040 pistons that are good would you? I really don't like these. Terry Last edited by Terry, NJ; 12-25-2012 at 09:12 AM.

12-25-2012, 10:53 AM	#4
James Rogers Senior Member Join Date: May 2010 Location: Asheville,NC Posts: 3,104	Re: Looking for a cheap fix, (Pistons) I'll look later today __________________ http://www.model-a-ford-4bangers.com/

12-26-2012, 12:16 AM	#6
columbiA Senior Member Join Date: Nov 2011 Location: B.C. Canada Posts: 1,746	Re: Looking for a cheap fix, (Pistons) Sponsored Links (Register now to hide all advertisements) On the last engine I overhauled,I replaced the wrist pins with .003 OS ones & honed them on my Sunnen pin hone.