The Ford Barn

JimKrejci · 10-24-2015, 02:51 PM

I am replacing all pistons and rings on my 1929 Roadster. I have one connecting rod with a stripped stud. Can I replace the one rod with original type or should I replace all four? Thanks for advice!

JimKrejci

Russell in Tulsa · 10-24-2015, 03:36 PM

I understand all rod/piston weights need to be the same. Check with members in your club (you do belong to a club don't you) to see if they have extra rods to be able to find one the sane weight. Others will chime in for the "official" answer.

kenparker · 10-24-2015, 06:36 PM

If you are going to try to replace only one rod, Not only should your rods be weights matched, And that includes weighing both ends of the rod, then the complete rod, you will also have to contend with getting the babbit diameter the right size to fit the crankshaft. Finding one to match what you already have will be next to impossible. Worth a try though.

Big hammer · 10-24-2015, 08:53 PM

Can the stripped stud be replaced? Maybe some engine rebuilders will chime in

JimKrejci · 10-27-2015, 11:47 AM

Thanks for your help. I've decided to replace all the rods!

Kevin in NJ · 10-27-2015, 11:57 AM

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Keep in mind that the original factory rods were constructed to a certain weight +-1 gram at each end.

They were mated to a piston and sorted such that any 4 units pulled from a bin with be within 4 grams of each other.

Then consider the precision construction of the crank shaft and how well it was balanced. Items like the flywheel was under .001" from the center line of the crank. I mention this because all too frequently the cranks are not ground properly with even the center lines of the mains being off center from each other.

You are this far apart already. A little extra attention to details can produce an engine that has more power and is much smoother.

Also consider what you have for a cam. A reground cam or a "good' used cam may not compare to what a well ground new cam might give you.

Anyway just some thought. The checking and balancing is likely just to cost you some time and a little bit of money (assuming you do not find something bad).

10-24-2015, 02:51 PM	#1
JimKrejci Junior Member Join Date: Aug 2015 Posts: 27	Connecting Rods question I am replacing all pistons and rings on my 1929 Roadster. I have one connecting rod with a stripped stud. Can I replace the one rod with original type or should I replace all four? Thanks for advice! JimKrejci

10-24-2015, 03:36 PM	#2
Russell in Tulsa Senior Member Join Date: May 2010 Location: Tulsa Oklahoma Posts: 298	Re: Connecting Rods question I understand all rod/piston weights need to be the same. Check with members in your club (you do belong to a club don't you) to see if they have extra rods to be able to find one the sane weight. Others will chime in for the "official" answer.

10-24-2015, 06:36 PM	#3
kenparker Senior Member Join Date: May 2010 Location: Van, Texas Posts: 1,122	Re: Connecting Rods question If you are going to try to replace only one rod, Not only should your rods be weights matched, And that includes weighing both ends of the rod, then the complete rod, you will also have to contend with getting the babbit diameter the right size to fit the crankshaft. Finding one to match what you already have will be next to impossible. Worth a try though.

10-24-2015, 08:53 PM	#4
Big hammer Senior Member Join Date: Jun 2014 Location: Land of Lincoln Posts: 3,132	Re: Connecting Rods question Can the stripped stud be replaced? Maybe some engine rebuilders will chime in

10-27-2015, 11:47 AM	#5
JimKrejci Junior Member Join Date: Aug 2015 Posts: 27	Re: Connecting Rods question Thanks for your help. I've decided to replace all the rods!

10-27-2015, 11:57 AM	#6
Kevin in NJ Senior Member Join Date: May 2010 Location: South East NJ Posts: 3,398	Re: Connecting Rods question Sponsored Links (Register now to hide all advertisements) Keep in mind that the original factory rods were constructed to a certain weight +-1 gram at each end. They were mated to a piston and sorted such that any 4 units pulled from a bin with be within 4 grams of each other. Then consider the precision construction of the crank shaft and how well it was balanced. Items like the flywheel was under .001" from the center line of the crank. I mention this because all too frequently the cranks are not ground properly with even the center lines of the mains being off center from each other. You are this far apart already. A little extra attention to details can produce an engine that has more power and is much smoother. Also consider what you have for a cam. A reground cam or a "good' used cam may not compare to what a well ground new cam might give you. Anyway just some thought. The checking and balancing is likely just to cost you some time and a little bit of money (assuming you do not find something bad).