Connecting rod cotter pins

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jwrightjr
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Connecting rod cotter pins

Post by jwrightjr » Fri Jul 01, 2022 7:17 pm

Just took the inspection cover off the bottom of a new to me Roadster. We suspected the motor was rebuilt and never ran. Stuck bore scope into head and no evidence it was started just shiny .20 over pistons. Looks like it has a reground crank and cam as well with new valves, hardened seats, adjustable lifters and new Babbitt. There are dippers installed but no cotter pins on the rod nuts. The tabs on the dippers are bent over to the flats on the nuts.....except on #1 which has the tabs bent and cotter pins installed. Is this regular practice instead of using pins or should I straighten them, retorque and install pins? Thanks for any advice. :?:
Kind Regards
John

1922 Touring "Tinker"
1925 Roadster "Pops" (Pile Of Parts)
Martin, Ohio

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JTT3
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Re: Connecting rod cotter pins

Post by JTT3 » Fri Jul 01, 2022 7:46 pm

Yes on cotter pins.


Jerry VanOoteghem
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Re: Connecting rod cotter pins

Post by Jerry VanOoteghem » Fri Jul 01, 2022 7:50 pm

JTT3 wrote:
Fri Jul 01, 2022 7:46 pm
Yes on cotter pins.

Ditto!

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Craig Leach
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Re: Connecting rod cotter pins

Post by Craig Leach » Fri Jul 01, 2022 8:42 pm

Hi John,
Do the holes line up for the bolt & nut? if they don't you have no choice but to bend the tabs & tighten until the holes line up. If the rod bolts are Chevy and have no holes remove castellated nuts & get Chevy nuts & torque to Chevy specs. or replace the rod bolts & nuts. and no that's not common practice as far as I know.
Craig.


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Re: Connecting rod cotter pins

Post by Allan » Sat Jul 02, 2022 9:01 am

You can make the split pin holes line up with the castelations by sanding the back face of the nut on a flat surface. Do it a little at a time. When the required tension is reached and the holes line up, fit your pins. I have never seen the dippers used as locking devices either, although it is common practice on other vehicles.

Allan from down under.


Original Smith
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Re: Connecting rod cotter pins

Post by Original Smith » Mon Jul 04, 2022 11:54 am

When all else fails, do it the way Ford says to.

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jwrightjr
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Re: Connecting rod cotter pins

Post by jwrightjr » Mon Jul 04, 2022 10:42 pm

Going to pull the engine tomorrow for painting. I am going to straighten the dipper tabs and torque the nuts and install the pins. I think I read they should be 30-35 ft lbs but need to confirm that. Thanks again for everyone's advice.
Kind Regards
John

1922 Touring "Tinker"
1925 Roadster "Pops" (Pile Of Parts)
Martin, Ohio

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Mark Gregush
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Re: Connecting rod cotter pins

Post by Mark Gregush » Mon Jul 04, 2022 10:47 pm

Yes on the 35. Model A, same. Check for pulled thread.
I know the voices aren't real but damn they have some good ideas! :shock:

1925 Cut down pickup
1920 Dodge touring
1948 Ford F2 pickup

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