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Antique Steel Wheel Tractors - Old Iron Lugs and Cleats

18-36 Hart Parr ConRod Cracks


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  #21  
Old 08-20-2019, 03:23:19 PM
halcon halcon is offline
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Default Re: 18-36 Hart Parr ConRod Cracks

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Originally Posted by Duey C View Post
How many other running/working Hart-Parr rods have these very same cracks is my noodling? Very interesting thread rat!
My guess is that it stayed in the forging dies a little too long which restricted it from contracting. as it cooled. In that day those billets and forged parts were handled by hand and were not extracted with automated precision as now. That aria is where a check would occur, Take a good look at the other end where the I beam section joins the bearing saddle, there might be an other one there.
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  #22  
Old 08-20-2019, 04:09:00 PM
Andrew Mackey Andrew Mackey is offline
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Default Re: 18-36 Hart Parr ConRod Cracks

How do you intend to fix the cracks - weld or braze, replace?
Andrew
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Old 08-20-2019, 08:31:20 PM
David Hoover David Hoover is offline
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Default Re: 18-36 Hart Parr ConRod Cracks

Journal dia 3.5. Width 3.25. Looks like 16 1/2 from centre of pin to centre of thro. Haven’t got a spare clutch fork or belt pulley have you Jeff, I need both.
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Old 08-20-2019, 09:48:22 PM
Oilpulled Oilpulled is offline
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Default Re: 18-36 Hart Parr ConRod Cracks

Is there any history of previous owner or repair done?
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Old 08-24-2019, 12:23:07 PM
steelwheelrat steelwheelrat is offline
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Default Re: 18-36 Hart Parr ConRod Cracks

Dont know the actual history of the rods aside from they came out of Canada with a pile of parts in the 90's. There are no signs of previous repair on either rod but both rods show signs of a failure in the rotating assembly at some point. One rod and cap was punch marked with 3 dimples and the other was marked with 4.

BOTH rods are cracked in the same place identically. The same single flange is cracked on both rods.

The repair is complete. I checked hardness on both rods and neither were hard indicating a lack of abnormal heat treating or an odd alloy. I excavated to the bottom of the crack and tig welded them back with er70s filler rod. Both rods were normalized at 450 degrees with a 2 hour soak.
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Old 08-24-2019, 05:29:24 PM
Oilpulled Oilpulled is offline
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Default Re: 18-36 Hart Parr ConRod Cracks

With cracks like that a good idea is to cut (slice) on each side and remove a piece with the crack undisturbed. Then examine the fractured surfaces with low powered magnification and look for fatigue striations. This will tell you if it was a one time failure or if it was a fatigue occurring over a number of cycles possibly at less than the yield point.
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