Posted by used red MN on January 16, 2022 at 22:36:04 from (75.73.112.20):
In Reply to: piston damage posted by J Hamilton on January 16, 2022 at 15:54:29:
Quote: CVPost-rustred (quoted from post at 09:28:22 01/17/22) that video is not much... if the wristpin bushings are loose pretty hard to find a straight rod that way! as i said the sun resizing machine will tell u pretty quick. plus as you said if the bearing are worn even across the rod cant be at fault. has to be the piston. if the major thrust side has a crack along with excessive clearance that will be the out come.
You must mean the manufacturer Sunnen, ran one of their connecting rod resizing hones at the Auto, Truck and Machine Shop I worked at in the early 80s. It did not have any way to check the straightness of the rod that is not its purpose, see video in link. Thus we had a fixture very similar to the one shown in the video in my other reply. You would remove the piston from the rod and give an initial check for extreme bending. If the pin was loose you found a proper feeler gauge to hold the pin tight. If that checked good you would grind down the big end cap mating surfaces with a special grinder also built by Sunnen. Torque the rod bolts up in the special rod vise that assured the caps aligned properly then you would run them on the hone as shown checking them periodically for size on the gauging fixture. Then you would fit new bushings in the small end and resize that end to fit the pin. After that the final straighten check was made with a tight fit pin. The Oliver White Waukesha rods were the most rubberish rods that would bend the easiest. And we also had a one piece replacement bushing for the two piece original bushings that were always pounding out. FYI ..Sun.. is a manufacturer of Automotive test equipment ..back in the day they made distributor test machines and oscilloscopes.. they are now a division of Snap-on Tools.
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