Topic: oil return tube and cotter keys on brgs


stephen miller    -- 05-10-2013 @ 5:48 PM
  I bought a '35 21 stud engine that was rebuilt 35 years ago. It has not been installed. Pulled pan, the oil return line on the rear main was missing; a new oil pump was installed and it looks like the suction line would interfere. It looks like the oil would run out and right into the pan anyway. Question: is it necessary to have that line on there?
Next question: the cotter keys on the rods and mains have not been installed. Is it necessary to key them? Thank you.


supereal    -- 05-11-2013 @ 10:38 AM
  Whether the rear main bearing cap has an oil pipe usually depends on whether your engine is a babbit type, or has insert bearings. The intent was to provide a convenient way for the oil to leave the bearing, rather than seep out around the seal or slinger, depending upon the year of the engine. The pipe would conduct the oil to the pan, and reduce oil aeration. Many oil pipes were lost or removed over the years, and didn't seem to make a major difference. It may have been removed when the oil pump was changed to prevent interference with the pickup. As to your question regarding connecting rod nuts, if your engine has the "castellated" nuts, they should be torqued to 35-40 Ft Lbs and secured with cotter pins. If you have self-locking nuts (without a pin hole), torque them to 40-45 ft lbs, and no cotters are required.


stephen miller    -- 05-11-2013 @ 12:14 PM
  thank you for the information appreciate the response


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