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    • #57183

      I am in the process of making my Series IV drivable and would like to know what the proper valve clearances should be set when cold. The only specifications that I have found are for a hot engine. There must be, I hope, specifications when rebuilding the engine prior to running it.

    • #62378

      No, you need to do your valve adjustment when the engine is HOT, because of the thermal properties of the aluminum head (expansion/contraction). Thus why you don’t find specs for COLD settings. (If you had a cast iron head, this wouldn’t apply.)

      Exactly what did you do with your motor – complete rebuild? I would hook everything up, start it, run it for 3-5 minutes (to operating temp), then readjust your valves AND retorque the head. Always an anxious moment; helps to have a buddy near by for moral support…and a Guinness to quell the nerves!

    • #63543

      The initial cold setting is .002 larger than the hot setting. After running for 20 minutes or so then re-adjust to the hot setting. Before you re-adjust measure the clearance and you’ll see that most of the extra clearance has disappeared.

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