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Interesting topic! In my archives I have several socalled Rider's Reports on the CB500/550 published back then in then a weekly (!) motormagazine. In these articles were the typical complaints listed that CB500/550 owners met during many years and kilometers. High on the list were the plugcaps. Also high was the almost inevitable sweating of oil at the head gasket. In one of these articles the chief mechanic of Honda Netherlands, the man at the importer that instructs the dealers, gave his advice. Before tightening the head nuts, he advised to oil the washers somewhat with Molykote and then torque down to the original torque values prescribed in the Shop Manual. Can anyone explain how this can be benificial? I always thought torquening bolts/nuts using grease is a no-no. Now here the advice concerns the washers, but still I would like to know.
Quote from: deltarider on September 05, 2019, 12:46:09 PMInteresting topic! In my archives I have several socalled Rider's Reports on the CB500/550 published back then in then a weekly (!) motormagazine. In these articles were the typical complaints listed that CB500/550 owners met during many years and kilometers. High on the list were the plugcaps. Also high was the almost inevitable sweating of oil at the head gasket. In one of these articles the chief mechanic of Honda Netherlands, the man at the importer that instructs the dealers, gave his advice. Before tightening the head nuts, he advised to oil the washers somewhat with Molykote and then torque down to the original torque values prescribed in the Shop Manual. Can anyone explain how this can be benificial? I always thought torquening bolts/nuts using grease is a no-no. Now here the advice concerns the washers, but still I would like to know.Torque figures are usually given for dry threads UNLESS it's stated to use a specific lubricant. Torque wrench effectively measures friction (rotary in this case) so placing a lubricant on the washer and using the same torque setting figure will then stretch the stud more than without lubrication. A higher clamping pressure in applied, as long as the tensile strength of the stud is not breached. It's a more involved topic for such a simple action than is generally realised, we could do a thread on that if wanted.
Torque figures are usually given for dry threads UNLESS it's stated to use a specific lubricant. Torque wrench effectively measures friction (rotary in this case) so placing a lubricant on the washer and using the same torque setting figure will then stretch the stud more than without lubrication. A higher clamping pressure in applied, as long as the tensile strength of the stud is not breached. It's a more involved topic for such a simple action than is generally realised, we could do a thread on that if wanted.
Does anyone have an answer to my original question? ThanksBill W.