Club Rod Big End Bolts
Posted: Thu Mar 16, 2023 4:51 pm
I am just about to fit a set of the latest batch of club rods to a mark two engine that I am building. When I was going through the recommended five times tightening and loosening procedure before installation I noticed that when the bolts were fully tightened to the recommended torque of 26 ft/lbs the bolt stretch was only about .004 instead of the .005 to .0055 as was mentioned in the instructions that came with the rods.
I am using a nearly new Britool torque wrench and a Moore and Wright micrometer, so they both should be reasonably accurate.
So the question is do I go for final assembly with the 24 ft/lbs of torque with the torque wrench as recommended in the instructions, or should I tighten the bolts more than this in order to achieve the .005 thou bolt stretch, again as stated in the instructions.
Has anyone else encountered this, and if so which of the two alternative methods did you use, only if I get this wrong it could be disastrous.
As usual any advice would be much appreciated.
I am using a nearly new Britool torque wrench and a Moore and Wright micrometer, so they both should be reasonably accurate.
So the question is do I go for final assembly with the 24 ft/lbs of torque with the torque wrench as recommended in the instructions, or should I tighten the bolts more than this in order to achieve the .005 thou bolt stretch, again as stated in the instructions.
Has anyone else encountered this, and if so which of the two alternative methods did you use, only if I get this wrong it could be disastrous.
As usual any advice would be much appreciated.