How do you match connecting rods and caps?
Try each cap on each rod until you find the one that fits right. You’ll probably have to torque them to make sure. When they’re right, you won’t feel the parting line between cap and rod, both in the bore and on the sides (thrust surface).
Are connecting rod caps interchangeable?
Connecting rods and caps must remain a matched set. Since the caps are matched with their corresponding connecting rods, it’s essential to keep the caps in order during disassembly. That’s why, if no number is stamped, a mark with the cylinder’s corresponding number is made by the technician.
Can you reuse rod cap bolts?
Yes. As long as the fasteners have been installed and torqued correctly, and show no visible signs of damage, they can be re-used. If they show any signs of thread galling or corrosion, they should be replaced. In the case of rod bolts, if any of them have taken a permanent set and have stretched by .
What happens if you mix up rod caps?
Mix up the bearing caps and the crankshaft will sieze up when the bolts are tightened. The fix for this misadventure is not particuarly difficult, just takes a little head scratching, and it’s not so tough with a 4-cylinder engine.
Why are connecting rods marked?
Use of a connecting rod stamped with an S will ensure that the weight match between rods is always within the tolerance allowed by the Lycoming specification for that particular part number. This service instruction shows that certain piston part numbers are designed to fall within a specified standard weight range.
Do you need to replace rod bolts?
Do I need to replace connecting rod bolts? You don’t have to replace them. But if you are going to be doing any after market parts to raise the horsepower then it isn’t all that much more for some new nuts and bolts. As for replacing the connecting rod bolts you just need a vise and a brass hammer.
How to determine the torque of a connecting rod?
STEP 1: Your Crower connecting rods came with a connecting rod specification tag. Check the tag to find the rod bolt part number used to fasten your connecting rods. Rod bolt length listed here is the measurement from under the head to the end. STEP 2: Use the chart below to determine the recommended lubricant, rod bolt stretch and torque amounts.
Is it OK to tighten a rod cap by torque?
“Tightening the fasteners by torque value alone is not an acceptable method for installing the rod cap and should never be used. Since torque value is only measuring the resistance to turning, lube amount and type can introduce too many variables to make sure that the fastener is properly preloaded,” says Skeen.
Do you have to torque your rod bolts?
Torqueing your rod bolts without pre-determining the required torque to achieve the correct rod bolt stretch is not recommended. However if this is the only tightening method available to you, DO NOT EXCEED THE TORQUE AMOUNT INDICATED FOR YOUR BOLTS. NOTE: Your Crowerods are totally rebuildable.
What’s the best way to install rod caps?
“Although stretch is the recommended method of securing the fasteners when installing the rod caps, we do offer specifications for torque + angle tightening. This method requires a small initial torque, followed by a specific number of degrees and relies on the precise pitch of the threads to properly stretch the fastener,” says Skeen.