Rod Bolt Stretch & Torque Specifications
The following information is vital for the proper connecting rod assembly installation:
- 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.
*IMPORTANT* DO NOT EXCEED THE TORQUE AMOUNT SHOWN BELOW FOR EACH BOLT PART NUMBER AND ITS RECOMMENDED LUBRICATION (If you are using lubrication other than shown below, a stretch gauge must be used)
- * Note: Crower #90894 is ARP Ultra Torque Lubricant . Not all bolts listed are currently available.
- STEP 3:
- Taking the necessary precautions to protect the rod surfaces, secure the rod in a vise and leave the cap free to float. If the rod is titanium, take extra precautions to avoid damaging the plasma coating on the big end sides of the rod.
- STEP 4:
- Apply a liberal amount of the recommended assembly lubricant to the bolt's threads and under the head of the bolt (the underside of the bolt's head).
- STEP 5:
- (Use Stretch Method to determine exact torque) Since it is near impossible to use a stretch gauge when installing rods inside the motor, please use the following method to determine the exact torque that your wrench will read when the correct stretch is achieved. Using the above table, torque the rod bolts to achieve the required amount of stretch for your application. Record this torque spec as this is the exact torque spec that you will be using to install your rods in the motor.
- STEP 6:
- (Torquing the bolt) When tightening bolts, especially in titanium rods it is best to torque all bolts to 20% of the total required torque and then in one smooth motion torque the bolt to the final torque spec without stopping.
Torquing 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. We can make most used rods like new again, replace bolts, replace bushings, resize them, respray the plasma on Titanium rods and freshen them up as needed. If you have any questions as to the durability and application of your rods or whether it is time to rebuild or replace them, please call our tech line at (619) 661-6477 or email us at email@example.com