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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) 

Connecting Rod Bolt SpecificationSteel Connecting RodsTitanium Connecting Rods
Part #Diameter x U.H.Length

Tensile Strength

MaterialAssembly LubricantBolt StretchTorqueAssembly LubeBolt StretchTorque
90800 7/16" x 2.000"     Crower #90894 * .005"-.007" 70 ft lbs      
90802 7/16" x 1.700"     20W/50 Motor Oil .004"-.006" 65 ft lbs      
90803 7/16" x 1.940"     20W/50 Motor Oil .004"-.006" 65 ft lbs      
90804 7/16" x 2.320"     20W/50 Motor Oil .004"-.006" 65 ft lbs      
90805 3/8" x 1.920"    ARP 20W/50 Motor Oil .004"-.006" 50 ft lbs      
90807 7/16" x 2.070"     20W/50 Motor Oil .004"-.006" 65 ft lbs      
90809 1/2" x 2.500"     Crower #90894* .005"-.007" 95 ft lbs      
90818 3/8" x 1.600" 220,000 psi H-11 Crower #90894 * .005"-.007" 45 ft lbs Crower Lube #90897 .005"-.007" 45 ft lbs
90819 3/8" x 1.600" 220,000 psi H-11 Crower #90894 * .004"-.006" 45 ft lbs Crower Lube #90897 .005"-.007" 50 ft lbs
90820 7/16" x 1.800" 220,000 psi H-11 Crower #90894 * .005"-.007" 75 ft lbs Crower  Lube #90897 .005"-.007" 75 ft lbs
90821 3/8 x 1.600 220,000 psi ARP2000 Crower #90894* .005"-.007" 45 ft lbs  Crower Lube #90897  .005"-.007"  45 ft lbs
90823 7/16" x 1.650" 220,000 psi H-11 Crower #90894 * .005"-.007" 75 ft lbs Crower Lube #90897 .005"-.007" 75 ft lbs
90824A 5/16" x 1.500" 220,000 psi ARP2000 Crower #90894 * .005"-.007" 30 ft lbs Crower Lube #90897 .005"-.007" 25 ft lbs
90826A 7/16" x 1.550" 220,000 psi ARP2000 Crower #90894 * .005"-.007" 75 ft lbs Crower Lube #90987 .005"-.007" 65 ft lbs
90828 3/8" x 1.600" 180,000 psi 8740 Crower #90894 * .005"-.007" 45 ft lbs      
90829 7/16" x 1.800" 180,000 psi 8740 Crower #90894 * .005"-.007" 75 ft lbs      
90830 7/16" x 1.540" 280,000 psi AMS Crower #90894 * .005"-.007" 95 ft lbs Crower Lube #90897 .005"-.007" 90 ft lbs
90832 7/16" x 1.800" 280,000 psi AMS Crower #90894 * .005"-.007" 95 ft lbs Crower Lube #90897 .005"-.007" 90 ft lbs
90833 7/16" x 1.650" 280,000 psi AMS Crower #90894 * .005"-.007" 95 ft lbs Crower Lube #90897 .005"-.007" 90 ft lbs
90842 3/8" x 1.600" 280,000 psi AMS Crower #90894 * .005"-.007" 65 ft lbs Crower Lube #90897 .005"-.007" 50 ft lbs
90845 5/16" x 1.500" 280,000 psi AMS Crower #90894 * .005"-.007" 45 ft lbs Crower Lube #90897 .005"-.007" 35 ft lbs
90846 7/16" x 1.440" 180,000 psi 8740 20W/50 Motor Oil .005"-.007" 75 ft lbs      
90847 1/4" x 1.375" 280,000 psi AMS Crower #90894 * .005"-.007" 275 in lbs Crower Lube #90897 .005"-.007" 240 in lbs
90848 7/16" x 1.400" 180,000 psi 8740 Crower #90894 * .005"-.007" 75 ft lbs      
* 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 rods@crower.com