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 Specification
Steel Connecting Rods
Titanium Connecting Rods
Part #
Diameter x U.H.Length
PSI
Material
Assembly Lubricant
Bolt Stretch
Torque
Assembly Lube
Bolt Stretch
Torque
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"
20W/50 Motor Oil
.004"-.006"
50 ft lbs
90806
11/32" x 1.940"
20W/50 Motor Oil
.004"-.006"
35 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
90817
5/16" x 1.500"
Crower #90894 *
.005"-.007"
25 ft lbs
Crower Lube #90897
.005"-.007"
25 ft lbs
90818
3/8" x 1.600"
220,000
H-11
Crower #90894 *
.005"-.007"
45 ft lbs
Crower Lube #90897
.005"-.007"
50 ft lbs
90819
3/8" x 1.600"
220,000
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
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
ARP2000
Crower #90894*
.005"-.007"
45 ft lbs
Crower Lube #90897
.005"-.007"
45 ft lbs
90823
7/16" x 1.650"
220,000
H-11
Crower #90894 *
.005"-.007"
75 ft lbs
Crower Lube #90897
.005"-.007"
75 ft lbs
90824
5/16" x 1.500"
220,000
H-11
Crower #90894 *
.005"-.007"
30 ft lbs
Crower Lube #90897
.005"-.007"
35 ft lbs
90824A
5/16" x 1.500"
220,000
ARP2000
Crower #90894 *
.005"-.007"
30 ft lbs
Crower Lube #90897
.005"-.007"
25 ft lbs
90825
7/16" x 1.700"
220,000
H-11
Crower #90894 *
.005"-.007"
75 ft lbs
Crower Lube #90897
.005"-.007"
75 ft lbs
90826
7/16" x 1.540"
220,000
H-11
Crower #90894 *
.005"-.007"
75 ft lbs
Crower Lube #90897
.005"-.007"
75 ft lbs
90826A
7/16" x 1.550"
220,000
ARP2000
Crower #90894 *
.005"-.007"
75 ft lbs
Crower Lube #90987
.005"-.007"
65 ft lbs
90827
3/8" x 1.600"
220,000
H-11
Crower #90894 *
.005"-.007"
45 ft lbs
Crower Lube #90897
.005"-.007"
50 ft lbs
90828
3/8" x 1.600"
180,000
8740
Crower #90894 *
.005"-.007"
45 ft lbs
90829
7/16" x 1.800"
180,000
8740
Crower #90894 *
.005"-.007"
75 ft lbs
90830
7/16" x 1.540"
280,000
AMS
Crower #90894 *
.005"-.007"
95 ft lbs
Crower Lube #90897
.005"-.007"
95 ft lbs
90831
7/16" x 1.700"
280,000
AMS
Crower #90894 *
.005"-.007"
95 ft lbs
Crower Lube #90897
.005"-.007"
95 ft lbs
90832
7/16" x 1.800"
280,000
AMS
Crower #90894 *
.005"-.007"
95 ft lbs
Crower Lube #90897
.005"-.007"
95 ft lbs
90833
7/16" x 1.650"
280,000
AMS
Crower #90894 *
.005"-.007"
95 ft lbs
Crower Lube #90897
.005"-.007"
95 ft lbs
90842
3/8" x 1.600"
280,000
AMS
Crower #90894 *
.005"-.007"
65 ft lbs
Crower Lube #90897
.005"-.007"
50 ft lbs
90845
5/16" x 1.500"
280,000
AMS
Crower #90894 *
.005"-.007"
40 ft lbs
Crower Lube #90897
.005"-.007"
35 ft lbs
90846
7/16" x 1.440"
180,000
8740
20W/50 Motor Oil
.005"-.007"
75 ft lbs
90847
1/4" x 1.375"
280,000
AMS
Crower #90894 *
.005"-.007"
275 in lbs
Crower Lube #90897
.005"-.007"
240 in lbs
90848
7/16" x 1.400"
180,000
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