ARC +.020 long billet rod with bearing inserts for the Harbor Freight Predator 212cc engine.
Fits both the Hemi and non-Hemi versions. 3.328" center-to-center for a 1.188-rod journal and .709" wrist pin. The +.020" length is for use with the stock crankshaft and stock style (dished or flat top) piston to lessen the piston's "in the hole" depth. It is built from 7075-T651 aircraft-grade aluminum. It uses ARC's custom-manufactured bearing inserts and ARP rod bolts, which are manufactured specifically for ARC. ARC has the only forced oiling scoop dipper rods available for these engines, which provide superior lubrication at the bearing journal.
Rod bolt torque: 170 in/lbs lubricated
Installation Instructions:
You will need a 12-point 1/4" socket and a QUALITY inch-pound torque wrench to install your ARC rod. You will also need an outside micrometer, dial bore gauge or plastic-gauge, and oil.
Measure the crankpin diameter with the outside mic; it should measure 1.188" +/-.0005". Measure in several spots to ensure roundness. It probably should be replaced if out of round more than .0005". The crankpin finish should be smooth to the touch.
When disassembling the rod, notice that on the side with the part number, there are two dots next to the beam and cap's separation point. These dots help to reorient the cap and beam when assembled. The side of the rod with the part number engraved will always face the side cover side.
Ensure the bearing and rod serrations are clean, and install the bearings. Lubricate the rod bolt threads, and hand tighten the bolts. Tighten the bolts to 60" lbs using the torque wrench. Alternate on each side to increase the torque by 20" lbs until you reach 150" lbs. Then, loosen the bolts and repeat the torque process. This helps seat the rod bearing, especially on a new rod. Measure the bore with your dial bore gauge opposite the parting lines. If using a plastic gauge, you must install the rod on the crank and use it as instructed.
The rod should measure 1.191 +/.0005". With a plastic gauge, you are looking for a clearance of about .003". A clearance between .0025 and .0035" is acceptable. For anything outside that dimension, please call 800-521-3560 for a recommendation.
Once clearance is set, apply oil to the rod, crank, and wrist pin and install this time torque to 170" lbs.
Improperly torquing rod bolts is one of the most common causes of rod failure.
Refer to the instructions shipped with all rods and the video below for more detailed instructions.
