It's common practice to machine crank journals 0.010-inch under the factory diameter (sometimes 0.020-inch); this simply means you'll have to use the corresponding oversize bearings. After changing the oil it still knocks and seems to be coming from the 3 cylinder. BUT the machine shop will want to have a clean block to work with ($100 including installing new cam bearings and frost plugs) + about another $100 to hang the new piston onto the old rods. A spun rod bearing will tear up the big end bore in the rod, ruin the rod journal on the crankshaft, and sometimes break the connecting rod. Heres my old saturn lifter vs rod bearing noise Lifter: (only listen to the idle sound and try to ignore the connecting rod bearing noise in the background, this islifter and rod bearing) real lifter noise - YouTube Rod bearing: This is generally healthy lifters, with a spun rod bearing. The specification is 1.967-1.968" and production repair would be 1.957-1.958" which would require a .010 undersized bearing. Usually when a bearing spins it also causes extreme heat in that rod or main cap. Strength is critical in a connecting rod. Could I replace 1 rod bearing … What happens next depends on the bearing’s location. Spun rod bearings are the most common failure. After driving my car hard, the next day I start it up and the engine begins to knock. Hone to .002-inch oversize for oversized (outside diameter) rod bearings. Check rod journal sizing before any machine work begins. I do plan to replace my rod bearings so I figured since I am taking them out I might as well replace them. Rod bearings ensure that the rods operate smoothly around the crankshaft on one end, and the piston wrist pins on the other end. Connecting rod bearings are extremely important components of any engine, whether it's a Toyota or a Ferrari engine. Without knowing it i was running my engine on 1.5 quarts of oil. This writeup applies to replacing the main and rod bearings in any transverse-engined SAAB 4-cylinder, 9000, NG900, 9-3, and 9-5, and pretty much any other car as long as you can remove all the main bearing caps without … If a rod is going to fail, it will most often pull apart on a piston upstroke rather than bend during a piston downstroke. A rod can also fail if the bearing starves for oil, seizes and rips the rod … Generally speaking if it's knocking (rod or main bearing) even a very short amount of time and there is probably some damage to the bearing journal surface minimum. A GOOD machine shop will want to recondition the old rods by magnifluxing, shot peening, resizeing, and new high strength rod … The real question is, why did that bearing fail? The forces that stretch and compress the rods exert tremendous stress on the beam section of the rod. Step 26: Hone Rod Journal. Rod journal bore size should be 2.234 to 2.240 inches (56.756 to 56.876 mm). Overhauls were more common 50 years ago ... today most shops are unwilling to fix up a tired engine to get another 40,000 or 50,000 miles out of it. Bearing … A spun bearing is bad news because it usually seizes itself around the crankshaft journal. I dont really want to get the arp's if I have to do any machining on the … Machine work is generally required not only on the crank shaft, but the main cap and/or rod. Without any machining, I'd call it an "overhaul" rather than a "rebuild". Replacing the bearings … Rod … Trying to use plastigage without resizing the rod and polishing the crankshaft on a machine … Hone the large end carefully until proper inside diameter is achieved. Usually an overhaul would include new rings, new rod bearings… Strength is critical in a connecting rod bearings ensure that the rods exert tremendous stress on the ’! 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