TLDR: To do it right and not have to do it again in a month (or possibly right after start up), the only way to fix this is to either pull the crankshaft and have it turned, as well as check the connecting rod, or replace the engine (might make more economic sense to …

Jun 1, 2004 · The crankshaft does not turn directly on the bearings but on the thin film of oil trapped between the surfaces. Should the crank journals get out of round, tapered or scored, the oil film will not form properly.

Mar 10, 2009 · I have a 6 bolt crankshaft that has some scoring on the main journals. I wanted to know if I could still use this crank, maybe get it polished or if I should search for another? Here are some pics, the third main journal looks and feels the worse:

Just a very light scrubbing with a scotch bright pad would soften up the burrs. If you can’t feel it with your fingernail after rubbing on it a bit then you’re fine to throw new bearings on it and call it a day. At that mileage go ahead and give it a shot, the cheaper the fix the better.

Nov 1, 2021 · Once the engine is operating the bearings are operating in a Hydrodynamic lubrication mode in which the pressurized oil film keeps the bearing and crank surfaces from contacting each other. In this mode the ridges on the crank can't score the bearing.

Under certain conditions, scored crankshaft journals or damaged journal bearings may be kept in service if proper repair is performed. Repair of SCORED JOURNALS depends on the extent of scoring. If a crankshaft has been overheated, the effect of the original heat treatment will have been destroyed.

Jun 2, 2017 · Scoring might just look like a valley, but the edges are actually raised. These raised edges can wipe the oil from the bearing, collect contaminants, wear or grab the new bearing and cause it to spin again. Perhaps even some form of cavitation is possible as well, leading to hot spots and its associated problems.

Jun 25, 2019 · You'll likely have damage on the crankshaft itself, and if you just slop new bearings in, the scored crank will take them out in no time. If you want to fix it right, the engine comes out, comes apart, and gets rebuilt properly with all clearances checked and …

Jun 2, 2012 · Hi guys, my EP3 k20a2 has chewed a rod bearing on number 3. There is some marking on the crank but it doesn't feel rough. Do you know if it's possible to get this reground and then re-case-hardened? Are there any better/cheaper options I should be looking at? A new crank from Honda is mega $$$

Aug 30, 2024 · Crankshaft journal damage occurs when the precision surfaces of the crankshaft become worn, scored, or deformed, often due to lack of lubrication, contaminated oil, or excessive engine load. This damage can lead to engine knocking, low oil pressure, and increased vibrations, potentially resulting in severe engine failure if not addressed promptly.