Nissan 12111-4W000 Bearing-Connecting Rod

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The old bearings must be kept during engine inspection although these will be replaced with new ones as part of the overhaul because they can give vital information on the condition of the engine and potential problems. For example, bearing failure may be due to factors such as inadequate lubrication, dust or foreign matter, overloading of the engine and corrosion. Bearings are removed from their positions of assembly like those in the engine block, main bearing caps, connecting rods and rod caps then arranged systematically so as to relate any bearing faults with their respective journal in the crankshaft. Foreign particles such as dust and metal chips can also enter into an engine through various ways including assembly, filtration or even PCV mechanisms causing more harm on bearings and scratching. This can be solved by adopting proper cleaning techniques that include thorough part cleaning and keeping clean during assembly, regular oil changes together with frequent filter replacements. Bearing failure can also occur when lubrication breaks down which is caused by things like excessive heat, overloading, oil leaks, blocked oil passages resulting in wiped or extruded bearing material on a worn out camshaft lobe. For instance driving habits like high load application at low speed operation of high gears or short trip driving exposing bearings to flexing corrosion leading to shorter life span. When building an engine it is essential to use correct bearing installation techniques hence tight fitting or incorrectly placed bearings being some symptoms of starvation for oil and hence bearing failure most often results from incorrect installation of bearings onto a crankshaft during assembly process. New bearings have to be procured if original bearings become worn out damaged or have incorrect oil clearances. In most cases new replacement bearings are used during a complete car engine rebuild especially where there was some considerable milage covered by this motor. If the crankshaft has been re-ground then undersize bearings must be used corresponding to the amount of material removed from it . Generally ground in 0.010 inch increments that vary depending on the specifications of the automotive machine shop reconditioning the crankshaft. Plastigage measurements are helpful for determining bearing sizes regardless of how this is done and when there are doubts about size selection, it is necessary to contact the machine shop or dealer parts/service department.

As the engine's overhaul proceed, although new main and connecting rod bearings are often fitted, it is informative to retain several of the old bearings for analysis. Failure to bear causes can occur from lack of oil or lack of clean oil, dirt or foreign particle, overloading of the engine, and corrosion among others must be checked before assembling again so that they might not be repeated. Regarding bearings, they have to be taken out from their s Mining th My location and spread neatly so as to match any defects with the crankshaft journal. It concerns foreign particles that can get inside the engine during its assembly, in the course of filter usage, or due to some machineries; these foreign particles may lodge themselves in the bearing material resulting to scoring or gouging. To avoid such failures, all parts must be cleaned and the oil as well as the filter changed frequently. The causes of lubrication breakdown are high temperatures, overloading, oil leakage, or blocked oil ways leading to adhesion of bearing material and hence high temperatures. Driving habits also affect bearings; for example, low speed combined with high gear results in high load, short trips expose them to moisture and gases resulting in corrosion. Some of the issues include tight bearing pocket or improper housing layout, trapped material between the bearings or housing halves and other such conditions. If original bearings are worn or if oil clearances are incorrect, new bearings must be obtained, especially if the crankshaft has been reground, as undersize bearings depending of the amount of material taken off would have to be used. The bearings for the automotive machine shop are available in standard sizes which has standard grinder in steps of 0.010 inch, and bluing done on the reground crankshafts show the amount done. Finally, oil clearance should be confirmed with the help of the Plastigage if there are doubts and it is always wiser to consult a machine shop or the parts department in the event of a doubt concerning the choice of bearings.

12111-4W000 shows a total quantity of 12 applicable to this VIN, meaning that 12 would need to be ordered to have a complete set. The main bearings come as a set of two per quantity.

THERE IS A CHART IN THE PARTS FIELD, THERE ARE NUMBERS ON THE FRONT OF THE CRANKSHAFT, COPY THEM DOWN AND THEY WILL TELL YOUR WHAT GRADE TO USE ON THE CHART IN THE PARTS PICTURE