Exchanging the Plain Bearing | MAHLE MPULSE Tool Time Part 3

When exchanging the plain bearing, it is very important to first look at the crankshaft. The crankshaft must not be groovy and check the crankshaft dimensions with an outside micrometer. If the crankshaft is free of grooves and the dimensions are correct, order the matching big end bearing or the matching main bearing. When the bearing shells arrive, unpack them with a lint-free cloth and clean the bearing back. Look at the connecting rod and clean it. It must not have any grooves either. To be exact, screw the bearing cap onto the connecting rod without bearing, tighten it with the right torque and measure the borehole with a dial gauge. If the borehole is okay, take the new bearing, cleaned from the outside, and insert it into the bearing cap. Do the same with the connecting rod. High-performance engines have a special feature, sputter bearings. With these sputter bearings make sure that the bearing, which is marked „sputter“, fits into the connecting rod and the other one into the bearing cap. Sputter bearings are made from two different materials And, because the bearing in the connecting rod is subjected to heavier loads, the spade bowl must be put in as well. If the motor also has sputtered main bearings, it is just the other way around.There, the sputter bearings are built in the main bearing cap and other bearings into the engine block. Now that the bearings have been put into the connecting rod, they must be oiled well, after which the piston with connecting rod is inserted into the engine block; the bearing cap must be fixed onto the connecting rod from below. When doing this, pay attention to the cap position which is marked beforehand in order to avoid mounting the cap the wrong way. If this was the case, the engine would get stuck.

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