(1) Removal of the main bearing cap, lower bearing shell, and thrust bearing
① Rotate the engine on the test bench so that the oil pan mounting flange faces upward. The markings on the main bearing cap must match the numbers on the cylinder block oil pan flange, see Figure 2-134. During installation, the numbers on the main bearing cap and oil pan flange should match, and the locating tongue of the main bearing cap must be aligned with the locating tongue.
② Use the ST-1178 main bearing cap puller to remove the main bearing cap, see Figure 2-135. The No. 4 main bearing cap is connected to the cylinder block by a locating pin, and the No. 4 main bearing shell is fitted with a thrust bearing. During disassembly, it is strictly forbidden to shake the main bearing cap; only the puller can be used to pull the main bearing cap vertically upward.
③ Remove the lower bearing shell from the main bearing cover and mark the journal number at the time of disassembly on the surface of the locating tongue, as shown in Figure 2-136.
④ Remove the lower thrust bearing from the No. 4 main bearing cover and mark it with the letters "L" and "front" or "rear", as shown in Figure 2-137.
Remove the upper thrust bearing from spindle journal No. 4 and mark it with the letters "U" and either "front" or "rear", as shown in the figure. 2-138。
(2) Crankshaft and Upper Bearing Removal
① Place nylon slings on connecting rod journals No. 3 and No. 4, and use a crane to remove the crankshaft, as shown in Figure 2-139.
② Remove the upper bearing and mark the journal number at the time of removal on the surface of the bearing locating tongue, as shown in Figure 2-140.
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