Contents: Installing an indicator to check the…⤓ Installing an indicator to check the…⤓ Main bearings ⤓ Tightening Procedure for Main…⤓ Tightening order of main bearing…⤓ Removal ⤓ Cleaning and checking ⤓ Installation ⤓
Installing an indicator to check the crankshaft axial play
Installing an indicator to check the runout of the crankshaft main journals
Main bearings
1, 3. Groove missing; 2. With a groove; 4. Middle liners N 3; 5. Lower liners N 1, 2, 4 and 5; 6. Upper liners N 1, 2, 4 and 5
Tightening Procedure for Main Bearing Caps on 4-Cylinder Engines
Tightening order of main bearing caps on 6-cylinder engines
1. Crankshaft; 2. Front arrow; 3. Lid; 4. Bolt
Removal
1. Remove the engine and transmission.
2. Remove the cylinder head, timing belts, oil pan, oil pump, flywheel, and rear oil seal.
3. Turn the engine over and check the crankshaft axial play.
4. Loosen the main bearing cap bolts and remove the caps, having previously marked their orientation and belonging to a given cylinder (some of the covers have an arrow pointing towards the front of the engine).
5. Remove the crankshaft and main bearings, which you store separately.
6. Wash the crankshaft with solvent and dry.
Cleaning and checking
1. Check the uniformity of wear on the main and connecting rod journals, the presence of scoring, cracks or local erosion.
The article was taken from the website: mitsubishiman.ru
2. Check the uniformity of wear on the journals. If the wear is uneven, the crankshaft journals should be reground at a car service center and all bearings should be replaced with repair bearings.
3. Measure the diameter of the main and connecting rod journals with a micrometer and compare the result with the standard value. Check the out-of-roundness (1) and taper (2) of the main and connecting rod journals by measuring their diameter at several points around the circumference and along the journal.
4. Check the surface of the main bearings. If there are any signs of questionable condition, or if the axial clearance is higher than normal, replace the bearings. When disassembling the engine, it is recommended to replace the liners.
Installation
1. Check the clearances in the main bearings using the thickness of a crushed plastic gauge. To do this, place the inserts (see picture Main bearings), install the crankshaft and tighten the cover bolts with liners, then carefully remove the covers. The presence of oil on the journals and turning of the crankshaft during measurements are not permitted.
2. If the gaps are not within the norm, replace the liners. If replacement does not result in normal clearance, then grind the crankshaft.
3. Check the crankshaft runout.
4. During final assembly, lubricate the crankshaft journals and check the alignment of the bearings. Install the covers (1 – orientation arrows, 2 – cover number), orienting them correctly according to the existing marks or those applied during disassembly, and tighten the bolts. General tightening order: middle cover – 2nd – 4th – front – rear.
5. Without tightening, install the seals, oil receiver and pan.