1. Install the unit upside down.
2. Remove bolts of covers of radical bearings and remove covers. Arrange them in the correct order to ensure proper assembly.
3. Remove the bearing shells from the block and from the main bearing caps, if they are still there. Wipe the block bearing surfaces and covers with a clean, lint-free cloth. They must be immaculately clean.
Checking the lubrication gaps of the main bearings
1. Clean the backs of the new bearing shells and install them in each block bearing seat. If one of the bushings of each pair has a wide groove, make sure the grooved bushing is installed in the block. Install the rest of the shells from each pair into their respective main bearing caps. Make sure the tab on the liner is aligned with the recess in the block or cover.
The lubrication holes in the block must match the lubrication holes in the bushings. Do not hammer the liner into place and keep surfaces free of nicks and scratches. Nothing should be lubricated at this stage.
2. Thrust bearing with flange must be installed in #3 cover and seat on M10 engine, #6 cover and seat on M20 engine, #4 cover and seat on M30 engine, and in #4 seat only on M40 engine.
3. Wipe with a clean, lint-free cloth the surfaces of the bearings in the block and the crankshaft main bearing journals.
4. Check or clean the crankshaft lubrication holes, as the dirt from them will definitely get right into the new bearings.
5. When you are sure that the crankshaft is clean, carefully place it on the main bearings.
6. Before finally installing the crankshaft, check the main bearing lubrication clearances.
7. Cut a few pieces of plastic gauge wire to the appropriate length (slightly shorter than the width of the main bearings) and place one piece on the crankshaft journal of each main bearing, parallel to the axis of the crankshaft.
8. Clean the surfaces of the bearings in the covers and install the covers in their respective places (don't mix them up), with the arrows pointing towards the front of the engine. Do not move pieces of plastic wire.
9. Starting with the central main bearing and moving to the extreme ones, gradually tighten the bolts of the main bearing caps to the force given in Table of sizes and adjustment data at the end of the Guide. On M10, M20 and M30 engines, tighten the bolts in three steps. On M40 engines, first tighten the bolts to the torque of step 1, then tighten the bolts to the angle given in Table of sizes and adjustment data at the end of the Guide. Turn the bolt to a certain angle in one motion. Do not turn the crankshaft while tightening the bolts.
10. Turn away bolts and carefully remove covers of radical bearings. Save the main bearing caps. Keep them in order. Do not touch the plastic wire or rotate the crankshaft. If any of the main bearing caps are difficult to remove, tap them on both sides with a flexible-headed hammer.
11. Compare the flattened wire width of each journal with the scale printed on the plastic wire package to get the grease clearance in the main bearings. Check by Table of sizes and adjustment data at the end of the Guide their correctness.
12. If the clearance does not meet the requirements, then the bearing shells can be of the appropriate size (it means that others are needed). Before deciding on the need to purchase other shells, make sure that there is no dirt or oil between the bearing shells and the caps or block when measuring the clearance. If the width of the wire turned out to be unequal along its length, then the neck may have a taper (see Section Checking the condition of the crankshaft).
13. Carefully remove all traces of wire material from the bearing journals and/or bearing surfaces. Do this with your fingernail or the edge of a plastic credit card so that there are no nicks or scratches on the surface of the bearings.
Final installation of the crankshaft
1. Carefully remove the crankshaft from the engine.
2. Clean the block bearing surfaces, then apply a thin, even coat of molybdenum disulphide grease or engine oil to both surfaces. Remember to lubricate the thrust surfaces as well as the surface of the thrust bearing journal.
3. Make sure that the crankshaft journals are clean, then reinstall the crankshaft into place in the block.
4. Wipe the surfaces of the bearings in the caps, then lubricate them with engine oil.
5. Install the covers in their places, and the arrows should be facing the front of the engine.
6. Hand tighten the bolts.
7. Tap the ends of the crankshaft lightly with a lead or bronze hammer to align the main bearing surfaces and the crankshaft thrust surfaces.
8. Torque tighten the bearing cap bolts, working from the center outwards. On M10, M20 and M30 engines, tighten the bolts to final torque in three steps, skipping the thrust bearing cap bolts. On M40 engines, tighten all bolts in the two steps indicated in Table of sizes and adjustment data at the end of the Guide.
9. On M10, M20 and M30 engines, tighten to the torque shown in Table of sizes and adjustment data at the end of the manual, thrust bearing cap bolts.
10. On manual transmission models, install a new auxiliary bearing on the end of the crankshaft (see chapter Clutch).
11. Turn the crankshaft several times by hand to check for obvious jamming.
12. The last step is to check with a feeler gauge or a dial indicator for crankshaft axial play, as described in Section Removing the crankshaft. If the thrust surfaces of the crankshaft are not worn or damaged and new bearings are installed, then the axial play should be normal.
13. Install a new oil seal, then tighten the bolts securing the oil seal housing to the block (see Section Installation of a back epiploon of a cranked shaft).