Checking the lubrication clearance of the main bearings
1. Install new main bearing shells.
2. An internal micrometer or other special device can be used to measure the lubrication gap, but the most accurate and easiest method is to use a special plastic gauge.
3. Clean the crankshaft, bearings and oil holes, then carefully install the crankshaft onto the bearings.
4. Lay a piece of plastic on each of the main bearings along the axis of the shaft.
5. Install the main bearing caps being careful not to move the plastic. Tighten the fixing bolts of the covers to the required tightening torque in the sequence shown. Do not turn the crankshaft.
6. Loosen the screws and carefully remove the covers.
7. Compare the crushed film width with a special scale to determine the lubrication gap.
8. If the clearance is not within specifications, install a different size of bearings. Bearings can be turned if necessary.
9. Carefully remove traces of film from the shaft and bearings.
Final installation of the crankshaft
1. Carefully remove the crankshaft.
2. Install the center main bearing half rings.
3. Clean the surface of the bearings and lubricate them with grease or engine oil.
4. Check that the crankshaft bearings are clean and reinstall the crankshaft.
5. Lubricate and install the lower bushings. Establish covers of radical bearings and insert fixing bolts.
6. Lubricate and install the lower bushings. Establish covers of radical bearings and insert fixing bolts.
7. Tighten all main bearing cap bolts to the correct torque in the sequence shown.
8. Turn the crankshaft by hand several times and check for ease of movement.
9. Check crankshaft end play and install rear oil seal.