Installing the crankshaft main bearing shells
Note. If the old crankshaft bearings were used in a runaway engine, they must be replaced with new ones during reassembly.
1. Clean the slots in the crankcase with a lint-free cloth.
2. Remove all oil from the back of the bearing shells.
3. Install the upper main bearing shells in the cylinder block. Pay attention to the fact that on the third root support (2) thrust bearing installed (1).
Note. Make sure that the upper bearing shells have oil grooves and holes. Rotate the earbuds until the latch tab is seated in the slot. The liner must be installed flush with the surface of the cylinder block.
4. Install the lower main bearing shells into the caps.
Note. The lower main bearing shells can be recognized by the absence of oil grooves and holes. The bushing must be flush with the surface of the bearing cap.
1. Install the crankshaft key. Tap the key lightly with a bronze/plastic mallet to seat it securely in place.
2. Apply a moderate amount of clean engine oil to the crankshaft main bearing shells.
3. Carefully lower the crankshaft into place in the cylinder block.
4. Determine the correct installation order for the crankshaft main bearing caps. Lids are numbered (1) 1 to 4, starting with the front main bearing. Arrow (2) serves to orient the bearing cover, it must be directed towards the front of the engine.
5. Install the crankshaft main bearing caps.
6. Fit new inner main bearing cap bolts (4).
7. Fit new outer main bearing cap bolts (3).
8. Fit new short/inner main bearing cap side bolts (2).
Note. The side bolts of the main bearing caps have a special coating on the bolt head flange, so always use only new bolts, otherwise oil leaks from the crankcase may occur.
9. Fit new long/outer main bearing cap side bolts (1).
10. Approach the crankshaft main bearing caps with a plastic hammer.
11. Tighten the inner bolts of the main bearing caps in the sequence shown in two steps:
- Tighten bolts to 20 Nm.
- Using tool EN 45059 tighten the bolts by 80.
12. Tighten the outer bolts of the main bearing caps in the sequence shown in two steps:
- Tighten bolts to 15 Nm.
- Tighten the bolts by 110°using tool EN 45059.
13. Tighten the short side bolts of the main bearing caps (17-20) in the specified sequence in two stages:
- Tighten bolts to 30 Nm.
- Using tool EN 45059 tighten the bolts by 60°.
14. Tighten the long side bolts of the main bearing caps (21-24) in the specified sequence in two stages:
- Tighten bolts to 30 Nm.
- Using tool EN 45059 tighten the bolts by 60°.
15. Make sure that the crankshaft rotates silently and evenly.
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