3239074 - 1024A10 crank shaft - r + r with engine removed - check main and connecting rod bearingand replace if necessary

Removing ( Refitting ) Proceed with the removal  - 1020D17  engind front cover - r r . 1. Fit the tool.

	Name	Country
1	Counter-torque	1.820.624.000

2. Undo the bolts (2a) and remove the flywheel (2b).Remove the tool.

	Name	Country
-	Counter-torque	1.820.624.000

3. Undo the bolts (3a) and remove the crankcase rear cover (3b) integrated with the oil seal.4. Fit the tool.

	Name	Country
4	Flange	1.820.618.000

Rotate the crankshaft using the tool fitted previously until the cylinder concerned is at B.D.C.1. Undo the bolts (1a) and remove the connecting rod cap (1b).2. Remove the bottom big end bearing shell.Proceed in the same way with removing the connecting rod caps and the half-bearings for the remaining cylinders.3. Undo the bolts (3a) and remove the bearing caps (3b).4. Remove the lower main journal half-bearings.5. Remove the crankshaft.6. Remove the upper connecting rod half-bearings.7. Remove the upper main bearing shells.8. Remove the thrust washers from the 4th main journal support. Refitting ( Removing ) Visually inspect the condition of the main journal and connecting rod half-bearings and, if necessary, replace them.Record the thickness of the main bearing halves.

	Measurement		Value
-	Half-bearing thickness (mm)	Category B	1.839 ÷ 1.843
Category C	1.842 ÷ 1.846
Classe A	1.836 ÷ 1.840

Record the thickness of the main bearing halves.

	Measurement		Value
-	Connecting rod half bearing thickness (mm)	Category B	1.530 ÷ 1.534
Category C	1.533 ÷ 1.537
Classe A	1.527 ÷ 1.531

Measure the clearance between main journals and bearing halves and crankpins and bearing halves using Plastic Gauge.The clearance between bearing halves and pins must be within specified values.

	Measurement		Value
-	Clearance between crankshaft bearings - main journals (mm)		0.025 ÷ 0.052

	Measurement		Value
-	Big end bearing - crankpin play (mm)		0.025 ÷ 0.052

If the clearance is not within specified values, replace the main and/or connecting rod bearing halves as indicated in  - 1004E20  engine - dismantle and re-build following operation 1004e10 - wash and check dismantled parts - re-fit cylinder head and oil sump - does not include repairs to cylinder head and auxiliary unit . Fit the upper main journal half-bearings in the cylinder block/crankcase.Fit the upper connecting rod half-bearings on the connecting rods.Fit the crankshaft on the cylinder block/crankcase.Fit the thrust washers on the 4th main journal support.1. Fit the bearing caps.

The bearing caps have progressive references (from zero to five starting from the front of the engine) which define their fitting position.

1. Tighten the bearing cap bolts (1a) to the recommended torque using the angular tightening tool (1b).

	Fastening	Component	Ø	Value(daNm)
1a	Bolt	MAIN BEARING CAPS	M12	(Engine crankcase side) 2.4 ÷ 2.6 +100?

	Name	Country
1b	Protractor	1.860.942.000

Rotate the crankshaft using the tool fitted previously until the cylinder concerned is at B.D.C.Fit the connecting rod cap, complete with half-bearing, and fix it using the bolts without tightening them.

The connecting rod caps are fitted with the number stamped on them facing the same way as the number stamped on the connecting rod (inlet side).

Continue in the same way when fitting the connecting rod caps for the remaining cylinders.1. Tighten the bolts (1a) for the connecting rod caps to the recommended torque, using the angular tightening tool (1b).

	Fastening	Component	Ø	Value(daNm)
1a	Bolt	BIG END BEARING CAPS	M9	2.4 ÷ 2.6 + 60?

	Name	Country
1b	Protractor	1.860.942.000

Remove the tool.

	Name	Country
-	Flange	1.820.618.000

1. Fit the crankcase rear cover (1a) with the oil seal integrated using the tool (1b).

	Name	Country
1b	Fitting tool	1.820.619.000

2. Tighten the bolts securing the crankcase rear cover to the recommended torque.

	Fastening	Component	Ø	Value(daNm)
2	Bolt	FLYWHEEL SIDE COVER	M6	(Engine crankcase side) 0.8 ÷ 1.0

Remove the tool.

	Name	Country
-	Fitting tool	1.820.619.000

Fit the tool.

	Name	Country
-	Counter-torque	1.820.624.000

Fit the flywheel and tighten the bolts to the recommended torque.

	Fastening	Component	Ø	Value(daNm)
-	Bolt	FLYWHEEL	M12	(Crankshaft side) 13.6 ÷ 16.8

Remove the tool.

	Name	Country
-	Counter-torque	1.820.624.000

Proceed with the refitting  - 1020D17  engind front cover - r r .