3025994 - 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 flywheel lock.

	Name	Country
1	Counter-torque	1.860.161.001

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

	Name	Country
-	Counter-torque	1.860.161.001

3. Undo the bolts (3a) and remove the oil cover, flywheel side (3b).4. Fit the tool.

	Name	Country
4	Flange	1.820.618.000

Rotate the crankshaft using the tool fitted previously until cylinders no. 1 and no. 4 are at B.D.C.

To facilitate crankshaft rotation, remove one spark plug for each cylinder.

5. Undo the bolts (5a) and remove the big end bearing caps (5b) with the bearing shells (5c) of cylinders no. 1 and no. 4.Do the same to remove the big end bearing caps of cylinders no. 2 and no. 3. 1. Remove the tool.

	Name	Country
1	Flange	1.820.618.000

2. Undo the bolts (2a) and remove the main bearing caps (2b) complete with bearing shells (2c).3. Remove the crankshaft.4. Remove the half-bearings.5. Remove the thrust washers.6. Remove the big end bearing shells. Refitting ( Removing ) Visually inspect the condition of the main and big end bearing shells and, if necessary, replace them.Record the thickness of the main bearing halves.

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

Record the thickness of the main bearing halves.

	Measurement		Value
-	Crankpin 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.

	Measurement		Value
-	Main journal clearance (mm)	crankshaft main journals	0.031 ÷ 0.051

	Measurement		Value
-	Big end bearing clearance (mm)	crankshaft big end bearings	0.036 ÷ 0.056

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 .The clearance between bearing halves and pins must be within specified values.1. Refit the big end bearing shells in their seats.2. Refit the main bearing halves.3. Place the crankshaft back in its housing.4. Refit the 3 main bearings and the thrust half-washers.5. Refit the main bearing caps (5a) complete with haf-bearings (5b).

The bearing caps are numbered progressively (from zero to four starting from the front of the engine) which defines their fitting position.

6. Tighten the bearing cap bolts to the recommended torque.

	Fastening	Component	Ø	Value(daNm)
6	Bolt	MAIN BEARING CAPS	M12	2.4 ÷ 2.6 + 100

Use the goniometer to angle tighten the main bearing cap bolts.

	Name	Country
-	Protractor	1.860.942.000

Check that the crankshaft end float is within the recommended values using a magnetic base fitted with a dial gauge.

	Measurement		Value
-	Crankshaft end float (mm)		0.059 ÷ 0.221

If the end float of the crankshaft is not within the recommended values, when refitting, reface the seat in the cylinder block and use suitable oversize thrust washers. 1. Refit the flywheel side oil seal (1a) in its seating and tighten the bolts (1b) to the specified torque.

	Fastening	Component	Ø	Value(daNm)
1b	Bolt	CRANKSHAFT REAR COVER	M6	(Engine crankcase side) 0.8 ÷ 1.0

Fit the tool.

	Name	Country
-	Flange	1.820.618.000

Rotate the crankshaft until cylinders no. 1 and no. 4 are at B.D.C.2. Fit the big end bearing caps (2a) complete with bearing shells (2b) and tighten the bolts (2c) to the recommended torque.

The connecting rod caps are fitted so that the number stamped on them is facing the same side as the one stamped on the big end.

	Fastening	Component	Ø	Value(daNm)
2c	Bolt	BIG END BEARING CAPS	M9	2.4 ÷ 2.6 + 60

Use the goniometer for angle tightening the big end bearing cap bolts.

	Name	Country
-	Protractor	1.860.942.000

3. Fit the flywheel lock.

	Name	Country
3	Counter-torque	1.860.161.001

4. Refit the engine flywheel (4a) in its housing and secure by tightening new bolts pretreated with sealant (4b) to the recommended torque.

	Fastening	Component	Ø	Value(daNm)
4b	Bolt	FLYWHEEL	M12	(Crankshaft side) 14.4 ÷ 17.6

Remove the flywheel lock.

	Name	Country
-	Counter-torque	1.860.161.001

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