1016E10 SINGLE CYLINDER HEAD, REMOVED - OVERHAUL - Fiat - STILO - eLearn

3363555 - 1016E10 SINGLE CYLINDER HEAD, REMOVED - OVERHAUL

) 1. Position the cylinder head (1a) in the vice supporting it using a suitable tool (1b).2. Remove the spark plugs using a suitable spanner.

	Description	Code
1b	Support	1.860.470.000

1. Remove the thermostat and the gasket underneath adjusting the fixing bolts.

1. Undo the nut and remove the timing drive belt automatic tensioner.

1. With the tools (1a), (1b), (1c), (1d) and (1e) assembled as illustrated in the diagram, compress the valve springs.2. Release the cotters (2a), caps (2b) and springs (2c), then, removing the tool, release the inlet and exhaust valves (2d) from the cylinder head.

	Description	Code
1a	Lever	1.860.790.000

	Description	Code
1b	Lever hook	1.860.788.000

	Description	Code
1c	Extension	1.860.787.000

	Description	Code
1d	Valve retaining base	1.860.786.000

	Description	Code
1e	Chamber	1.860.877.000

1. User pliers (1a) to remove oils seals (1b) from the valve guides.2. Fit the lower valve spring shims.

	Description	Code
1a	Extractor	1.860.989.000

Refitting ( Removing

) De-carbonize and clean the valve seats and ducts.Clean any residues of the old gasket from the lower cylinder head plane.Check that the cylinder head plane flatness is within the recommended values.

	Measurement		Value
-	Lower plane planarity (mm)		0.1

If necessary flatten the lower cylinder head surface; it is permitted to remove 0.1 mm of material from the minimum cylinder head height (factory value).

	Measurement		Value
-	Cylinder head height (factory value) (mm)		77 ± 0.2

1. Check that the refacing has not changed any of the combustion chambers in the areas (1a) or else the head must be replaced.

Also check all the combustion chambers proceeding as follows:1. Fit the valves and spark plugs provisionally. Take a graduated burette containing a known amount of engine oil.2. Rest a glass plate on the cylinder head with holes corresponding to the combustion chambers.3. Fill the combustion chamber completely, taking care not to pour oil outside the combustion chamber.Wait about 10 minutes to allow the oil to decant.Measure the amount of oil remaining in the burette and then calculate the difference between this and the amount of oil used initially with the burette full. The difference is the volume of the chamber.Check that this value is within specified values, otherwise replace the cylinder head.

	Measurement		Value
-	Combustion chamber volume (cm)		12.28

Check that the valve stem does not show signs of scoring or binding.Check that the diameter of the valve stems corresponds to the recommended figures; if not, replace the worn valves.

	Measurement		Value
-	Intake and exhaust valve stem diameter (mm)		5.90 ÷ 5.94

Check that the thickness of the cylindrical section of the valve head is within specified values.

	Measurement		Value
-	Thickness of cylindrical section of valve head (mm)		1

Check that the diameter of the valve head corresponds to the recommended figures; if not, replace the valves.

	Measurement		Value
-	Inlet and exhaust valve outer diameter (mm)		22.55 ÷ 27.05

1. Check that the inner diameter of the valve guide and the clearance between it and the valve are within specified values, otherwise replace the valve guide.If necessary, replace the valve guide with reference to op. Op. 1016E14 VALVE GUIDES IN SINGLE CYLINDER HEAD - REPLACE DURING OP. 1016E10.

	Measurement		Value
-	Valve guide inner diameter (mm)		6.022 - 6.040

	Measurement		Value
-	Valve stem - valve guide clearance (mm)		0.14 ÷ 0.082

Grind the valve seats if the valves and valve guides are replaced.

	Measurement		Value
-	Upper ring taper "a" (-)		45° ± 20''

	Measurement		Value
-	Taper "b" of ring in contact with valve (-)		30°

	Measurement		Value
-	Taper "c" of lower ring (-)		15°

	Measurement		Value
-	Contact band width "I" with valve (mm)		~ 2

When the operation is complete, clean the valve seats thoroughly.

Using an appropriate tool, check that the valve spring specifications correspond to the recommended figures; if not, replace the worn components.

	Measurement		Value
-	Height of spring (mm)		33.6
	Under a load of (daNm)	16.7

	Measurement		Value
-	Height of spring (mm)		25.2
	Under a load of (daN)	36.6

1. Fit the lower valve shims (1a); place the oil seals (1b) on the valve guides, positioning the drift (1c) on the valve stem fitted provisioinally in its seat, then fit a new oil seal on the drift.2. Fit the oil seal in its housing using the drift shown in the diagram.

	Description	Code
1c	Drift	1.860.993.000

	Description	Code
2	Drift	1.860.993.000

Refit the valves, springs, cotters and caps using the same equipment as for the dismantling.

	Description	Code
-	Lever	1.860.790.000

	Description	Code
-	Lever hook	1.860.788.000

	Description	Code
-	Extension	1.860.787.000

	Description	Code
-	Valve retaining base	1.860.786.000

	Description	Code
-	Chamber	1.860.877.000

Fit the timing drive belt tensioner.Fit the thermostat and seal.Remove the cylinder head from the vice.Remove the cylinder head support tool.

	Description	Code
-	Support	1.860.470.000