2429749 - 1016E10 single cylinder head, removed - overhaul
Dismantling
(
Reassembling
)
1. Position the cylinder head in the vice, supporting it with a
suitable tool (1a).2. Use a suitable wrench to remove the spark plugs
| Name | Country |
|---|
| 1a | Support | 1.860.470.000 |
1. Remove the thermostat and the gasket underneath using the fixing
bolts.
1. Undo the nut and remove the automatic timing drive belt tensioner.
1. Using the tools (1a), (1b), (1c), (1d) and (1e) as illustrated
in the diagram, compress the valve springs.2. Remove the cotters (2a), caps (2b) and springs (2c), then remove
the tool to remove the inlet and exhaust valves (2d) from the head.
| Name | Country |
|---|
| 1a | Lever | 1.860.790.000 |
| Name | Country |
|---|
| 1b | Lever hook | 1.860.788.000 |
| Name | Country |
|---|
| 1c | Extension | 1.860.787.000 |
| Name | Country |
|---|
| 1d | Valve retaining base | 1.860.786.000 |
| Name | Country |
|---|
| 1e | Chamber | 1.860.877.000 |
1. Using pliers (1a), remove the oil seals (1b) from the valve guides.2. Remove the lower valve shims.
| Name | Country |
|---|
| 1a | Extractor | 1.860.989.000 |
Reassembling
(
Dismantling
)
De-carbonize and clean the valve seats
and ducts.Clean the residues of the old gasket from
the lower surface of the cylinder head.Check that the planarity of the lower cylinder
head surface is within the recommended values.
| Measurement | | Value |
|---|
| - | Flatness of bottom surface (mm) | | 0.2 |
If necessary, reface the lower cylinder
head surface; it is permissible to remove 0.1 mm of material over
and above the minimum cylinder head height (factory dimension).
| Measurement | | Value |
|---|
| - | Cylinder head height (construction figure)
(mm) | | 77 ± 0.2 |
1. Check that the levelling operation has not changed any combustion
chamber in areas (1a). Otherwise replace the head.
Also check all the combustion
chambers following the procedure described below.
- Fit valves and spark plugs provisionally. Take a graduated
burette containing a known amount of engine oil.
- Rest a glass sheet with four holes corresponding to the combustion
chambers on the cylinder head.
- Complete the filling of the combustion chamber, taking care
that no oil comes out of the combustion chamber.
Wait for around 10 minutes to allow the
decantation of the oil.Measure the quantity of oil remaining in
the burette and then calculate the difference between it and the quantity
of oil used initially when the burette was full; this value corresponds
to the volume of the chamber.Check that this figure corresponds to the
recommended values, or else the cylinder head has to be replaced.
| Measurement | | Value |
|---|
| - | Combustion chamber volume (cm) | | 12.28 |
Check that the valve stem does not show
signs of scoring or seizing.Check that the diameter of the valve stems
is within the recommended values; if this is not the case, replace the
worn valves.
| Measurement | | Value |
|---|
| - | Inlet and exhaust valve stem diameter (mm) | | 5.974 - 5.992 |
Check that the thickness of the cylindrical
part of the valve head is within the recommended values.
| Measurement | | Value |
|---|
| - | Valve cylindrical section thickness (mm) | | 1 |
Check that the diameter of the valve head
is within the recommended values; if this is not the case, replace
the valves.
| Measurement | | Value |
|---|
| - | Exhaust and inlet valve outer diameter (mm) | | 22.250 - 22.550 |
1. Check valve guide bore and valve clearance are within the recommended
values or else the valve guide has to be replaced.
If necessary, replace the valve guides
referring to op.
1016E14 single
cylinder head valve guides - replace during operation 1016e10
.
| Measurement | | Value |
|---|
| - | Valve guide inner diameter (mm) | | 6.022 - 6.040 |
| Measurement | | Value |
|---|
| - | Valve stem - valve guide clearance (mm) | | 0.030 - 0.066 |
Grind the valve seats if the valves and
valve guides are replaced.
| Measurement | | Value |
|---|
| - | Upper band taper "a" () | | 70° |
| Measurement | | Value |
|---|
| - | Contact band with valve taper "b" () | | 45° ± 5' |
| Measurement | | Value |
|---|
| - | Lower band taper "c" () | | 15° |
| Measurement | | Value |
|---|
| - | Contact band width with valve "I" (mm) | | c.a. 2 |
Clean the valve seats thoroughly when the
operation is complete.
Use the appropriate tool to check that
the characteristics of the springs are within the recommended values; if
this is not the case, replace parts that have yielded.
| Measurement | | Value |
|---|
| - | Spring height (mm) | | 31 |
| Under load (daN) | 22.5 |
| Measurement | | Value |
|---|
| - | Spring height (mm) | | 23 |
| Under load (daN) | 42.3 |
1. Fit the lower valve shims (1a); position the oil seals (1b) on
the valve guides, using the drift (1c) on the stem pf the valve
temporarily fitted in the seat, then fit the new oil seal on the
drift.2. Fit the oil seal in its seat using drift (2a).
| Name | Country |
|---|
| 1c | Drift | 1.860.993.000 |
| Name | Country |
|---|
| 2a | Drift | 1.860.993.000 |
Refit the valves, springs, caps and cotters
using the same tools as used for the dismantling.
| Name | Country |
|---|
| - | Lever | 1.860.790.000 |
| Name | Country |
|---|
| - | Lever hook | 1.860.788.000 |
| Name | Country |
|---|
| - | Extension | 1.860.787.000 |
| Name | Country |
|---|
| - | Valve retaining base | 1.860.786.000 |
| Name | Country |
|---|
| - | Chamber | 1.860.877.000 |
Fit the timing belt tensioner.Fit the thermostat and gasket.Remove the cylinder head from the vice.Remove the cylinder head support tool.
| Name | Country |
|---|
| - | Support | 1.860.470.000 |
