Specifications
| Engine | G9U 630 (low output) | G9U 630 (high output) |
|---|
| No. of cylinders/configuration | - | 4 in line | 4 in line |
| No. of valves | - | 16 | 16 |
| Capacity | cm 3 | 2463 | 2463 |
| Bore diameter | mm | 89 | 89 |
| Stroke | mm | 99 | 99 |
| Firing order | - | 1–3–4–2 | 1–3–4–2 |
| Power output | kW/rpm | 84/3500 | 107/3500 |
| Torque | Nm/rpm | 290/1600 | 320/1500 |
| Compression ratio | - | 17.10:1 | 17.10:1 |
| Engine management system | - | Bosch EDC 16 C36 | Bosch EDC 16 C36 |
| Exhaust emission standards | - | Euro IV | Euro IV |
Smoke Opacity
| Homologation Value | 0.51 m -1 |
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| Legal Maximum | 3 m -1 (70%) |
Cooling System
| Coolant quality | GM long life coolant |
Oil Circuit
| Engine oil capacity | | |
|---|
| with oil filter | l | 7.5 |
| Engine oil quality | ACEA C3 |
| Engine oil disposal | Observe national legislation |
Adjustment Values/checking Values
| Compression | Difference in pressure between individual cylinders must not exceed 100 KPa (1 bar / 14.5 psi) |
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| Pressure loss check | Maximum permissible difference in pressure loss between individual cylinders is approximately 10%. Maximum pressure loss of one cylinder must not exceed 25% |
Cylinder Head
| Cylinder head height (cylinder block joint face to cylinder head top face) | mm | 90.20 |
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| Gasket face plane surface: | | |
| Cylinder head | mm | 0.05 |
| Cylinder block (Cylinder head side) | mm | 0.06 |
| Cylinder block (Oil pan side) | mm | 0.05 |
| Note: Regrinding of the cylinder head or cylinder block is not permitted. |
| Cylinder head gasket thickness | mm | 1.21 ± 0.05 |
| Valve guide protrusion: | | |
| Intake | mm | 8.7 ± 0.15 |
| Exhaust | mm | 13.3 ± 0.15 |
| Piston protrusion | mm | 0.399 ± 0.065 |
| Note: Piston protrusion can be adjusted by installing pistons with different pin heights. |
Camshafts
| Camshaft bearing diameter | mm | 24.095 ± 0.005 |
|---|
| Camshaft journal diameter | mm | 25.05 ± 0.01 |
| Camshaft run-out | mm | 0.05 |
| Camshaft lobe height: | | |
| Inlet | mm | 40.13 |
| Exhaust | mm | 40.01 |
| Camshaft lateral play | mm | 0.05 - 0.13 |
| Camshaft radial play (using Plastigauge) | mm | 25 |
Valves
| Valve stem diameter: (D1) | | |
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| Inlet | mm | 5.9725 ± 0.0075 |
| Exhaust | mm | 5.9575 ± 0.0075 |
| Valve head diameter: (D2) | | |
| Inlet | mm | 30.6 ± 0.12 |
| Exhaust | mm | 29.5 ± 0.12 |
| Valve length: (L) | | |
| Inlet | mm | 123.2 ± 0.15 |
| Exhaust | mm | 123.0 ± 0.15 |
| Valve lift: | | |
| Inlet | mm | 7.8 |
| Exhaust | mm | 7.8 |
| Valve face angle: (A) | | |
| Inlet | - | 44° 52' ± 7' |
| Exhaust | - | 44° 52' ± 7' |
| Total mating face angle | - | 89° 45' ± 15' |
| Valve head thickness: (E) | | |
| Inlet | mm | 1.4 |
| Exhaust | mm | 1.4 |
Valve Lateral Play
| Valve lateral play: | | |
|---|
| Inlet | mm | 0.0495 ± 0.0075 |
| Exhaust | mm | 0.059 ± 0.013 |
Note. Make the valve head exceed a height (H3) of 25mm, then use a dial gauge to measure in the direction of the arrows, keeping an angle of 90° in relation to the camshaft axis. The clearance between the valve and the guide is equal to half the measured value.
Valve Seats
| Valve seat angle: | | |
|---|
| Inlet | - | 89° 30' |
| Exhaust | - | 89° 30' |
| Valve seat external diameter: | | |
| Inlet | mm | 32.31 ± 0.01 |
| Exhaust | mm | 31.11 ± 0.01 |
Valve Guides
| Valve guide length: | | |
|---|
| Inlet | mm | 50 ± 0.15 |
| Exhaust | mm | 50 ± 0.15 |
| External diameter: | | |
| Inlet | mm | 11.028 to 11.039 |
| Exhaust | mm | 11.028 to 11.039 |
| * Internal diameter: | | |
| Inlet | mm | 6.000 to 6.022 |
| Exhaust | mm | 6.000 to 6.022 |
* When installed in cylinder head
Valve Springs
| Free length | mm | 46.70 |
|---|
| Compressed length | mm | 28.00 |
| Length under load: | | |
| 185 N | mm | 40.50 |
| 215 N | mm | 39.50 |
| 245 N | mm | 38.50 |
| 350 N | mm | 35.00 |
| 450 N | mm | 32.00 |
| 483 N | mm | 31.00 |
| 515 N | mm | 30.00 |
| Internal diameter | mm | 14.10 ± 0.20 |
| External diameter | mm | 20.90 maximum |
| Coil diameter | mm | 3.20 ± 0.02 |
Piston Marking
| 1 | Piston mounting position - V towards flywheel |
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| 2 | Manufacturer's reference only |
| 3 | Height between piston pin and top of piston – see “Piston Selection” below |
| 4 | Manufacturer's reference only |
| Piston protrusion | mm | 0.399 ± 0.065 |
|---|
| Note: Piston protrusion can be adjusted by installing pistons with different pin heights. |
Piston Selection
| Piston Marking | Piston Pin Height | Comments |
|---|
| H1 | mm | 53.08 ± 0.02 | Select the correct piston from Parts and Accessories to achieve correct piston protrusion. |
| N | mm | 53.03 ± 0.02 |
| O | mm | 53.07 ± 0.02 |
| P | mm | 53.11 ± 0.02 |
| R | mm | 53.15 ± 0.02 |
| S | mm | 53.19 ± 0.02 |
| Z1 | mm | 53.18 ± 0.02 |
| Note: The only pistons available from Parts and Accessories are those with marking O or R. Pistons with other markings may be installed at engine build stage. |
| Engine Weight (Kg) |
|---|
| G9U 630 | 237.24 |
