Specifications
| Engine | | S8U 772 |
|---|
| No. of cylinders/configuration | | 4 in line |
| No. of valves | | 8 |
| Capacity | cm 3 | 2499 |
| Bore diameter | mm | 93.0 |
| Firing order | | 1–3–4–2 |
| Stroke | mm | 92.0 |
| Power output | kW/rpm | 59/40000 |
| Torque | Nm/rpm | 155/2200 |
| Compression | | 19:1 |
| Exhaust emission standards | | Euro 97 |
Engine Speed
| No load maximum | rpm | 4600 ± 100 |
|---|
| Full load maximum | rpm | 4200 ± 100 |
Smoke Opacity
| Homologation Value | 1.6 m -1 (48 %) |
|---|
| Legal Maximum | 2.5 m -1 (64 %) |
Cooling System
| Coolant capacity (dry fill) | l | 11 |
|---|
| Coolant quality | | GM Long Life coolant |
| Thermostat start of opening | °C | 82 ± 2 |
| Thermostat full opening | °C | 92 ± 2 |
| Valve rating, coolant reservoir | bar | 1.2 |
Oil Circuit
| Engine oil capacity | | |
|---|
| with oil filter | l | 6.5 |
| without oil filter | l | 6.0 |
| between MIN and MAX | l | 1.0 |
| Engine oil quality | | ACEA B3 |
| Engine oil disposal | | Observe national legislation |
| Engine oil pressure (engine at normal operating temperature – 80°C) | idle | 0.8 bar |
| 4 100 rpm | 3.5 bar |
Oil Pump Dimensions
| Clearance between gears and casing | mm | 0.06 – 0.17 |
|---|
| Rotor axial play | mm | 0.065 – 0.131 |
| Backlash of gears | mm | 0.12 (maximum) |
Belt Tensions
| Timing belt | Automatic tensioner |
|---|
| Ribbed-V belt (alternator and water pump belt) | 292 Hz ± 10 Hz |
| Ribbed V-belt (air conditioning belt) | 130 Hz ± 6 Hz |
Adjustment Values/checking Values
| Valve clearances (cold) | | |
|---|
| Inlet | mm | 0.50 |
| Exhaust | mm | 0.50 |
| Compression | - | Difference in pressure between individual cylinders must not exceed 100 KPa (1 bar / 14.5 psi) |
| Pressure loss check | - | Maximum permissible difference in pressure loss between individual cylinders is approx. 10%. Maximum pressure loss of one cylinder must not exceed 25% |
| Idle speed (rpm) | rpm | 775 – 825 |
| Injection pump timing | - | Top Dead Centre (TDC) |
Cylinder Head Gasket
| Thickness | | With piston protrusion |
|---|
| 1.60 | mm | 0.00 – 0.85 |
| 1.70 | mm | 0.85 – 0.95 |
| 1.80 | mm | More than 0.95 |
Cylinder Head Dimensions
| Deviation of plane surface | mm | 0.05 |
|---|
| Height of cylinder head (sealing surface to sealing surface) | mm | 149.90 – 150.10 |
| Grinding allowance for plane surface | mm | minus 0.4 |
Valve Seating Reworking
| | 1st Type |
|---|
| Valve seat angle: | | |
| Inlet | - | 120° |
| Exhaust | - | 90° |
| Valve seat width: | | |
| Inlet | mm | 2.7 |
| Exhaust | mm | 2.7 |
Valve Dimensions
| Stem diameter: | | |
|---|
| Inlet | mm | 7.985 |
| Exhaust | mm | 7.985 |
| Head diameter: | | |
| Inlet | mm | 40.75 |
| Exhaust | mm | 34.30 |
Valve Spring Dimensions
| Free height | | 50.0 |
|---|
| Wire diameter | mm | 2.9 |
| Coil internal diameter | mm | 18.9 |
| Length under load (Nm): | | |
| 513 – 567 | mm | 39 |
| 998 – 692 | mm | 29 |
Camshaft Dimensions
| Journal diameters | mm | 33.934 – 33.950 |
|---|
| Camshaft bearing diameters – bearing caps installed | mm | 33.989 – 34.014 |
| Clearance between journals and bearings | mm | 0.039 – 0.080 |
| Camshaft axial play | mm | 0.020 – 0.50 |
| Cam lift: | | |
| Inlet | mm | 9.5 |
| Exhaust | mm | 10.5 |
Camshaft Followers
| Outside diameter | mm | 43.950 – 43.970 |
|---|
| Inside diameter of cam follower housing | mm | 44.000 – 44.025 |
| Clearance between cam follower and housing | mm | 0.030 – 0.075 |
Cylinder Liner Dimensions
| Cylinder liner bore diameter: | | |
|---|
| Nominal | mm | 93.000 – 93.018 |
| Repair | mm | 93.400 – 93.418 |
| Cylinder liner external diameter: | | |
| Nominal | mm | 95.900 – 95.940 |
| Repair | mm | 96.100 – 96.140 |
| Cylinder liner interference fit | mm | 0.03 to 0.10 |
Piston Dimensions
| Piston diameter: | | |
|---|
| Karl Schmid piston | mm | 92.851 – 92.909 |
| Borg Piston | mm | 92.913 – 92.927 |
| Installation position | - | Camber recess side towards fuel injectors |
| Piston clearance in bore: | | |
| Karl Schmid piston | mm | 0.073 – 0.105 |
| Borg Piston | mm | 0.051 – 0.127 |
Piston Ring Dimensions
| 1st compression ring: | | |
|---|
| Gap | mm | 0.25 – 0.55 |
| Clearance between ring and piston groove: | | |
| Karl Schmid piston | mm | 0.090 – 0.140 |
| Borgo piston | mm | 0.090 – 0.140 |
| 2nd compression ring: | | |
| Gap | mm | 0.60 – 0.85 |
| Clearance between ring and piston groove: | | |
| Karl Schmid piston | mm | 0.070 – 0.102 |
| Borgo piston | mm | 0.060 – 0.092 |
| Oil ring: | | |
| Gap | | 0.30 – 0.60 |
| Clearance between ring and piston groove: | | |
| Karl Schmid piston | | 0.055 – 0.085 |
| Borgo piston | | 0.035 – 0.070 |
Piston Pins
| Type | | Floating bearing in con-rod and piston, 2 snap rings in piston, bushing in con-rod |
|---|
| Installation | | Sliding seat |
| Diameter | mm | 32.000 |
Crankshaft Dimensions
| Crankshaft and con-rod journals: | | |
|---|
| Main journal diameter – nominal | mm | 76.187 – 76.200 |
| Con-rod journal diameter – nominal | mm | 56.520 – 56.535 |
| Crankshaft axial play | mm | 0.05 – 0.320 |
Crankshaft Repair
| Crankshaft and con-rod journals: | |
|---|
| 1st repair | Nominal diameter: -0.254 |
| 2nd repair | Nominal diameter: -0.508 |
Injection Pump
Starter
Alternator
