Mitsubishi S3L & S4L Specifications and Torque Settings
Mitsubishi S3L & S4L: Specifications and Torque Settings
Looking for the torque settings of the Mitsubishi S3L or S4L, or the complete technical specifications of the S3L2 and S4L2? This page lists all the values neatly in order — taken directly from the Mitsubishi workshop manual, including the head bolt tightening sequence for both the 3- and 4-cylinder versions.
Suitable for the entire series: Mitsubishi S3L, S3L2, S4L and S4L2 — used in, among others, Vetus, Solé, Caterpillar, Pel-Job, Weidemann, Mahindra, Solis, TYM and Farmtrac.
Mitsubishi S3L & S4L Technical Specifications per Model
| Specification | S3L | S3L2 | S4L | S4L2 |
|---|---|---|---|---|
| Type | Water-cooled, 4-stroke diesel | |||
| Number of cylinders | 3 | 3 | 4 | 4 |
| Combustion | Swirl chamber (indirect injection) | |||
| Valve mechanism | Overhead valves (OHV) | |||
| Bore × stroke (mm) | 78 × 78.5 | 78 × 92 | 78 × 78.5 | 78 × 92 |
| Displacement (liters) | 1.125 | 1.318 | 1.500 | 1.758 |
| Compression ratio | 22.0 : 1 | 22.0 : 1 | 22.0 : 1 | 22.0 : 1 |
| Firing order | 1-3-2 | 1-3-2 | 1-3-4-2 | 1-3-4-2 |
| Direction of rotation | Counterclockwise, viewed from the flywheel side | |||
| Length × width × height (mm) | 536 × 433 × 572 | 536 × 433 × 572 | 620 × 433 × 572 | 620 × 433 × 572 |
| Dry weight (kg) | 135 | 135 | 155 | 155 |
| Engine oil capacity (liters) | 3.7 | 4.2 | 5.4 | 6.0 |
| Coolant in engine (liters) | 1.8 | 1.8 | 2.5 | 2.5 |
Mitsubishi S3L & S4L Adjustment Values
| Adjustment point | Value | Note |
|---|---|---|
| Valve clearance intake and exhaust | 0.25 mm | Cold engine |
| Injection timing | 17° before TDC (BTDC) | |
| Injector opening pressure | 14.22–15.00 MPa (145–153 kgf/cm²) | Adjust with shim |
| V-belt deflection | 10–12 mm | At ± 98 N (10 kgf) pressure |
| Thermostat opens | 82 ± 1.5 °C | Fully open (8 mm lift) at 95 °C |
| Oil pressure at idle | 0.098 MPa (1.0 kgf/cm²) | Minimum, warm engine |
Mitsubishi S3L & S4L Torque Settings — Key Bolts
Values in newton-meters (N·m), with kgf·m and lbf·ft included. Tighten in multiple stages and always use a torque wrench.
| Component | Thread × pitch | N·m | kgf·m | lbf·ft |
|---|---|---|---|---|
| Cylinder head bolt | M10×1.75 | 83.4–93.2 | 8.5–9.5 | 61.5–68.7 |
| Valve cover bolt | M8×1.25 | 9.81–12.7 | 1.0–1.3 | 7.2–9.4 |
| Rocker arm support bolt | M8×1.25 | 9.81–19.6 | 1.0–2.0 | 7.2–14.5 |
| Pressure plate bolt | M8×1.25 | 9.8–11.8 | 1.0–1.2 | 7.2–8.7 |
| Main bearing cap bolt | M10×1.25 | 49.0–53.9 | 5.0–5.5 | 36.2–39.8 |
| Connecting rod cap nut | M9×1.0 | 32.4–37.3 | 3.3–3.8 | 23.9–27.5 |
| Flywheel bolt | M12×1.25 | 127–137 | 13.0–14.0 | 94.0–101.3 |
| Crankshaft pulley nut | M18×1.5 | 147–196 | 15.0–20.0 | 108.5–144.6 |
| Rear plate mounting bolt (7T) | M12×1.25 | 53.9–73.5 | 5.5–7.5 | 39.8–54.2 |
| Oil filter | M20×1.5 | 10.8–12.7 | 1.1–1.3 | 8.0–9.4 |
| Oil pan drain plug | M14×1.5 | 34.3–44.1 | 3.5–4.5 | 25.3–32.5 |
| Oil pressure relief valve | M22×1.5 | 44.1–53.9 | 4.5–5.5 | 32.5–39.8 |
| Glow plug | M10×1.25 | 14.7–19.6 | 1.5–2.0 | 10.8–14.5 |
| Injector retaining nut (IDI) | M16×0.75 | 34.3–39.2 | 3.5–4.0 | 25.3–28.9 |
| Injector holder (IDI) | M20×1.5 | 49.0–58.8 | 5.0–6.0 | 36.2–43.4 |
| Injection pipe nut | M12×1.5 | 24.5–34.3 | 2.5–3.5 | 18.1–25.3 |
| Thermo switch | M16×1.5 | 18.6–26.5 | 1.9–2.7 | 13.7–19.6 |
| Thermostat cover bolt | M8×1.25 | 16–20 | 1.6–2.0 | 11.8–14.8 |
| Exhaust manifold bolt | M8×1.25 | 14.7–21.6 | 1.5–2.2 | 10.8–15.9 |
Standard Bolts and Nuts
Bolts not separately listed should be tightened according to the standard table — dry, meaning no oil on the thread, fitted with a spring washer. Tolerance ± 10%.
| Size | 4T (N·m) | 7T (N·m) |
|---|---|---|
| M6×1.0 | 2.94–4.90 | 7.85–9.80 |
| M8×1.25 | 9.80–12.7 | 14.7–21.6 |
| M10×1.25 | 17.7–24.5 | 29.4–41.2 |
| M12×1.25 | 29.4–41.2 | 53.9–73.5 |
Mitsubishi S3L & S4L Head Bolt Tightening Sequence
The head bolts are tightened to 83.4–93.2 N·m , in several increasing stages and in the correct order — spiraling outward from the center. The front of the engine is on the left.
- S3L / S3L2 (11 head bolts) — top: 8-4-2-7; middle: 6-1-3-5; bottom: 10-9-11.
- S4L / S4L2 (14 head bolts) — top: 10-4-2-5-7; middle: 8-6-1-3-9; bottom: 14-12-11-13.
How to Tighten the Head Bolts
- Install clean, freely turning head bolts and tighten them by hand.
- Tighten all bolts in the specified order to about half of the final torque.
- Tighten them in the same order to the full torque of 83.4–93.2 N·m.
- After running in, check the valve clearance (0.25 mm, cold) and adjust if necessary.
Needed for the head: head bolts S3L–S4L (SKU-780007), a head gasket S4L (SKU-217) or S3L (SKU-201), and a complete gasket set.
Frequently Asked Questions
What is the torque setting for the head bolts of a Mitsubishi S3L/S4L?
83.4 to 93.2 N·m (8.5–9.5 kgf·m), tightened in multiple stages and in the prescribed order from the center outward.
What is the valve clearance of the Mitsubishi S3L/S4L?
0.25 mm for both the intake and exhaust valves, measured on a cold engine.
Should I tighten the bolts with oil or dry?
According to the workshop manual, the standard bolts and nuts should be tightened dry, meaning no oil on the thread and fitted with a spring washer.
