IE B027TECHNICAL REPORT ON MEASUREMENTS BEFORE AND AFTER TREATMENT
SCANIA 143H-420 diesel: compression rose and evened out, no teardown
Cylinder compression increased and evened out, oil pressure at warmed-up idle rose. 4–24.8 % — compression across the eight cylinders, 21–26 → 24–26.3 atm; a gain in 8 of 9 measurements; in one, compression fell; 15 % — oil pressure at warmed-up idle, 4.0 → 4.6 kgf/cm² (2004).
SCANIA 143H-420DSC-1408 diesel, 8 cylinders · reg. No. 083-66 HP
before and after treatmentsignatures and stamps of the customer and the contractor, 11.03.2004
Key results
| EQUIPMENT | MILEAGE AT TEST START | WHAT WAS MEASURED |
|---|---|---|
| SCANIA 143H-420, DSC-1408 diesel, 8 cylinders | 658,120 km | Compression in each of the eight cylinders; pressure in the engine lubrication system |
Compression by cylinder — before treatment and after 5200 km
| CYLINDER | BEFORE TREATMENT, ATM | AFTER 5200 KM, ATM | CHANGE, ATM |
|---|---|---|---|
| 1 | 24.5 | 25.7 | +1.2 |
| 2 | 25 | 26.3 | +1.3 |
| 3 | 22.5 | 26 | +3.5 |
| 4 | 21 | 26.2 | +5.2 |
| 5 | 25 | 26 | +1.0 |
| 6 | 23 | 24.3 | +1.3 |
| 7 | 24 | 25 | +1.0 |
| 8 | 26 | 24 | −2.0 |
| Engine average | 23.9 | 25.4 | +1.6 |
| Spread (max − min) | 5.0 | 2.3 | −2.7 |
The largest gain came in the weakest cylinder: 21 → 26.2 atm. Compression does not rise above the factory nominal, so bringing all cylinders into one band is the limit of what is achievable.
Pressure in the engine lubrication system
| PARAMETER | BEFORE TREATMENT | AFTER 5200 KM |
|---|---|---|
| Maximum pressure, kgf/cm² | 7.0 | 7.0 |
| Idle, start of warm-up, kgf/cm² | 5.2 | 5.2 |
| Idle, after 15 min of warm-up, kgf/cm² | 4.0 | 4.6 |
| Pressure drop over warm-up, kgf/cm² | 1.2 | 0.6 |
Measurements taken with a mechanical gauge; the warm-up mode was identical before and after — 15 min at idle.
What the report recorded
Current equivalent
- Revitalizant gel for diesel enginesDiesel engines
- Revitalizant gel for cylinder restorationEngine cylinders, deep wear
How such units are treated:
About this result:
Limits of this report: The results relate to the DSC-1408 diesel of a SCANIA 143H-420 long-haul tractor unit with more than 650 thousand km on the odometer; on other equipment and with components in a different condition the figures may differ.