IN-SERVICE TEST REPORT|ROAD TRANSPORT|DIESEL ENGINES
REPORT OF FSBI «MOTOR TRANSPORT DEPOT», ADMINISTRATIVE DIRECTORATE OF THE PRESIDENT OF THE RUSSIAN FEDERATION · 12.09.2011
Hyundai AeroExpress buses: compression rose and evened out without teardown
PRODUCTXADO 1 Stage revitalizant gelinto the oil system · XADO revitalizant gel for injection pumps — into the fuel tank
TREATED OBJECTHyundai AeroExpress buses, 2 unitsD6CA diesel engines · reg. no. M227OO and no. M 219 OO
DOCUMENT TYPECompany report
with signatures and seal
with signatures and seal
Key result
↑1.5kgf/cm²
compression, average across all cylinders of the D6CA engines (2-3 kgf/cm² in the worn cylinders)
| EQUIPMENT | MILEAGE AT START OF WORK | MILEAGE AFTER TREATMENT | WHAT WAS MEASURED |
|---|---|---|---|
| Hyundai AeroExpress bus, reg. no. M227OO | 220 763 km | 5 437 km | Compression across the cylinders of the D6CA engine |
| Hyundai AeroExpress bus, reg. no. M 219 OO | 226 200 km | 14 621 km | Compression across the cylinders of the D6CA engine |
What the compression measurements showed
| PARAMETER | MEASURED OBJECT | RESULT |
|---|---|---|
| Compression, average across all cylinders | D6CA engines of both buses | +1.5 kgf/cm² |
| Compression in the cylinders that read lower before treatment | D6CA engines of both buses | +2-3 kgf/cm² |
| Spread of compression between cylinders | D6CA engines of both buses | Evened out |
Measurements were taken before treatment and after it was completed — at 226 200 km on M227OO and 240 821 km on M 219 OO; the engines were not disassembled.
Conclusion of the company commission
The commission of FSBI «Motor Transport Depot», Administrative Directorate of the President of the Russian Federation, recorded in the report: «The measurement results showed that after the XADO treatment, the engines of both buses displayed an increase and an evening-out of compression values across all cylinders». Averaged over all cylinders, compression rose by 1.5 kgf/cm²; in the individual cylinders that read lower before treatment, the increase came to 2-3 kgf/cm². The engines were not disassembled: the treatment was carried out to the XADO procedure by the depot's own specialists, the buses ran in normal service the whole time, and the final measurements were taken after 5 437 and 14 621 km of mileage. The largest gain came from the most worn cylinders — the coating builds up where the wear is, and compression cannot rise above the factory rating, so bringing the cylinders to a common level is the limit of what is achievable.
The results refer to Hyundai AeroExpress buses with D6CA diesel engines; on other equipment and under different operating conditions the figures may differ. The original report with signatures and seal is published in full and available for download.
Current equivalent
Revitalizant gel for diesel engines →
Industrial diesel engines — tractor, locomotive, marine and generator sets.
How such units are treated: