IE A047COMMISSION TEST REPORT · SEPTEMBER 2005
GAZ-3221 Gazelle: compression restored without engine teardown
Piston-cylinder group tightness was restored, cylinder operation evened out, spark plug carbon deposits disappeared. 33 % — compression across cylinders, 8.0–9.2 → 10.5–11.5 atm (2005).
with signatures and stamps
Key result
| EQUIPMENT | MILEAGE AT TEST START | WHAT WAS MEASURED |
|---|---|---|
| GAZ-3221 Gazelle, route service, petrol engine, 4 cylinders | 181 445 km | Compression in each cylinder; condition of spark plugs |
Compression by cylinder, atm
| OBSERVATION STAGE | CYL. 1 | CYL. 2 | CYL. 3 | CYL. 4 |
|---|---|---|---|---|
| Before treatment | 9.2 | 8.5 | 8.0 | 8.5 |
| After the Antikoks cleaner | 9.0 | 10.0 | 9.5 | 9.5 |
| 231 km — 2 tubes of gel added | 9.5 | 10.0 | 10.0 | 9.8 |
| 997 km — intermediate measurement | 10.5 | 11 | 11 | 11 |
| 1594 km — final measurement | 10.5 | 11.5 | 11.5 | 11.5 |
Treatment was carried out on the vehicle in service, without disassembling the engine. The resulting gain of 33 % is the commission's assessment from the Conclusion section of the report.
Condition of spark plugs
| STAGE | WHAT THE COMMISSION RECORDED |
|---|---|
| Before treatment | Black oily carbon deposit on the insulator and electrodes — oil burning in the cylinders |
| After the test | Greyish-brown, brick-coloured deposit, i.e. normal condition |
The plug of the first cylinder retained its black deposit: the commission attributed this to a faulty valve or valve stem seal.
Commission conclusion
Current equivalent
- Revitalizant gel for petrol enginesPetrol engines
- Revitalizant gel for cylinder restorationEngine cylinders, deep wear
How such units are treated:
About this result:
Limits of this report: The results apply to the petrol engine of a GAZ-3221 vehicle with a mileage of 181 445 km in route service; with a different component condition and other operating conditions the figures may differ.