IE A090FIELD TRIAL REPORT · 29 NOVEMBER 2001
ZiL-130 bus engine: compression increased and evened out across cylinders
Compression rose across the cylinders, the spread between them closed, the engine began running more evenly. 4.1–16.7 % — compression across cylinders, 6.0–7.3 → 7.0–7.6; a gain in 6 of 7 measurements; in one, compression fell (2001).
JSC “Bus Fleet No. 1”signatures of four officials, stamps of two organisations
Key results
| EQUIPMENT | CONDITION BEFORE TREATMENT | WHAT WAS MEASURED |
|---|---|---|
| LaZ-695 bus<br/>reg. no. Z 892 AO | ZiL-130 engine no. 040690, 8 cylinders; compression uneven across cylinders, in cylinder no. 3 — below 4.0 | Compression of each cylinder: before treatment and after 2500 km of running |
Compression by cylinder: before treatment and after 2500 km of running
| CYLINDER | BEFORE TREATMENT | AFTER 2500 KM | CHANGE | GAIN |
|---|---|---|---|---|
| No. 1 | 7.5 | 7.0 | −0.5 | −6.7 % |
| No. 2 | 6.3 | 7.3 | +1.0 | +15.9 % |
| No. 3 | below 4.0 | 6.9 | — | — |
| No. 4 | 6.0 | 7.0 | +1.0 | +16.7 % |
| No. 5 | 7.0 | 7.5 | +0.5 | +7.1 % |
| No. 6 | 7.0 | 7.5 | +0.5 | +7.1 % |
| No. 7 | 7.3 | 7.6 | +0.3 | +4.1 % |
| No. 8 | 7.0 | 7.4 | +0.4 | +5.7 % |
Compression is given in the units used in the original report. Notes from the report: the drop in cylinder no. 1 is an error of the first measurement; the gain in cylinder no. 3 follows repair of the valve timing mechanism.
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 relate to the petrol ZiL-130 engine of a LaZ-695 bus under scheduled-service operation in a bus fleet; on other engines and operating modes the figures may differ.