CASE SERIES|METALLURGY · ROAD TRANSPORT|ICE · CYLINDER-PISTON GROUP
TWO TECHNICAL TEST REPORTS ON A VEHICLE FLEET
series of 3 acts
GAZEL and ZIL 130: compression rose on both vehicles, no teardown
PRODUCTXADO compoundengines treated through the oil, without teardown and without taking the vehicles out of service
TEST OBJECTPetrol engines of the vehicle fleetGAZEL 53-25 ZPT, 4 cylinders · ZIL 130 95-36 ZPP, 8 cylinders
DOCUMENT TYPETechnical test reports,
signatures of both parties and the plant seal
signatures of both parties and the plant seal
What repeated on both vehicles
↑2.2-33.3%
compression across the cylinders of both vehicles, 7.0-9.5 → 7.4-12.0 kgf/cm²; increase in 12 of 20 readings; the rest unchanged
| VEHICLE | ENGINE | COMPRESSION BEFORE TREATMENT | WHAT WAS MEASURED |
|---|---|---|---|
| GAZEL, reg. no. 53-25 ZPT | petrol, 4 cylinders | 8.8-9.5 kgf/cm² | compression in each cylinder, oil pressure |
| ZIL 130, reg. no. 95-36 ZPP | petrol, 8 cylinders | 7.0-9.4 kgf/cm² | compression in each cylinder, oil pressure |
Compression by cylinder, kgf/cm²
| VEHICLE | CYLINDER | BEFORE TREATMENT | AFTER TREATMENT | CHANGE |
|---|---|---|---|---|
| GAZEL 53-25 ZPT | 1 | 9.0 | 11.0 | +2.0 |
| GAZEL 53-25 ZPT | 2 | 8.8 | 11.0 | +2.2 |
| GAZEL 53-25 ZPT | 3 | 9.0 | 12.0 | +3.0 |
| GAZEL 53-25 ZPT | 4 | 9.5 | 11.0 | +1.5 |
| ZIL 130 95-36 ZPP | 1 | 8.5 | 9.4 | +0.9 |
| ZIL 130 95-36 ZPP | 2 | 9.0 | 9.5 | +0.5 |
| ZIL 130 95-36 ZPP | 3 | 9.0 | 9.0 | 0 |
| ZIL 130 95-36 ZPP | 4 | 9.0 | 9.0 | 0 |
| ZIL 130 95-36 ZPP | 5 | 9.4 | 9.4 | 0 |
| ZIL 130 95-36 ZPP | 6 | 9.0 | 9.4 | +0.4 |
| ZIL 130 95-36 ZPP | 7 | 7.0 | 7.4 | +0.4 |
| ZIL 130 95-36 ZPP | 8 | 9.0 | 9.2 | +0.2 |
Gain by cylinder: 16-33 % on the GAZEL, 4-11 % on the ZIL 130. Compression cannot rise above the engine's factory rating.
Oil pressure at idle, kgf/cm²
| VEHICLE | BEFORE TREATMENT | AFTER TREATMENT |
|---|---|---|
| GAZEL 53-25 ZPT | 2.0 | 2.0 |
| ZIL 130 95-36 ZPP | 1.4 | 1.4 |
The compound is added to the oil, so pressure in the lubrication system was monitored separately: on both vehicles it stayed the same.
What the series showed
Two engines from one fleet — the four-cylinder engine of the GAZEL and the eight-cylinder engine of the ZIL 130 — were treated with the XADO compound without teardown, on vehicles in service. The result repeated on both: compression rose. On the GAZEL all four cylinders came up — from 8.8-9.5 to 11.0-12.0 kgf/cm², and the most depressed cylinder reached the level of the others. On the ZIL 130 compression rose from 7.0-9.4 to 7.4-9.5 kgf/cm², including the engine's weakest cylinder. A rise in compression means restored sealing of the cylinder-piston group, on which power output and fuel consumption depend; it cannot rise above the factory rating, so pulling the lagging cylinders up to the rest is the limit of what is attainable. Oil pressure at idle stayed the same on both vehicles — the lubrication system works as intended.
The results relate to the petrol engines of a goods vehicle fleet — GAZEL and ZIL 130 — under the plant's operating conditions; on other vehicles and duty cycles the figures may differ. The original reports with signatures and seal are published in full and available for download.
Current equivalent
- Revitalizant gel for cylinder restorationEngine cylinders, deep wear
- Revitalizant gel for petrol enginesPetrol engines
How such units are treated: