CASE SERIES|METALLURGY · ROAD TRANSPORT|TRUCKS · INTERNAL COMBUSTION ENGINES
REPORTS OF VEHICLE FLEET No. 13 · OCTOBER 2008 — FEBRUARY 2009
series of 2 acts
ZIL 130 and ZIL 131: compression evened out without engine teardown
PRODUCTXADO revitalizant gel
for gasoline enginesfull cycle — 3 stages of dosing into the oil sump; XADO VitaFlush cleaner, VERYLUBE ANTIKOKS
for gasoline enginesfull cycle — 3 stages of dosing into the oil sump; XADO VitaFlush cleaner, VERYLUBE ANTIKOKS
TEST OBJECTSTwo trucks
ZIL 130 and ZIL 131gasoline eight-cylinder engines, cylinder-piston group
ZIL 130 and ZIL 131gasoline eight-cylinder engines, cylinder-piston group
DOCUMENT TYPETwo technical reports
of the plant, 20.03.2009
of the plant, 20.03.2009
Key result
compression evened out across the cylinders
| VEHICLE | MILEAGE AT START | MILEAGE OVER CYCLE | WHAT WAS MEASURED |
|---|---|---|---|
| ZIL 130, plate No. AE 9334 AA | 29 396 km | 5 668 km | Compression in all eight cylinders before and after treatment |
| ZIL 131, plate No. AE 0994 AT | 11 550 km | 10 450 km | Compression in all eight cylinders before and after treatment |
Compression by cylinder, kgf/cm² — both vehicles side by side
| CYLINDER | ZIL 130 BEFORE | ZIL 130 AFTER | ZIL 131 BEFORE | ZIL 131 AFTER |
|---|---|---|---|---|
| I | 8.0 | 7.7 | 7.3 | 7.5 |
| II | 7.5 | 8.1 | 5.5 | 7.3 |
| III | 6.8 | 7.0 | 7.3 | 7.7 |
| IV | 6.9 | 7.7 | 8.0 | 8.1 |
| V | 8.8 | 8.3 | 7.3 | 7.6 |
| VI | 8.3 | 8.3 | 7.4 | 7.6 |
| VII | 6.8 | 7.5 | 7.3 | 7.5 |
| VIII | 8.7 | 8.4 | 7.5 | 7.8 |
| Spread | 2.0 | 1.4 | 2.5 | 0.8 |
ZEGA 362 compression tester; spread is the difference between the highest and the lowest cylinder of the engine. The rise in compression is capped by the manufacturer's nominal value.
What changed on each vehicle
| VEHICLE | CYLINDER-TO-CYLINDER SPREAD | LARGEST GAIN IN A SINGLE CYLINDER | MILEAGE OVER CYCLE |
|---|---|---|---|
| ZIL 130 | 2.0 → 1.4 kgf/cm² | 0.8 kgf/cm² — cylinder IV (was 6.9) | 5 668 km |
| ZIL 131 | 2.5 → 0.8 kgf/cm² | 1.8 kgf/cm² — cylinder II (was 5.5) | 10 450 km |
On the ZIL 131 compression rose in all eight cylinders, on the ZIL 130 — in the four most worn ones: the coating builds up where the wear was.
Conclusions of the plant reports
The commission of OJSC ArcelorMittal Kryvyi Rih recorded the same thing on both vehicles: after the full treatment cycle of the oil system, repeat measurements established that compression had evened out across all cylinders. For the ZIL 130 — "in individual cylinders the compression value rose by 0.2-0.8 kgf/cm²". For the ZIL 131 — "in the second cylinder the compression value rose by 1.8 kgf/cm², which indicates the elimination of significant wear on the working surface of this cylinder": that cylinder was the weakest in the engine, 5.5 kgf/cm² before treatment. Evening out compression across the cylinders, according to the conclusion of both reports, removes crankshaft imbalance and helps extend engine service life. Both results were obtained on vehicles in normal service, without disassembling the engines or taking them off the line.
The results refer to the gasoline engines of the ZIL 130 and ZIL 131 trucks of Vehicle Fleet No. 13 at OJSC ArcelorMittal Kryvyi Rih; on other equipment and under different operating conditions the figures may differ. The originals of both reports 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: