GAZ-3221 Gazelle: compression restored without engine teardown

Cylinder sealing was restored, compression evened out, spark plugs returned to normal colour. GAZ-3221 Gazelle route minibus, Gaztekhservis LLC. Russia · 2005.

Gaztekhservis LLC · commission: deputy director A. A. Tyumkin (chairman), chief mechanic of STO Yuzhny LLC V. V. Shcherbakov, manager G. A. Sokolov, director of LIDA LLC K. A. Krasnikov · report approved by director G. M. Verbilo

Russia · report dated 11 September 2005 · observation over 1594 km of route service

PRODUCTXADO revitalizant gelfor petrol engines, 3 tubes · Antikoks cleaner

TEST OBJECTPetrol engine, 4 cylindersGAZ-3221 Gazelle route minibus · mileage at test start 181 445 km

DOCUMENT TYPECommission test report
with signatures and stamps

Key result

↑33%

compression across cylinders, 8.0-9.2 → 10.5-11.5 atm

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

The commission of Gaztekhservis LLC recorded: “As a result of applying XADO technology, the engine operating parameters have improved. Despite the first cylinder being faulty, compression has on the whole increased by 33%.” The engine entered the test with a mileage of 181 445 km and black oily carbon deposits on the plugs of all cylinders — a worn cylinder-piston group with oil burning. The treatment was performed on the vehicle in service, without disassembly and without removing the engine. By 997 km compression had reached its final level and held to the closing measurement: 8.0-9.2 atm → 10.5-11.5 atm, with the three sound cylinders converging on a single value of 11.5 atm — sealing was restored and engine operation evened out. The driver noted lower noise and better vehicle throttle response.

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. The original report of 11 September 2005 with signatures and stamps is published in full and available for download.

Current equivalent

Revitalizant gel for petrol enginesPetrol engines
Revitalizant gel for cylinder restorationEngine cylinders, deep wear

How such units are treated: Petrol engine Cylinder-piston group

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