Truck and bus diesels: compression and geometry restored without teardown

Universalneftekhim Testing Laboratory, VTII LLC · NAAU accreditation certificate No. 2T 495, DSTU ISO/IEC 17025:2006 · laboratory head: P. V. Karnozhitskiy

Kharkiv, Ukraine · testing 18.01.2011 – 25.01.2014 · report 11.02.2014

PRODUCTXADO MAXIMUM FOR DIESEL TRUCKatomic metal conditioner with 1 STAGE revitalizant · 950 ml pack · TU U 24.6-31233443-005:2010

TEST OBJECTSSix vehicles in regular servicefour-stroke diesels MAN, DAF, KamAZ, LAZ · mileage from 71,000 to 1.9 million km

DOCUMENT TYPETest report by an
accredited laboratory

Key results

↑10.75%

compression by cylinder, 18-29 → 26-31 bar

↓2.95%

fuel consumption, highway cycle, 25.8 → 25.1 l/100 km

↓15.7%

exhaust smoke opacity, 1.438 → 1.21 m⁻¹

↓0.04mm

worn cylinder bore diameter, 128.12 → 128.08 mm

VEHICLE	MILEAGE AT TEST START	WHAT WAS MEASURED
MAN TG-A	743,800 km	Compression, per cylinder
LAZ-52528 bus	71,363 km	Compression, per cylinder
MAN F2000	630,740 km	Compression, cylinder geometry
KamAZ-53202	520,640 km	Oil system pressure
MAN ME220-18.220	793,252 km	Smoke opacity, fuel consumption
DAF GAG 85.430	1,885,900 km	Metal wear particles in oil

Compression by cylinder — three engines

ENGINE	BEFORE TREATMENT	AFTER TREATMENT
MAN TG-A, 6 cylinders	28-29 bar	31 bar in every cylinder
LAZ-52528 bus, 8 cylinders	22.6-28.5 bar	28-29.5 bar
MAN F2000, 6 cylinders	18-24 bar	26-27 bar
Cylinder-to-cylinder spread, average	3.5 bar	0.8 bar

ZECA 363 and Motometer compression testers. Compression is capped by the engine's rated value: all cylinders reaching one and the same figure is the limit of what is achievable.

Cylinder geometry — micrometry along the mileage

MEASUREMENT ZONE	BEFORE, 631,612 KM	AFTER, 637,155 KM	AFTER 272,587 KM
Upper zone, 40 mm	128.12 mm	128.08 mm	128.09 mm
Middle zone, 150 mm	128.10 mm	128.06 mm	128.06 mm

Averages over six cylinders, two measurement axes. The smaller diameter is the coating grown in the worn zone; over the next 272,587 km the size holds.

Smoke opacity and fuel consumption — MAN ME220-18.220 tractor unit

PARAMETER	BEFORE	AFTER	CHANGE
Smoke opacity, absorption coefficient K	1.438 m⁻¹	1.21 m⁻¹	−15.7 %
Fuel consumption, highway cycle	25.8 l/100 km	25.1 l/100 km	−2.95 %

Smoke opacity to DSTU 4276-2004, fuel consumption to GOST 20306-90, highway cycle driven on the road.

Oil system pressure — KamAZ-53202

MODE	BEFORE TREATMENT	AFTER TREATMENT
Idle, 600 rpm	1.3 bar	1.5 bar
Working speed, 2000 rpm	3.7 bar	4.2 bar

Measured to GOST 14846-81. The pressure rise is a sign of restored clearances in the crankshaft bearings.

Metal wear particles in oil — DAF tractor unit, 1.9 million km

METAL, mg/kg	186,000 KM	249,000 KM	279,000 KM	314,000 KM
Iron Fe	136	70	49	49
Copper Cu	38	38	36	23
Nickel Ni	15	22	18	0
Lead Pb	12	0	6	10
Total	201	130	109	82

Oil samples to GOST 27860-88. The anti-wear properties of the oil were retained over 128,000 km of running.

Laboratory conclusion

The Universalneftekhim Testing Laboratory of VTII LLC recorded the following for the selected group of trucks: 1. An increase in compression of 10.75 % and a reduction of its cylinder-to-cylinder spread from 3.5 to 0.8 bar. 2. Restoration of the geometric dimensions of worn rubbing engine parts: cylinders (diameter reduction) by 0.04 mm; connecting-rod journals of the crankshaft (diameter increase) by 0.03 mm. Retention of the restored dimensions over no less than 250,000 km of running. 3. A reduction in exhaust gas toxicity (smoke opacity) of 15.7 %. 4. A reduction in fuel consumption of 4.15 % in steady-state driving modes and of 2.95 % in the highway cycle. 5. A reduction in the total content of metal wear particles in the oil by 2.5× and retention of anti-wear properties over 128,000 km of running.

The results relate to four-stroke diesels of trucks and a bus tested in regular service in 2011–2014; on other engines and duty modes the figures may differ. The original test report of the Universalneftekhim Testing Laboratory of VTII LLC, with signature and stamp, is published in full and available for download.

Current equivalent

Revitalizant gel for diesel enginesDiesel engines
Revitalizant gel for cylinder restorationEngine cylinders, deep wear

How such units are treated: Internal combustion engine Cylinder-piston group

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