PAZ-3205 buses — Mostransavto, Avtokolonna 1785

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CASE SERIES|PASSENGER ROAD TRANSPORT|PETROL ENGINES · PISTON GROUP

THREE TECHNICAL MEASUREMENT REPORTS · JUNE 2000

series of 3 acts

PAZ-3205 bus engines: compression rose without teardown, CO emissions fell

Mostransavto branch «Avtokolonna 1785», motor squad No. 4  ·  reports approved by the branch chief engineer I. N. Kozlov, signed by the driver, the engine mechanic and the squad head

Shchyolkovo, Moscow Region  ·  reports of 06.06 and 08.06.2000  ·  control measurements after 1542, 5866 and 9892 km of service

PRODUCTXADO revitalizantin the reports — «treatment by XADO technology™» · engine treated without teardown
TEST OBJECTPAZ-3205 busestwo vehicles: reg. No. V 233 MK and E 441 MS · petrol V-type engine, two banks of 4 cylinders
DOCUMENT TYPETechnical reports on measured
operating parametersthree reports signed and stamped by the depot branch and by the contractor

What repeated on both vehicles

↑5.8-61.4%
compression by cylinder, 5.6-9.0 → 6.9-10.1 kgf/cm²
↓2.3-6.3×
CO content in the exhaust gases, 1.0-3.4 → 0.16-1.45 %
BUSMILEAGE AT STARTMILEAGE AFTER TREATMENTREPORT DATEWHAT WAS MEASURED
PAZ-3205,<br/>V 233 MK95 427 km1542 km08.06.2000Compression on all 8 cylinders, running time on 100 g of petrol, oil pressure, CO and CH
PAZ-3205,<br/>V 233 MK95 427 km5866 km06.06.2000The same, plus oil pressure at 2000 rpm
PAZ-3205,<br/>E 441 MS36 156 km9892 km08.06.2000Compression on all 8 cylinders, running time on 100 g of petrol, oil pressure, CO and CH

Cylinder compression — at each control measurement

BUS · MILEAGE AFTER TREATMENTBEFORE, kgf/cm²AFTER, kgf/cm²CHANGE
V 233 MK · 1542 km5.6-6.96.9-7.6+6-29 %, gain in all 8 cylinders
V 233 MK · 5866 km5.6-6.98.7-9.5+35-61 %, gain in all 8 cylinders
E 441 MS · 9892 km7.6-9.09.6-10.1+9-28 %, gain in all 8 cylinders

The spread between cylinders narrowed from 1.3-1.4 to 0.5-0.8 kgf/cm²: the weakest cylinders caught up with the strongest, and the gain runs into the factory nominal value.

Fuel consumption — engine running time on a measured 100 g portion of petrol

BUS · MILEAGE AFTER TREATMENTBEFORE TREATMENTAFTER TREATMENT
V 233 MK · 1542 km2 min 36 s3 min 24 s
E 441 MS · 9892 km3 min 9 s4 min 13 s

On one and the same measured portion of petrol the engine runs longer — the same work takes less fuel.

Exhaust gas toxicity

BUS · MILEAGE AFTER TREATMENTCO, BEFORE → AFTER, %CH, BEFORE → AFTER, ppmCO / CH REDUCTION
V 233 MK · 1542 km1.0 → 0.182400 → 160082 % / 33 %
V 233 MK · 5866 km1.0 → 0.162400 → 140084 % / 42 %
E 441 MS · 9892 km3.4 → 1.452100 → 120057.4 % / 42.8 %

The reduction percentages are given exactly as recorded in the conclusions of the reports themselves; the source pairs of values stand alongside.

Oil pressure in the lubrication system

BUS · MILEAGE AFTER TREATMENTMODEBEFOREAFTER
V 233 MK · 1542 kmIdle speed, 80 °C0.2 kgf/cm²0.35 kgf/cm²
V 233 MK · 5866 kmIdle speed, 80 °C0.2 kgf/cm²0.5 kgf/cm²
V 233 MK · 5866 km2000 rpm0.4 kgf/cm²1.8 kgf/cm²
E 441 MS · 9892 kmIdle speed, 80 °C0.7 kgf/cm²1.0 kgf/cm²

Higher oil pressure on a warmed-up engine is a sign of restored clearances in the pump: it holds pressure again.

What the reports record

Three depot reports record one and the same result on two buses: compression rose in all eight cylinders of each engine, the spread between cylinders narrowed from 1.3-1.4 to 0.5-0.8 kgf/cm², and the CO content in the exhaust gases fell several times over — the reports state a CO emission reduction of 82 % and 84 % on V 233 MK and 57.4 % on E 441 MS. The vehicles were worn: on V 233 MK, at a mileage of 95 427 km, the weakest cylinders held 5.6-5.9 kgf/cm². The recovery was obtained without teardown, on buses that kept working on the line. On V 233 MK the first check was made before the process had finished — «the treatment is considered complete after 3500 km of running» — and by 5866 km the compression of the same engine had risen from 6.9-7.6 to 8.7-9.5 kgf/cm². The drivers of both vehicles noted that the bus ran quieter and gained noticeably in throttle response.

The results refer to the petrol engines of PAZ-3205 buses of the Mostransavto branch «Avtokolonna 1785» at the stated mileages; on other equipment and under other operating modes the figures may differ. The originals of the three technical reports, with signatures and stamps, are published in full and available for download.

Current equivalent

How such units are treated: Cylinder-piston groupPetrol engine

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