PRODUCTION CASE|ROAD TRANSPORT · PASSENGER SERVICES|DIESEL · FUEL INJECTION EQUIPMENT

ACT AND MEMO OF THE DIAGNOSTIC STATION

SISU bus: fuel pump treatment raised power without teardown

JSC “Avtokolonna No. 1118” · diagnostic engineer M. I. Dombrich · production engineering dept. engineer D. N. Voronin, diagnostic station technician M. V. Nikolaev

Diagnostics 15.08 · 30.08 · 14.09.2001 · act dated 04.10.2001

PRODUCTXADO restoration gelSingle treatment of the fuel injection equipment — one tube, no disassembly of the injection pump

TEST OBJECTSISU bus, reg. No. 216Diesel, 6 cylinders · injection pump, plunger pairs

DOCUMENT TYPEAct dated 04.10.2001
and memo of the diagnostic station“Approved” endorsement by the technical director of the enterprise

Key results

↑18.2%

power under load in 4th gear, 110 → 130 kW

↑10%

power under load in 5th gear, 100 → 110 kW

EQUIPMENT	CONDITION BEFORE TREATMENT	WHAT WAS MEASURED
SISU bus, reg. No. 216<br/>diesel, 6 cylinders	Heavy black smoke, signs of wear of the injection pump plunger pairs, the vehicle does not hold load at 50 km/h	Power under load in 4th and 5th gear, injection pressure and duration, idle speed

Power under load

PARAMETER	BEFORE TREATMENT	AFTER TREATMENT	CHANGE
Power in 4th gear, N₄	110 kW	130 kW	+20 kW
Power in 5th gear, N₅	100 kW	110 kW	+10 kW
Minimum idle speed	610 rpm	660 rpm	+50 rpm

The same power values are independently stated both in the act and in the memo of the diagnostic station.

Fuel injection parameters

IDLE MODE	PARAMETER	BEFORE	AFTER
577 → 600 rpm	Maximum injection pressure, Pmax	14.6 MPa	15.1 MPa
1100 → 1110 rpm	Maximum injection pressure, Pmax	15.7 MPa	15.8 MPa
1100 → 1110 rpm	Injection duration, T	1.5 ms	1.0 ms

Injection pressure is held by the worn plunger pair — the rise in Pmax is itself the sign of restored pair geometry, and it is what delivers the power gain.

Engine condition before and after treatment

INDICATION	BEFORE TREATMENT	AFTER TREATMENT
Smoke during power measurement	Heavy, black in colour	Moderate, grey-blue in colour
Behaviour under load	“Absolutely does not hold load at 50 km/h”	Power gain in both measured gears
Injection oscillogram	Significant wear of the injection pump plunger pairs	“Signs of plunger pair wear have disappeared”

Smoke was assessed visually by colour and intensity of the exhaust during the power measurement.

Conclusion of the enterprise diagnostic station

The diagnostic station of JSC “Avtokolonna No. 1118” recorded: “compared with the technical condition as of 15.08 the bus has gained a certain amount of additional power as a result of applying XADO technology; changes in the fuel injection oscillogram can also be noted, indicating a slight restoration of the friction surface of the plunger pairs”. Before the treatment the vehicle emitted heavy black smoke, the oscillogram showed significant wear of the injection pump plunger pairs, and under load the bus “absolutely does not hold load at 50 km/h”. One tube of gel, with no disassembly of the fuel injection equipment, gave power under load of 110 → 130 kW in 4th gear and 100 → 110 kW in 5th, while smoke became moderate and grey-blue in colour.

The results refer to the diesel engine of a SISU bus after a single treatment of the fuel injection equipment; on other equipment and with a different condition of the units the figures may differ. The act dated 04.10.2001 and the memo of the diagnostic station are published in full and available for download. In the 2001 document the compound is called a repair-and-restoration compound (XADO RVS): RVS is an outdated XADO designation, zero-generation compounds; the current product generation is revitalizants.

Current equivalent

XADO “Restorative” greaseFriction pairs · joints
Revitalizant gel for diesel enginesDiesel engines

How such units are treated: Diesel engine

← Full catalogue