Place of Origin:
China
Brand Name:
Cum-mins
Model Number:
3789643
This HE300VG variable geometry turbocharger is released under engine maker number 3789643 and charger maker number 3789643H for the Cummins QSL 8.9-litre engine. It is supplied either as a bare charger or as a complete assembly under 4352234. Because the vane ring is driven by an electronic actuator, a unit supplied without one cannot be commissioned — a difference that is not visible in a price list.
| Product Name | Complete Turbocharger Assembly |
|---|---|
| Engine Maker Number | 3789643 |
| Charger Maker Number | 3789643H |
| Turbo Model | HE300VG, variable geometry |
| Engine | QSL, 8.9 litres |
| Complete Assembly | 4352234, with 4352233 in the same block |
| Kit Without Actuator | 6377366H, and 3789635 in the same form |
| Other Written Forms | 378964300, 378964300H, 378964300HX, 3789643HX |
| Sister Numbers | 3789642, 3789644, 3789645, 3789607, 3789608, 3789609 |
| Cross References | 170-032-3191, 170-032-3733, 170-032-3842 |
| Actuation | Electronic actuator on the vane ring |
| Warranty | 12 months quoted on the genuine packing |
| Packaging | Foam cradle, capped ports, braced carton |
| Four Ways To Write It | The bare number, the same with H, and the two with trailing zeros plus HX are one unit released through different channels, and systems quote whichever form they hold. |
|---|---|
| Assembly Versus Charger | 4352234 is the complete assembly number, so a buyer with that on the work order is not ordering the same thing as a buyer with 3789643. |
| Given Without The Actuator | 6377366H and 3789635 are the form released without the electronic actuator, which is cheaper and cannot be commissioned until one is sourced. |
| Same Engine, Other Numbers | 3789642, 3789644, 3789645, 3789607, 3789608 and 3789609 all sit beside this one, and they belong to different ratings of the same engine. |
| Vanes Against A Fixed Housing | HE300 without the VG suffix is a fixed geometry charger, so it bolts onto the same manifold and leaves the engine without the boost range the calibration expects. |
| VG Against WG | HE300WG is a wastegated unit for a different engine family, and the two letters are one keystroke apart in every catalogue. |
| Smaller Engine Numbers | 5328074 and 5327360 belong to the 6.7-litre six, which shares the charger family but not this release. |
| Caution — Calibration Follows The Charger | Vane position is commanded by the engine controller, so a charger built for another rating will run under a map that does not match it unless the calibration is changed with it. |
| Caution — Actuator Learns On Fit | A new actuator has to complete its sweep before the engine will accept it, and a unit fitted without that step throws a fault that reads like a sensor failure. |
| Caution — Soot Kills The Ring | Most failures here are sticking vanes rather than a failed bearing, so an engine burning oil or over-fuelling will destroy the replacement as well. |
| Caution — Price Spread Reflects Form | Quotes in this range differ by a factor of ten because some are for a cartridge, some for a charger without an actuator, and some for the complete assembly. |
| Related Components | Actuator, vane ring, CHRA cartridge, turbine housing, fitting kit, oil feed pipe, oil return pipe, exhaust gasket, air intake hose. |
Q1: What does the H on the end actually change?
It records which channel the unit was released through rather than what it fits. The same assembly is quoted with H, with trailing zeros and with HX, and all describe one charger. What does change the part is whether an actuator is included, and that is a separate line rather than a letter.
Q2: Why is a variable geometry charger used on this engine?
Because the vane ring lets the charger behave like a small unit at low speed and a large one at high speed, which a fixed housing cannot do across a wide band. The vanes are moved by an actuator that the controller commands, so the charger and the calibration are one system rather than two parts that happen to be bolted together.
Q3: What usually fails first on a used unit?
The vane mechanism, not the bearings. Soot from a rich mixture or from oil entering the exhaust deposits on the ring and the vanes stop travelling their full stroke, which the controller reads as underboost or overboost. A replacement fitted to an engine that is still smoking will seize in the same way, so the cause has to be dealt with first.
Q4: Which engine does this serve?
The QSL, at 8.9 litres.
Q5: Which number covers the assembly?
4352234.
Q6: Can a charger be bought without the actuator?
Yes, under 6377366H and 3789635.
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