Cummins ISB 6.7L Midrange HE351VE Turbocharger with Actuator | Holset 3786778H New
This is the Holset 3786778H, a new HE351VE variable geometry turbocharger made by Holset (Cummins Turbo Technologies) for the Cummins ISB 6.7L in medium-duty trucks. Catalogs list it for EPA07 engines, and two of them name Freightliner trucks. It is a complete turbo with the electronic actuator already fitted. It crosses to Cummins 4955397, 4955398 and 4955543, to 5322099, 5325892, 5325908, 5325909 and 5608763, and to Holset assembly numbers 3771645, 3771646, 3771649, 3771658 and 3771659. The remanufactured version of the same turbo is 3786778HX.
These turbos are replaced for a nozzle ring stuck with soot, a failed actuator, low boost, turbo speed or actuator fault codes, oil in the intake and shaft play. Because this one comes with the actuator on it, it covers a turbo failure and an actuator failure in one part. Some catalogs list this same turbo as an HE300VG, so order by the part number on your old turbo and not by the model name.
Confirm Fitment Before You Order
This is a medium-duty ISB 6.7L turbo. Ram pickups with the 6.7L Cummins take other Holset numbers, and the ISB 6.7L also uses other turbos that look alike, such as 3786775HX and 3786222HX, which replace different numbers. Send us your engine serial number and the assembly number from the old turbo data plate. Call 530-668-0818 and we will confirm the exact match at no charge before anything ships.
Specifications
| Part number | 3786778H |
| Brand | Holset |
| Condition | New, genuine, in original packaging |
| Warranty | Manufacturer’s own warranty applies. Call us and we handle the claim. |
| Type | Variable geometry turbocharger with electronic actuator |
| Turbo model | Holset HE351VE (some catalogs call it HE300VG) |
| Made by | Holset (Cummins Turbo Technologies) |
| Engine | Cummins ISB 6.7L, medium-duty truck |
| Emissions level | EPA07, as catalogs list it |
| Actuator | Included, fitted to the turbo |
| Crosses to Cummins | 4955397, 4955398, 4955543 |
| Crosses to Cummins / Holset | 5322099, 5325892, 5325908, 5325909, 5608763 |
| Remanufactured version | Holset 3786778HX |
| Shipping weight | 49 lb |
Fits / Applications
- Cummins ISB 6.7L in medium-duty (midrange) trucks
- EPA07 engines, as catalogs list this turbo
- Freightliner trucks with the ISB 6.7L, named by two catalogs
- Crosses to Cummins 4955397, 4955398 and 4955543
- Complete new turbo with actuator
- Ram pickups take other Holset numbers. Check the engine serial number.
The actuator comes fitted to the turbo. Do not use the actuator arm or housing as a handle when you lift it. Fit new gaskets, check the oil feed and drain for restriction, and clear the cause of the old failure (soot, oil supply, a foreign object) before you start the engine.
Part Numbers & Cross Reference
Holset 3786778H · Holset, remanufactured version 3786778HX · Cummins 4955397 · Cummins 4955398 · Cummins 4955543 · Cummins / Holset 5322099 · Cummins / Holset 5325892 · Cummins / Holset 5325908 · Cummins / Holset 5325909 · Cummins / Holset 5608763 · Turbo kit 4352325 · Holset assembly 3771645 · Holset assembly 3771646 · Holset assembly 3771649 · Holset assembly 3771658 · Holset assembly 3771659 · Remanufactured version, also listed as 6509442
Cross-reference numbers can change with engine serial, build year and emissions tier, so treat this list as a starting point. Send us your engine serial number and we will confirm the exact match against your build before anything ships. That check is free and takes a few minutes.
Frequently Asked Questions
Will the 3786778H fit a Ram 2500 or 3500 pickup?
It is not catalogued for Ram pickups. This is a Cummins ISB 6.7L turbo for medium-duty trucks, and Ram pickups take other Holset numbers. Call 530-668-0818 with your VIN or engine serial number and we will match it.
Which engines and trucks is the 3786778H listed for?
Catalogs list it for the EPA07 Cummins ISB 6.7L in medium-duty trucks, and two of them name Freightliner. Send us the engine serial number and the number on your old turbo and we will confirm it.
What numbers does the 3786778H cross to?
Cummins 4955397, 4955398 and 4955543, plus 5322099, 5325892, 5325908, 5325909 and 5608763 and turbo kit number 4352325. Holset assembly numbers 3771645, 3771646, 3771649, 3771658 and 3771659 cross to it as well.
How is the 3786778H different from the 3786778HX?
They are the same turbo, and both come with the electronic actuator fitted. The 3786778H is new. The 3786778HX is remanufactured by Holset and a refundable core applies to it.
Related Parts
- Looking to save? The remanufactured version: Cummins ISB 6.7L Midrange HE351VE Turbocharger with Actuator | Holset 3786778HX Remanufactured
- Looking to save? The remanufactured version: Cummins ISB 6.7L Midrange HE351VE Turbocharger without Actuator | Holset 3798382HX Remanufactured
Why Buy From Valley Fuel Injection
We are a diesel fuel-injection and turbocharger shop in Woodland, CA, rebuilding pumps, injectors and turbos on our own benches since 1993, not a drop-ship storefront. When you call, you talk to the people who test these units. We verify fitment against your engine serial, VIN or build date before anything ships, so the right part arrives the first time.
UPS to all 50 states, including Alaska and Hawaii. Your rate shows at checkout. Questions on fitment? Call 530-668-0818.
Pricing covers the unit itself. Any applicable sales tax is additional; shipping is calculated at checkout. Buying tax-exempt? Qualifying diesel repair shops, fleets, farms, and agricultural operations can purchase tax-free. Set up tax-exempt purchasing once and every qualifying order is tax-free going forward.
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