Cummins B & C Series Injector Dust Seal, Pack of 6 | DIPACO D3909886 New
This is the DIPACO D3909886, a new injector dust seal, sold as a pack of 6. It replaces Cummins 3909886. Alliant names it a multi-purpose O-ring.
DIPACO’s bulletin FI-106 lists it in its injector installation kits for the Cummins B and C series engines: one dust seal per injector. DIPACO added it to its six-cylinder kit in 2001.
A pack of 6 covers one six-cylinder engine.
Confirm Fitment Before You Order
DIPACO lists this part for Cummins B and C series injector installation. Send us your engine serial number if you are not sure. Call 530-668-0818 and we will confirm the exact match at no charge before anything ships.
Specifications
| Part number | D3909886 |
| Brand | DIPACO |
| Condition | New, genuine, in original packaging |
| Warranty | Manufacturer’s own warranty applies. Call us and we handle the claim. |
| Type | Injector dust seal |
| Pack | 6 seals |
| Engines | Cummins B and C series, as DIPACO lists it |
| Per injector | One, per DIPACO’s kit list |
| Replaces | Cummins 3909886 |
| Shipping weight | 0.1 lb |
Fits / Applications
- Cummins B and C series injectors, one per injector, per DIPACO bulletin FI-106
- Bosch 0 432 191 642 injector for the Cummins 6CT 8.3L C series, on this site
Follow the workshop manual for your engine when you fit this part.
Part Numbers & Cross Reference
DIPACO D3909886 · Cummins 3909886
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
How many come in the pack?
Six, enough for one six-cylinder engine.
How many do I need?
DIPACO’s kit list uses one per injector.
Will it fit my engine?
DIPACO lists it for the Cummins B and C series. Call 530-668-0818 with your engine serial number and we will confirm it.
Related Parts
- Cummins 6CT 8.3L C Series Mechanical Fuel Injector (3926120, 3802485) | Bosch 0432191642 New
- Cummins B & C Series Injector Banjo Connector, Pack of 25 | DIPACO D3903380 New
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. Call us with your engine serial, VIN or build date before you order and we will help you confirm fitment, 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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