In the real world of diesel uptime, gaskets don’t get headlines—until they fail. Over the last year I’ve watched fleets squeeze more hours from M11/ISM/QSM platforms, and the quiet hero, frankly, is a reliable full set that seals first time and stays sealed. That’s the promise many customers say this set delivers, and from what I’ve seen on shop floors, it stacks up well.
The Full Gasket Set 4089998 B9331400 Cummins M11 10.8L (cross refs: CS54132, 081845201, WG2175286) targets Cummins M11/ISM/QSM 10.8L engines commonly found in FORD, FREIGHTLINER, INTERNATIONAL, and KENWORTH applications. In fact, the set’s MLS head gasket stack and molded rubber components seem tailored for high-cycle, stop‑and‑go fleets—municipal, regional haul, even vocational trucks. To be honest, the breadth of small seals included saves techs a second trip to the parts room.
| Head Gasket Type | MLS (Multi‑Layer Steel), 3–5 layers, nitrile/Viton coated fire ring |
| Thickness Options | ≈0.90–1.50 mm (real‑world use may vary by rebuild spec) |
| Material Set | Stainless MLS + graphite composite + FKM/NBR molded rubber + PTFE seals |
| ASTM F36 Compressibility | ≈7–12% (graphite composite inserts) |
| ASTM F38 Creep Relaxation | ≤30% @ 100°C, 22 h (typical) |
| Service Life | Often 300k–600k miles before top‑end reseal, assuming proper torque & cooling |
You’ll see the Full Gasket Set 4089998 B9331400 Cummins M11 10.8L in regional haul tractors, municipal buses, mixers, and quarry support trucks. Mechanics tell me the molded valve cover and timing cover profiles seat predictably even on slightly worn surfaces. The coating’s bite on RA 30–60 μin surfaces helps when the block deck isn’t pristine—happens more than we admit.
| Vendor | Coverage & Fit | Material Stack | Certs | MOQ/Lead Time | Warranty |
|---|---|---|---|---|---|
| Oujia Engine Parts | M11/ISM/QSM, tight tolerances | MLS+graphite+FKM/NBR | ISO 9001; IATF aligned | Low MOQ; ≈7–15 days | 12 months limited |
| OEM Dealer | Exact OE | OE MLS & elastomers | OE standards | Stock‑dependent; higher cost | 12–24 months |
| Budget Aftermarket | Varies | Mixed composites | Limited | Fast ship | Shorter |
Regional haul fleet (45 units): after 18 months on the Full Gasket Set 4089998 B9331400 Cummins M11 10.8L, top‑end oil seep incidents dropped to near zero; one unit flagged for coolant weep traced to liner protrusion, not the gasket—worth mentioning.
Quarry service truck: repeated dust ingestion led to early tear‑down; reused the same vendor set on rebuild, leakdown stayed stable through four thermal cycles. Surprisingly resilient coating after cleaning.
Customer voice: “It sealed on the first fire-up and stayed dry after the first 1,000 miles shakedown. We’d spec it again.” That’s the sort of feedback I keep hearing.
