Product Description
Cummins 3929881 — Genuine Exhaust Manifold Gasket (MLS) for 5.9L 12-Valve
MPN: 3929881 | Also Known As: exhaust manifold-to-head gasket, MLS manifold gasket
Genuine Cummins multi-layer steel (MLS) gasket that seals the exhaust manifold to the cylinder head on 1989–1998 5.9L 12-valve (6BT) applications. Built to handle heat cycling and higher EGTs common in towing and performance use. Sold individually; typically 6 required per engine on 12-valve trucks.
Features & Benefits
- MLS construction resists blowouts and maintains clamp load under extreme heat.
- OE fit for quick installation with stock manifolds or quality replacements.
- Restores seal to reduce exhaust leaks, soot, and tick noises at the head flange.
- Durable coating for corrosion resistance and easier removal later.
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1989–1998 | 5.9L 12-Valve (6BT) | Ram 2500/3500 |
Industrial/Off-Highway: Broad use across B-Series families (4B/6B, ISB, QSB). Verify by ESN for non-automotive engines.
Compatibility Notes:
- 12-valve only: This gasket targets 1989–1998 5.9L 12V engines. Later 24V (1998.5–2002) and common-rail 5.9/6.7 use different gasket sets.
- Quantity varies by gasket style/manifold: many 12V setups use six individual gaskets. Check your manifold and count before ordering.
Specifications
- Type: Exhaust manifold to cylinder head gasket (MLS)
- OE Part Number: 3929881
- Material: Multi-layer stainless steel with heat-resistant coating
- Quantity Required: Sold individually; typically 6 per engine on 12V applications
Often Paired With
- Turbo-to-manifold gasket: Cummins 3901356
- Exhaust manifold hardware: bolts/spacers (e.g., Cummins 3945252 spacer) and studs/nuts as needed
What’s In The Box
- (1) Genuine Cummins Exhaust Manifold Gasket (3929881)
Installation Tips
- Remove rust/soot from mating surfaces; check manifold for warpage or cracks.
- Use correct torque sequence and re-torque after heat cycle if required by the manifold maker.
- When manifolds are off, inspect turbo studs and replace gaskets/hardware as needed.
FAQ
WILL THIS FIT MY 1989–1998 5.9L 12-VALVE CUMMINS?
Yes—3929881 is an OE manifold-to-head gasket for 5.9L 12V (6BT) Ram 2500/3500. Industrial 4B/6B/ISB/QSB engines may also use it—verify by ESN.
HOW MANY GASKETS DO I NEED?
Most 12V applications use six manifold-to-head gaskets (sold individually). Some kits bundle sets; count your ports and order accordingly.
DOES THIS FIT 24V (1998.5–2002) OR COMMON-RAIL ENGINES?
No—24V and CR engines use different gasket part numbers/sets. Choose a 24V-specific or 1998.5–2018 set instead.
IS THIS AN MLS GASKET?
Yes—3929881 is a multi-layer steel (MLS) design for better heat cycle durability and sealing performance.
IS THIS GENUINE CUMMINS?
Yes—OE Cummins part 3929881 for proper fit and durability.
