Product Description
Cummins 3927305 — Genuine Thermostat Housing Cover Gasket
MPN: 3927305 | Also Known As: thermostat cover gasket, thermostat housing gasket
Stop coolant seepage at the thermostat cover on your second-gen. This genuine Cummins housing cover gasket is a direct-fit seal for 1994–1998 Ram 2500/3500 5.9L 12-valve (P7100). Built to OE specs for a reliable, leak-free seal.
Features & Benefits
- OE sealing geometry for a precise fit and long service life.
- Direct-fit replacement — no trimming or sealant blobs required.
- Prevents coolant leaks that can cause temp fluctuations and mess.
- Genuine Cummins materials for consistent compression and recovery.
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1994–1998 | 5.9L 12V (P7100) | Ram 2500/3500 |
Industrial/Off-Highway: Listed by Cummins for Euro II / B-Series 5.9L usage — verify by ESN on non-automotive engines.
Compatibility Notes:
- Pairs with the thermostat O-ring 3925466 and 180° thermostats 3934373 or 3928499 on ’94–’98 12-valve trucks.
- For 1989–1993 first-gen trucks, see the earlier thermostat/gasket set (e.g., 5292738 + 3923331).
Specifications
- Type: Thermostat housing cover gasket (upper cover to housing)
- OE Part Number: 3927305
- Quantity Required: 1 per service
Often Paired With
- Thermostat O-ring: 3925466 (’94–’98)
- Thermostat (180°): 3934373 or 3928499 (’94–’98)
- Fresh coolant: refill/bleed after service
What’s In The Box
- (1) Genuine Cummins Thermostat Housing Cover Gasket (3927305)
Installation Tips
- Drain coolant below the thermostat level; clean mating surfaces thoroughly.
- Use new 3925466 O-ring with the thermostat; place 3927305 between the cover and housing.
- Torque fasteners evenly to spec; refill coolant and bleed air. Recheck for leaks after warm-up.
FAQ
WILL THIS FIT MY 1994–1998 5.9L 12-VALVE?
Yes—3927305 is the OE thermostat housing cover gasket for ’94–’98 Ram 2500/3500 5.9L 12-valve.
WHAT OTHER SEALS DO I NEED?
Use 3925466 (thermostat O-ring). Many owners also replace the 180° thermostat (3934373 or 3928499) during service.
DOES THIS FIT FIRST-GEN (1989–1993) OR 24-VALVE/COMMON-RAIL?
First-gen and later engines use different gaskets/thermostats. Check by VIN/ESN for the correct part numbers.
IS THIS A GENUINE CUMMINS PART?
Yes—OE Cummins 3927305.
WHY REPLACE THIS WHEN DOING A THERMOSTAT?
Old paper/composite gaskets crush and harden; reusing them risks leaks. A fresh OE gasket ensures a reliable seal.
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Exactly what I needed
Exactly what I needed, I imagine that they’re different set ups as cummins are in so many different vehicles, but I was having trouble finding the correct thermostat gasket set for tomorrow 95 Dodge 2500. This set is perfect for a 12 valve Cummins with the engine lift hook between the block and the thermostat housing
