Product Description
Interstate-McBee M-3008400 Vacuum Pump Mounting Gasket – 1989–2002 5.9L Cummins (12-Valve & 24-Valve)
Direct-fit vacuum pump mounting gasket for Dodge Ram 2500/3500 trucks equipped with the 5.9L Cummins (6BT/ISB) from 1989–2002. Seals the vacuum pump to the mounting surface to prevent oil and vacuum leaks. Sold individually.
- OE-style fit: Matches the factory profile for a clean, leak-free install.
- Durable material: Designed for oil exposure and temperature cycling at the front timing case.
- Service-friendly: Ideal when servicing or replacing the vacuum/power steering pump assembly.
- Value: Interstate-McBee quality at an aftermarket price.
Specifications
| Brand | Interstate-McBee |
| Part Number | M-3008400 |
| OEM Reference | Cummins 3008400 |
| Application | Vacuum pump mounting gasket |
| Sold As | Each (1 gasket) |
| Material | OE-style gasket composite |
What’s Included
- (1) Vacuum pump mounting gasket, P/N M-3008400
Vehicle Fitment
Confirm fitment by engine serial number (ESN) when possible.
- Dodge Ram 2500/3500 5.9L Cummins
- 12-Valve (6BT): 1989–1998
- 24-Valve (ISB): 1998.5–2002
- Other B-Series applications where Cummins 3008400 is specified (verify by ESN).
Install Notes
- Clean both mating surfaces thoroughly; remove old gasket material and oil residue.
- Dry-fit the gasket to ensure orientation; install without tearing or stretching.
- Follow factory torque specs for the vacuum pump fasteners.
- After reassembly, check for oil seepage and verify proper vacuum operation.
Recommended/Related Parts
- Vacuum pump to power steering pump O-rings/seals (if serviced concurrently)
- Power steering pump shaft seal kit (common while unit is off the engine)
- Front cover/timing case gasket or RTV (if disturbed during service)
- Fresh engine oil for top-off after repair
Why Buy From CPP Diesel
- Diesel-specialist support with ESN verification
- Fast shipping and easy returns
- Large inventory of complementary Cummins B-Series parts
FAQ
Where does this gasket go?
It seals the vacuum pump to its mounting surface at the front of the engine. It’s commonly replaced when servicing the vacuum/power steering pump assembly.
Do I need sealant?
Generally no—install the dry gasket on clean, flat surfaces and torque to spec. Use sealant only if specified by your service manual.
Will it fit both 12V and 24V 5.9L Cummins?
Yes—this listing covers 1989–1998 (12-valve) and 1998.5–2002 (24-valve) applications where Cummins 3008400 is called out. Verify by ESN for edge cases.
