Product Description
Interstate-McBee M-3938655 Vacuum Pump-to-Gear Housing Gasket — 1989–1993 5.9L Cummins
Restore a proper seal between the vacuum pump and the gear housing (accessory drive cover) on your 1989–1993 Dodge Ram 2500/3500 5.9L Cummins. The Interstate-McBee M-3938655 is an OEM-style, aftermarket replacement engineered for a clean, leak-free install.
- Direct-fit replacement: Matches Cummins 3938655 specifications for first-gen 5.9L.
- Leak prevention: Properly seals the vacuum pump to the gear housing to help stop oil seepage.
- Aftermarket value: Interstate-McBee quality at a budget-friendly price point.
- Clear application: Purpose-built for 1989–1993 Dodge 5.9L Cummins trucks.
Specifications
| Brand / Part No. | Interstate-McBee M-3938655 |
|---|---|
| OEM Cross-Ref | Cummins 3938655 (also referenced: 3931608, 3919601, 3913192) |
| Also Called | Accessory Drive Cover Gasket; Vacuum Pump to Gear Housing Gasket |
| Position | Vacuum pump ↔ gear housing (front cover) |
| Contents | (1) Gasket |
Vehicle Fitment
Always verify by engine serial number (ESN) if possible.
- Dodge Ram 2500/3500 — 5.9L Cummins (12-Valve 6BT)
- Model Years: 1989–1993 (First-Gen)
Install Notes
- Clean both mating surfaces; remove all old gasket material without scratching the sealing faces.
- Dry install unless the Cummins service manual specifies a sealant for your ESN/configuration.
- Follow factory torque and sequence for the vacuum pump fasteners.
- Inspect the pump assembly for shaft/play issues if recurring leaks are present.
Warranty
New Interstate-McBee parts include manufacturer warranty coverage. Contact us for current terms and claim procedures.
Why Buy From CPP Diesel
- First-gen Cummins expertise with ESN-verified fitment support
- Fast shipping and hassle-free returns
- One-stop solutions: related seals, pumps, and gear-housing components
FAQ
Will this fit my 1989–1993 5.9L Cummins?Yes. This gasket targets first-gen Dodge 5.9L Cummins applications from 1989 through 1993.
Is M-3938655 the same as Cummins 3938655?
Functionally yes—M-3938655 is an aftermarket, OEM-style replacement that cross-references to Cummins 3938655.
Do I need RTV or sealant?
Install per the Cummins service manual. Most applications use a clean, dry surface; use sealant only where the manual calls for it.
Will this fix oil leaks at the vacuum pump?
It addresses leaks at the pump-to-gear-housing joint. If leaks persist, inspect the pump assembly and adjacent seals.
Does this gasket fit 1994–2002 trucks?
This listing is focused on 1989–1993. Some catalogs show similar coverage under 3938655—verify by ESN for later years.
Product Videos
Custom Field
YEAR 1989-1993
MAKE DODGE
ENGINE 5.9L
