Product Description
Interstate-McBee M-3938156 Timing Gear Housing Gasket – 1989–2002 5.9L Cummins
Direct-fit timing gear housing (front cover housing) gasket for the 5.9L Cummins B-Series. Designed as an OE-style replacement for a reliable seal between the timing gear housing and engine block. Sold individually.
- OE-style fit: Matches factory profile and bolt pattern for the 5.9L Cummins.
- Quality materials: Interstate-McBee aftermarket replacement built for long service life.
- Service-friendly: Ideal when resealing for front main, KDP repair, or timing component service.
Specifications
| Brand | Interstate-McBee |
| Part Number | M-3938156 |
| OEM Reference | Cummins 3938156 |
| Location | Timing Gear Housing (Front Cover Housing) to Block |
| Sold As | Each (1 gasket) |
Vehicle/Engine Fitment
Always verify by engine serial number (ESN) when possible.
- 5.9L Cummins B-Series (6BT / ISB) – Dodge Ram 2500/3500
- 12-Valve: 1989–1998
- 24-Valve: 1998.5–2002
- Other B-Series applications where Cummins 3938156 is specified (confirm by ESN).
What’s Included
- (1) Timing gear housing gasket, P/N M-3938156
Recommended/Related Parts
- Front crankshaft (front main) seal
- Timing cover seal
- Thermostat housing gasket / coolant neck gasket
- RTV silicone (for specified joint corners per Cummins service procedure)
- Replacement hardware as needed
Install Notes
- Disconnect batteries, drain coolant as required, and remove accessories/cover to access the housing.
- Thoroughly clean mating surfaces; remove all old gasket material and residue.
- Dry-fit to confirm alignment; use guide studs if helpful.
- Apply a small amount of RTV only where the service manual specifies (case split/joint corners).
- Torque fasteners in a cross pattern to factory specs; recheck after initial heat cycle if applicable.
Why Buy From CPP Diesel
- ESN-verified fitment support from diesel specialists
- Fast shipping and easy returns
- Deep inventory for Cummins B-Series maintenance and rebuilds
FAQ
Does this fit both 12-valve and 24-valve 5.9L Cummins?
Yes. It covers 1989–1998 12-valve and 1998.5–2002 24-valve 5.9L applications where Cummins 3938156 is specified. Always verify by ESN.
Is the front main seal included?
No, this listing is for the timing gear housing gasket only. Order the front crankshaft seal separately.
Do I need RTV?
Use RTV sparingly at the joint corners as called out in the Cummins service manual. Do not coat the entire gasket.
