Product Description
Interstate-McBee M-3929027 Crankshaft Gear – 1989–2002 5.9L Cummins (12V & 24V)
Direct-fit crankshaft timing gear for the 5.9L Cummins B-Series (1989–2002). Manufactured to OE dimensions for proper mesh with the cam, idler, and injection pump gears. Sold individually.
- OE-style fit: Matches Cummins reference 3929027 for correct backlash and alignment.
- Durable construction: Hardened steel gear for long service life.
- Precision timing: Maintains accurate valve and injection timing when installed to spec.
- Interference fit: Designed for heat/press installation on the crankshaft nose.
Specifications
| Brand | Interstate-McBee |
| Part Number | M-3929027 |
| OEM Reference | Cummins 3929027 |
| Engine | 5.9L Cummins B-Series (12-valve & 24-valve) |
| Model Years | 1989–2002 |
| Position | Crankshaft timing gear |
| Sold As | Each (1 gear) |
| Qty Required | 1 per engine |
| Material | Hardened steel |
What’s Included
- (1) Crankshaft gear, P/N M-3929027
Vehicle Fitment
Always verify by engine serial number (ESN) when possible.
- Dodge Ram 2500/3500 with 5.9L Cummins
- 12-Valve: 1989–1998
- 24-Valve: 1998.5–2002
- Other B-Series 5.9L applications specifying Cummins 3929027 (confirm by ESN).
Recommended/Related Parts
- Camshaft gear & idler gear (timing set service)
- Injection pump gear (if worn or damaged)
- Front crankshaft seal & wear sleeve
- Timing cover gasket set
- Crankshaft key (inspect/replace if damaged)
Install Notes
- This gear is an interference/press fit. Typical service procedure involves heating the gear to expand for installation—follow the Cummins service manual.
- Align the keyway correctly; verify gear fully seats against the crank shoulder.
- After assembly, check timing marks and gear backlash according to spec.
- Use new seals/gaskets and clean, lint-free surfaces to prevent leaks.
Why Buy From CPP Diesel
- Diesel specialists with ESN-verified fitment support
- Fast shipping and competitive pricing
- Deep inventory of Cummins B-Series timing and sealing components
FAQ
Will this fit both 12-valve and 24-valve 5.9L engines?
Yes—this gear covers 1989–1998 (12V) and 1998.5–2002 (24V) applications that call for Cummins 3929027. Verify by ESN if unsure.
Do I need any special tools?
A proper puller/installer or heat-and-drop installation procedure is typically required. Follow the Cummins service manual for your engine.
Should I replace other parts at the same time?
It’s smart to inspect the cam and idler gears, the injection pump gear, the front main seal, and the timing cover gasket set while you’re in there.
