Product Description
Keep your first-gen and early second-gen 5.9L 12-valve alive with a genuine Cummins 3901306 OEM camshaft bushing. This front cam bearing supports the camshaft in early B-Series blocks and keeps valve timing stable under towing, performance, and daily-driving abuse. Designed by Cummins for OE-level oil control and long service life, this bushing is the right choice when you’re refreshing a high-mileage 5.9L or building a reliable workhorse.
Key Features
- Genuine Cummins OEM camshaft bushing (PN 3901306).
- Front position cam bushing for early B-Series 4B/6B engines up to ~5/1997.
- Engineered oil feed and bearing geometry for stable cam timing and long life.
- Direct-fit for 1989–1997 Dodge Ram 5.9L 12V (6BT) – no machining required when bores are in spec.
- Ideal any time the cam is out: rebuilds, cam upgrades, or fixing oil-pressure issues at the front journal.
Fitment
Automotive – Dodge Ram
- 1989–1993 Dodge Ram 2500/3500 – 5.9L 12V Cummins (6BT) – front cam bushing.
- 1994–1997 Dodge Ram 2500/3500 – 5.9L 12V Cummins (6BT) – front cam bushing.
Industrial / Off-Highway (B-Series)
- Cummins 4B / 4BT / 4B3.9 – early B-Series front cam bushing (verify by ESN).
- Cummins 6B / 6BT / B5.9 – early B-Series front cam bushing (approximately through 5/1997 – verify by ESN).
Compatibility notes: 3901306 covers early “non-STORM” B-Series blocks through roughly May 1997 in the front position. For later STORM-block and common-rail engines, use the thicker Cummins 3940059 bushing instead.
When To Choose 3901306 vs. 3940059
- Use 3901306 on early 5.9L 12V trucks (1989–1997) and matching B-Series industrial engines where the block is machined for the thin front bushing.
- Use 3940059 on late 12V, 24V VP44, and 6.7L ISB “STORM block” engines that require the thicker front bushing.
Cross-Reference & Related Cummins Parts (CPP Internal Links)
- CUMMINS 3929028 OEM CAMSHAFT GEAR – RAM 5.9L 12V (1989–2000) – OE cam gear that mates to the 3901306-supported cam.
- CUMMINS 3902332 OEM CAMSHAFT KEY (PLAIN WOODRUFF) – RAM 5.9L/6.7L (1989–2021) – locks cam gear to the camshaft; replace any time the gear is off.
- CUMMINS 3927155 OEM CAMSHAFT THRUST PLATE / RETAINER – RAM 5.9L (1989–2002) – controls cam end-play; recommended with a new cam bushing.
- CUMMINS 3940059 OEM CAMSHAFT BUSHING (THICK) – 5.9L/6.7L ISB (1997.5–2018) – thicker OE cam bushing for STORM-block / later engines.
- CUMMINS 3900687 OEM REAR CAM EXPANSION PLUG – 5.9L 12V/24V (1989–2002) – rear cam plug; a smart add-on when the cam is out.
What’s Included
- (1) Genuine Cummins camshaft bushing – front position (PN 3901306).
Installation Notes
- Clean the cam bore and inspect for scoring, taper, or out-of-round before installation.
- Align the lubrication feed hole in the bushing with the oil passage in the block.
- Use the correct driver/installer to press the bushing squarely – avoid makeshift tools that can distort the bore.
- After install, verify camshaft end-play and thrust plate torque to factory spec and rotate the cam by hand to confirm smooth movement.
Specifications for cummins 3901306
| Brand | Cummins Genuine Parts |
|---|---|
| Cummins Part Number | 3901306 |
| Type | Camshaft bushing – front position |
| Engine Family | Cummins B-Series 4B/4BT/6B/6BT, 5.9L 12V (non-STORM block) |
| Primary Automotive Fitment | 1989–1997 Dodge Ram 2500/3500 with 5.9L 12V Cummins (6BT) |
| Outside Diameter | Approx. 2.25" front journal (early B-Series – reference only) |
| Quantity Required | 1 front cam bushing per engine (remaining journals ride directly in the block) |
| UPC | Not published by Cummins (service part typically sold without retail UPC) |
| GTIN | Not published for Cummins 3901306. Aftermarket cross-reference GTINs include 698231135662 (World American WA902-17-6610) and 00193807014568 (PAI 151508), which interchange with 3901306. |
| Cross Reference | Cummins: 3901306, CUM3901306 Mahle/Clevite: SH-1404, SH1404 Interstate-McBee: M-3901306, M3901306 Other interchange: J901306, K3901306, FP-3901306, WA902-17-6610, PAI 151508 (verify dimensions and application before substituting). |
| Shipping Info | Ships from CPP Diesel via standard ground. Small-parcel item; typical shipping weight ~0.2 lb. Shipping cost calculated at checkout. |
| E-Codes | Not applicable – internal engine component (no lighting or emissions E-code). |
| Prop 65 | Not specifically listed by Cummins. As with any metal engine component, avoid prolonged skin contact with used engine oil and wear standard shop PPE. For general information, see www.P65Warnings.ca.gov . |
FAQ
WILL THIS FIT MY 1989–1997 5.9L 12-VALVE CUMMINS?
Yes. Cummins 3901306 is the OE front camshaft bushing used on early 5.9L 12V B-Series engines (Dodge Ram 2500/3500) through roughly mid-1997. Always confirm by engine serial number (ESN) if you are near the changeover.
HOW MANY CAM BUSHINGS DOES MY 5.9L 12V USE?
These engines use a single serviceable front cam bushing. The remaining cam journals run directly in the block. When rebuilding, it’s common to replace the front bushing along with the camshaft, gear, key, and thrust plate.
WHAT’S THE DIFFERENCE BETWEEN 3901306 AND 3940059?
3901306 is the thin front cam bushing used in early, non-STORM B-Series blocks. 3940059 is a thicker front cam bushing used on late 12V (1997.5-up), 24V VP44, and many 5.9L/6.7L ISB STORM-block engines. If your block is machined for the thicker bushing, use CUMMINS 3940059 instead of 3901306.
DO I NEED ANY OTHER PARTS WHEN REPLACING THIS BUSHING?
It’s strongly recommended to inspect and often replace related parts at the same time, including the cam gear, cam key, thrust plate, and rear cam plug: CUMMINS 3929028 cam gear , CUMMINS 3902332 cam key , CUMMINS 3927155 thrust plate , and CUMMINS 3900687 rear cam plug .
DO I NEED SPECIAL TOOLS TO INSTALL THIS CAMSHAFT BUSHING?
A proper cam bushing driver/installer is highly recommended. It keeps the bushing square in the bore and helps you align the oil feed hole correctly. Improvised tools (sockets, pipes, etc.) can distort the bushing and cause premature wear or oiling problems.
IS THIS A GENUINE CUMMINS PART OR AFTERMARKET?
This listing is for an OE Cummins camshaft bushing, part number 3901306 – sourced through CPP Diesel as a genuine Cummins service part. If you prefer a cost-effective aftermarket alternative, see the Interstate-McBee M-3901306 cam bushing in our camshaft category.
