Cummins 3930906 — Genuine Valve Cover Gasket for B-Series (Individual Covers)

MPN: 3930906  |  Also Known As: valve/rocker cover gasket  |  Supersedes / Cross-Ref (ID): 3902666

Seal up those classic B-series valve covers. The genuine Cummins 3930906 valve cover gasket replaces leaking seals on 1989–1998 Ram 2500/3500 5.9L 12-valve engines with individual valve covers. Sold individually; 6 required to reseal all covers on a 6BT. OE dimensions for a clean, leak-free install.

Features & Benefits

• OE sealing profile stops seepage at the cover-to-head interface.
• Direct-fit for VE (’89–’93) and P7100 (’94–’98) 12-valve applications.
• Correct fit on B-series individual covers (no trimming or RTV blobs).
• Durable OE materials stand up to heat, oil, and vibration.
• Genuine Cummins part for reliable, repeatable service.

Verified Fitment (Automotive)

Industrial/Off-Highway: Common on 4BT 3.9L and 6BT 5.9L B-series engines with individual valve covers; verify by ESN for non-automotive usage.

Specifications

• Type: Valve (rocker) cover gasket
• OE Part Number: 3930906
• Supersedes: 3902666
• Quantity Required: 6 per 6BT engine (sold individually)

Often Paired With

• Valve cover bolts: 3907049 (’89–’98)
• Bolt O-ring/washer: 3910824 (’89–’98)
• Fresh engine oil & filter: if contamination is present

What’s In The Box

• (1) Genuine Cummins Valve Cover Gasket (3930906)

Installation Tips

• Work one cover at a time to keep debris out. Clean both sealing surfaces thoroughly.
• Align gasket to cover channel; avoid over-torquing to prevent distortion.
• If bolts use sealing washers/O-rings, replace them to prevent weeping at fasteners.
• Warm up and re-check for seepage after the first heat cycle.

FAQ

WILL THIS FIT MY 1989–1998 12-VALVE RAM?

Yes—3930906 is the OE valve cover gasket for ’89–’98 5.9L 12-valve trucks with individual covers.

HOW MANY GASKETS DO I NEED?

Six gaskets are required to reseal all six valve covers on a 6BT. Sold individually.

DOES THIS REPLACE 3902666?

Yes—3930906 supersedes legacy part number 3902666.

DOES THIS WORK ON 4BT ENGINES?

Yes—fits many 3.9L 4BT applications with individual valve covers. Verify by ESN for industrial engines.

WHAT HARDWARE SHOULD I REPLACE?

Inspect/replace valve cover bolts (3907049) and the bolt O-ring/gasket (3910824) to prevent weeping at the fasteners.