Cummins 3904166 — Genuine Cylinder Repair Sleeve (Salvage Sleeve) for 5.9L B-Series

MPN: 3904166  |  Also Known As: salvage sleeve, cylinder liner repair sleeve (straight, non-flanged)  |  Application: B-Series 3.9L/5.9L service repair

Genuine Cummins cylinder repair sleeve designed to restore worn or damaged bores to standard size on B-Series engines. Ideal when an oversize rebore won’t clean up the cylinder. Automotive coverage: 1989–2007 Ram 5.9L (12V, VP44 24V, and common-rail). Sold individually (order one per affected cylinder).

Features & Benefits

• OE salvage solution to return a damaged cylinder to standard size and compression.
• Straight, non-flanged sleeve for machine-shop installation and finish-hone to spec.
• Protects performance by reducing blow-by, oil consumption, and hot-spotting from scored walls.
• Engineered by Cummins for correct material hardness and wall integrity.
• Cost-effective block save when compared with replacement or sleeving all six.

Verified Fitment (Automotive)

Industrial/Off-Highway: B3.9/4B3.9 and B5.9/6B5.9 families; also listed for ISB/QSB 5.9 variants — verify by ESN for non-automotive use.

Specifications

• Type: Straight (non-flanged) cylinder repair sleeve / salvage sleeve
• OE Part Number: 3904166
• Engine Families: 4B3.9 / 6B5.9 (ISB/QSB 5.9)
• Quantity Required: 1 per repaired cylinder (sold individually)
• Bore Family: 5.9L B-Series standard bore (102 mm)

Often Paired With

• Pistons & ring sets matched to final bore
• Head gasket set (recommended during top-end reassembly)
• Coolant & oil refresh after machining and cleaning

What’s In The Box

• (1) Genuine Cummins Cylinder Repair Sleeve (3904166)

Installation Tips

• Measure wear and out-of-round; confirm oversize rebore won’t clean up before choosing a salvage sleeve.
• Follow Cummins/machine-shop procedures for sleeve interference fit, adhesive/sealant (if specified), and deck integrity.
• Final hone to target piston-to-wall clearance; verify ring end-gaps.
• Thoroughly clean block oil/coolant passages before reassembly.

FAQ

WILL THIS FIT MY 5.9L CUMMINS RAM (1989–2007)?

Yes—3904166 is used to repair cylinders on 5.9L B-Series/ISB engines across 1989–2007 Ram applications. Confirm by ESN and machine-shop assessment.

IS THIS THE RIGHT SLEEVE FOR A 6.7L CUMMINS?

No. The 6.7L uses a larger 107 mm bore; 3904166 targets 5.9L (102 mm bore) engines.

IS IT FLANGED OR STRAIGHT?

Straight (non-flanged) salvage sleeve—installed with an interference fit and finish-honed to spec.

DO I NEED A MACHINE SHOP?

Yes. Proper boring, pressing, and final honing are required for service life and sealing.

WHEN SHOULD I CHOOSE A SALVAGE SLEEVE?

Use a salvage sleeve when a standard oversize rebore (e.g., +0.040") won’t remove scoring/taper, or to save a block with localized damage.