Cummins 4B 3.9L, 4B 4.5L Inframe Engine Rebuild Kit, New (IF4089976RGT4B)

Think you know the truth about Aftermarket Rebuild Kits? We’d bet you’d be surprised.
It’s no secret, rebuilding your rig is one of the most labor (and wallet) intensive repairs out there. Sure, you want your engine to last another million miles but you also want the best price; so what should you choose- OEM or Aftermarket? 

When it comes to engine parts, the aftermarket often gets a bad rep. The idea that aftermarket retailers sell cheap parts with zero warranty, delivered in a beat-up box written in another language couldn’t be further from the truth. 4BTdiesel is here to set the record straight; we only sell Rebuild Kits with new parts, zero core charges, and a 6-month warranty. On top of only offering premium quality parts, we also make sure you save up to 50% off OEM prices. So, when it comes to your rebuild, what’s left to want? 

Need a little extra proof? Let’s talk Rebuild Kits.

• Want to extend the life of your engine and restore it togood working condition? Getting a brand new rebuild kit will not only do that but also make your engine great again. Plus, you’ll get proper fit and functionality with all parts being crafted to strict OE specifications.
• Keeping your rig up and running is a high priority. That is why the rod and main bearings included are made of a tri-metal material for increased durability that you can count on. 
• Go the extra mile, or a million extra miles with piston pins that are hardened and tempered for improved strength and wear resistance. These bad boys are tougher than your average Joe. 
• Why sacrifice quality? You’ll get equal or better quality compared to the OE at a much lower price. Don’t overpay when you can get better quality for less!
• Adding to the savings, all new parts are included and there is no core charge. You can’t beat that! 
• Trust the experts here at 4BTdiesel with a Rebuild Kit manufactured and assembled in an ISO 9001:2008 certified facility. Ensures top-notch quality and consistency that you can trust. 
• You’ll feel at ease knowing the pistons included are CNC turned to precise tolerances. Additionally, computer controlled piston machining is used to maintain proper clearances, giving you peace of mind when out on the road.
• Keep oil where it needs to be with Oil Control Rings designed with precise tangential tension for maximum oil control. Adding onto that, the sealing products included are proudly USA made and are composed of 100% Asbestos-Free Material. Your engine will be a well oiled machine!
• Let’s seal the deal. The gaskets included are used with proper materials for maximum sealing performance, keeping your fluids where they need to be. It simply doesn’t get better than that!

Kit Contents

• (4) .50mm Piston Kits
• (8) Piston Pin Retainers
• (4) Piston Pins
• (4) .50mm Engine Pistons
• (4) .50mm Piston Ring Sets
• (4) Top Piston Rings
• (4) .050 Second Piston Rings
• (4) Oil Rings
• (1) Main Bearing Set
• (4) Top Main Bearings
• (5) Bottom Main Bearings
• (1) Thrust Bearing
• (1) Lower Thrust Bearing
• (4) Connecting Rod Bearings
• (4) Connecting Rod Bearings
• (1) Oil Pan Gasket
• (1) Oil Suction Connection Gasket
• (1) Upper Engine Gasket Set
• (4) O-Ring Seals
• (4) Exhaust Manifold Gaskets
• (1) Cylinder Head Gasket
• (1) Cylinder Head Gasket
• (1) O-Ring Seal
• (2) O-Ring Seals
• (1) Rectangular Ring Seal
• (2) Turbo Hose O-Ring Seals
• (2) O-Ring Seals
• (1) Turbocharger Gasket
• (1) Thermostat O-Ring Seal
• (2) Sealing Washers
• (4) O-Ring Seals
• (4) O-Ring Seals
• (1) Turbo Oil Drain Gasket
• (4) Sealing Washers
• (12) O-Ring Seals
• (2) Sealing Washers
• (1) Rocker Lever Housing Gasket
• (4) Noise Isolators
• (1) Ring Seal
• (1) Filler Cap Gasket
• (1) O-Ring Seal
• (1) O-Ring Seal
• (1) Valve Cover Gasket
• (4) Plain (Copper) Washers

Warranty

6-month warranty.

What Rebuild Kit and Gasket Set Includes