Cummins 4B 3.9L, 6B 5.9L, 4B 4.5L Inframe Engine Rebuild Kit, New (IF3957799)

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.

• Upgrade your engine with an Inframe Rebuild Kit that’s manufactured and assembled in an ISO 9001:2008 certified facility. Simply put, its the quality and consistency needed to extend the life of your engine.
• These aren’t your grandpa’s gaskets! We ensure gaskets are made with all the correct materials to ensure they have superior performance in functionality and sealability.
• Think your tough? Rod and main rod bearings are constructed with tri-metal components for long lasting durability. That’s tougher than your average Joe!
• At 4BTdiesel, we know you don’t have money to burn. Good news! For a much lower price, you will still receive equal or better compared to the OEM!
• Thought we were done? 4BTdiesel will help save you additional money! All components of your Inframe Rebuild Kit are brand new, so there’s no core charge! You can’t beat it!
• Go the extra mile, or a million extra miles with CNC turned pistons and computer controlled piston machining to maintain proper clearances within your cylinders.
• To add even more oomph to your pistons, pins are hardened and tempered for improved strength and wear resistance. 
• Why sacrifice quality if you don’t have to?  Keep oil in it’s place with oil control rings designed with precise tangential tensionto give your engine the proper oil control it requires.
• Make your diesel great again! We include USA made sealing products made with 100% asbestos-free materials!
• You’ll get back up and running in no time. Be assured your Inframe Rebuild Kit is built to OEM specifications ensuring proper fit and function within your engine.

Kit Contents:

• (6) .50mm Piston Kits
• (12) Piston Pin Retainers
• (6) Piston Pins
• (6) .50mm Engine Pistons
• (6) .50mm Piston Ring Sets
• (6) Oil Piston Rings
• (6) Compression Piston Rings
• (6) Compression Piston Rings
• (1) Main Bearing
• (6) Connecting Rod Bearings
• (6) Connecting Rod Bearings
• (1) Gasket
• (1) Oil Pan Gasket
• (1) Upper Engine Gasket Set
• (6) Rocker Cover Bolt Seals
• (1) Metal Gasket
• (2) Washers
• (6) Injector Sleeves
• (6) Injector Seals
• (1) Thermostat Seal
• (6) Injector Seals
• (6) Valve Cover Gaskets
• (6) Noise Isolators
• (1) Rectangular Ring Seal
• (1) Cylinder Head Gauge
• (6) Mid Range XPI Injector Seals
• (1) Turbo Oil Drain Gasket
• (1) Intake Manifold Gasket
• (2) Gaskets
• (2) Sealing Washers
• (6) Exhaust Manifold Gaskets
• (12) Valve Stem Seals
• (1) O-Ring Seal
• (1) Cylinder Head Gasket
• (6) Washers
• (1) Gasket
• (1) Sealing Washer
• (6) Banjo Seals
• (1) Rectangular Ring Seal
• (1) Washer

Warranty

6-month warranty.

What Rebuild Kit and Gasket Set Includes