Cummins 4B 3.9L, 6B 5.9L, 4B 4.5L Inframe Engine Rebuild Kit, New (IF3957797)

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.

• Restore and extend the life of your diesel with an all new Inframe Rebuild Kit that’s built to OEM specifications! Thus, ensuring all components fit and work properly within your engine.
• Put the OEM to shame! All pieces of your rebuild kit will be of equal or better quality compared to the OE all for a much lower price and no core charge!
• Wear and tear? You won’t have to worry about that. Piston pins are hardened and tempered for improved strength and wear resistance to get you another million miles!
• Maximize the power within your cylinders with CNC turned pistons. These pistons are machined by computer controls to maintain the proper clearances.
• Keep your engine sturdy over time with rod and main bearings constructed with tri-metal elements for long lasting strength and durability.
• Here at 4BTdiesel, quality matters. To ensure quality and consistency for your rebuild kit,all kits are manufactured and assembled in an ISO 9001:2008 certified facility. 
• Keep oil where it needs to be with oil control rings designed with precise tangential tension for proper oil control.
• Keep your diesel running great with USA made sealing products from 100% asbestos-free material.
• Drive confident knowing gasket were made with the correct materials to have top-notch performance in sealability and functionality. 
• Get back up and running quicker! Your overhaul kit is packaged in sub-assemblies for an easy installation!

Kit Contents:

• (6) Piston Kits
• (6) Piston Pins
• (6) Engine Pistons
• (16) Piston Pin Retainers
• (6) 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