Cummins 4B 3.9L, 6B 5.9L, 4B 4.5L Inframe Engine Rebuild Kit, New (IF4089950Q)

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.

• Get quality you can trust with a brand new rebuild kit manufactured and assembled in an ISO 9001: 2008 certified facility.
• Go a million more miles with a kit that includes a graded multi-layer steel cylinder head gasket and is also made with long lasting strength and durability.
• Additionally, this kit includes CNC turned pistons to precise tolerances and gaskets made with leak free durability!
• For improved strength and wear resistance our piston pins are hardened and tempered.
• To top it off, the pistons utilize complex combustion bowl geometry which also rely on gallery cooled piston technology.
• With this rebuild kit you are not only getting brand new parts with no core charge, you are also getting parts that are built to OEM specifications with equal or better quality compared to the OE at a muchlower price.  Which  means, better performance under the hood & more coin in your pocket!
• If you think you’re tough, you should see these connecting rods and main bearings crafted with tri-metal for durability.
• Since our gaskets are made with the correct materials, you will be getting excellent performance and leak free seal ability. 
• Our sealing products are proudly made in the USA and use 100% asbestos-free material.  I think that speaks for itself.
• Simply put, a rebuild kit will restore your engine to good working condition and extend the life of it.

Kit Contents:

• (6) Piston Kits
• (12) Piston Pin Retainers
• (6) Piston Pins
• (6) Engine Pistons
• (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) Oil Pan Gasket
• (1) Flange Gasket
• (1) Upper Engine Gasket Set
• (1) O-Ring Seal
• (1) O-Ring Seal
• (6) Mid Range XPI Injector Seals
• (6) Gaskets
• (1) Intake Cover Manifold Gasket
• (1) Rocker Cover Gasket
• (1) Thermostat Seal
• (12) Valve Stem Seals
• (1) O-Ring Seal
• (1) O-Ring Seal
• (2) O-Ring Seals
• (1) Rocker Cover Housing Gasket
• (8) Sealing Washers
• (3) Sealing Washers
• (2) Sealing Washers
• (2) Gaskets
• (6) O-Ring Seals
• (6) O-Ring Seals
• (1) Oil Drain Gasket
• (1) O-Ring Seal
• (1) Cylinder Head Gasket
• (1) O-Ring Seal
• (2) O-Ring Seals
• (1) O-Ring Seal
• (2) O-Ring Seals
• (1) Turbocharger Gasket
• (1) Exhaust Connection Gasket
• (6) Turbo Hose O-Ring Seal

Warranty

6-month warranty.

What Rebuild Kit and Gasket Set Includes