Cummins 4B 3.9L, 4B 4.5L Inframe Engine Rebuild Kit, New (IF4089977RGT4B)

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.

• Is your engine on the fritz? Trust the experts with a rebuild that restores your engine to optimal working condition and keeps it running for another million or more miles.
• Let’s make your engine tougher than your average Joe. Tri-metal connecting rods and main bearings are included to fortify your engine against the most extreme conditions. Plus, hardened and tempered piston pins are included to improve strength and wear resistance.
• We put the OE to shame with unsurpassed quality and consistency. This rebuild kit goes through a strict manufacturing and assembling process at an ISO 9001:2008 certified facility. We emphasize quality here at 4BTdiesel and this kit will deliver the highest satisfaction.
• Plus, our quality meets or exceeds the OE’s at a much lower price, keeping you and your wallet full. But, the fact that all new parts are included and there is no core charge is sweeter than your Grandma’s apple pie.
• Let’s talk Pistons. You’ll sleep soundly knowing the pistons included are CNC turned to precise tolerances, and are computer control machined to proper clearances. It doesn’t get much better than that!
• Power and efficiency will be your middle name with these pistons. They utilize complex combustion bowl geometry to give you increased power and efficiency. 
• Leakage? Never heard of it. The sealing products within this kit are proudly USA made and use 100% Asbestos-Free material. Additionally, the correct materials are used in the crafting of the gaskets ensuring top-notch performance in functionality and sealability.
• You’ll get back up and running in no time since all parts are built to OEM specifications, giving you the best of fit and function. An added bonus, you may make it back on time for dinner with the kids.

Kit Contents

• (4) 1.00mm Piston Kits
• (8) Piston Pin Retainers
• (4) Piston Pins
• (4) 1.00mm Engine Pistons
• (4) 1.00mm Piston Ring Sets
• (4) Top Piston Rings
• (4) 1.00mm Second Piston Rings
• (4) 1.00mm Oil Rings
• (1) Main Bearing Set
• (4) Top Main Bearings
• (5) Bottom Main Bearings
• (1) Thrust Bearing
• (1) Lower Thrust Bearing
• (6) Connecting Rod Bearings
• (6) 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