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Cummins 4B, 4BT, 4BTA 3.9L, Case 4-390, 4T-390, 4TA-390 Reman Long Block

Cummins 4B, 4BT, 3.9L, Case 4-390, 4T-390 Reman Long Block

Name: Cummins 4B, 4BT, 3.9L, Case 4-390, 4T-390 Reman Long Block
SKU: RP1334RN
Price: 4750 USD
Availability: InStock

SKU: RP1334RN

^$4,750⁰⁰

+$750.00 Core Charge*

*Original Engine Serial No.
*Equipment Make/Model

* Required Fields

In Stock (99+)

Qty:

Condition: Remanufactured

Cross-References: 1172, 1173, 1201, 1202, 1259, 1260, 1268, 1277, 1278, 1287, 1312, 1508, 1509, 1520, 1521, 1525, 1526, 1631, 1659, 1839, 1932, 1940, 1941, 1963, 1965, 1966, 1967, 2001, 2021, 2064, 2109, 2142, 2144, 2148, 2149, 2195, 2246, 2248, 2264, 2293, 2302, 2304, 2340, 2351, 2359, 2361, 2374, 2377, 2396, 2414, 2456, 2457, 2478, 2486, 2487, 2489, 2490, 2528, 2566, 2567, 2568, 2599, 2600, 2601, 2623, 2672, 2673, 2675, 2808, 2857, 2881, 591, 592, 593, 594, 595, 646, 681, 690, 696, 710, 711, 721, 725, 727, 730, 741, 762, 763, 767, 817, 8239, 826, 8275, 843, 8534, 857, 858, 8711, CM4BEL-RLEN, CPLs 1522, FO073-87790253-RE

Original Equipment Quality

Parts that meet or exceed OEM specifications. Guaranteed performance you can trust. Reliability built into every component.

100+ Years of Expertise

A century of collective diesel knowledge and 10+ acres of engines and engine parts, we are more than just an online reseller or call center. We know heavy-duty diesel.

Here for the Long Haul

Same location and same phone number for the last 50 years. Same commitment to getting you the right parts at the right price.

New, Reman, & Used

RF Engine offers an expansive offering of new aftermarket, remanufactured, and used engines and engine parts all under one roof.

Details

Remanufactured replacement long block.

Includes rotation assembly (block, crank, rods, & pistons), cylinder head with rocker arm assemblies & valve covers, camshaft with lifters & pushrods, oil pump, oil pick-up tube, oil pan, water pump, front gear housing, and tin.

Installer re-uses injection pump gear and fuel system, starter, alternator, flywheel, intake and exhaust manifolds, turbocharger (where applicable), hydraulic or accessory drive pump, and all other external components.

This does NOT have the "STORM" or "STRESS" style cylinder block. On this model the cylinder block casting has slightly thinner webbing for lower horsepower applications and there is a large freeze/expansion plug next to the oil filter head rather than a cast embossment with threaded port. From our experience, and after hundreds of long block sales, this earlier block is interchangeable with the STORM / STRESS blocks without consequence in lower and mid-range horsepower applications.

Fitment Guide

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Warranty Information

Cummins B Series Long Block Warranty

Your new Cummins B Series long block comes with a 6-month warranty covering defects in materials and workmanship. We're committed to ensuring you receive a quality product that performs as expected.

What's Covered

Coverage Period: 6 months from date of purchase
Parts Protection: Replacement parts for any component of the long block itself found to be defective in materials or workmanship
Our Promise: If a covered defect occurs, we'll provide replacement parts at no charge to get you back up and running

What's Not Covered

This warranty covers replacement parts only. The following costs are the customer's responsibility:

Labor: Installation, removal, diagnosis, or any other labor costs
Fluids & Consumables: Engine oil, coolant, filters, gaskets, or any other consumables
Shipping: Both inbound shipping of defective parts and outbound shipping of replacement parts
Incidental Expenses: Towing, equipment rental, downtime, or any other indirect costs

How It Works

If you experience an issue covered under warranty:

Contact us immediately with your order number and description of the problem
We'll work with you to diagnose the issue and determine if it's warranty-related
For valid claims, we'll ship replacement parts as quickly as possible
Defective parts must be returned for inspection (return shipping at customer's expense)

Important Notes

Professional Installation Required: We strongly recommend installation by a qualified diesel technician to ensure proper break-in and operation
Keep Your Records: Retain your invoice and any service records — you'll need them for warranty claims
Questions?: We're here to help. If you're unsure about coverage or need assistance, please contact us

This warranty gives you specific legal rights, and you may have other rights which vary from state to state.

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All specifications and numbers are provided for reference only and should be independently verified before use. While we guarantee our parts match their descriptions and accept returns for any discrepancies, we cannot be held liable for installation costs, modifications, or consequential damages. Questions about compatibility? Contact our parts experts at 800-828-6943, sales@dieselcranks.com, or via live chat, Mon-Fri 8am-5pm EST.

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