Cummins 6B, 6BT, 6BTA 5.9L, Case 6-590, 6T-590, 6TA-590 New Long Block Kit
Details
Assembly required. New-aftermarket replacement long block.
Includes all parts for 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.
Our aftermarket replacement parts are built to OEM-equivalent standards. They have been produced to meet or exceed original equipment specifications for material quality, dimensional tolerance, and field durability — the same rigors the factory part is designed to handle. The result is a component that installs like factory, performs like factory, and delivers long service life without the dealer price tag.
Fitment Guide
Warranty Information
Reliance Power Parts Warranty Policy
The Reliance Power Parts (RPP) warranty policy covers parts and labor necessary to repair a warrantable failure to the functional condition of the application that existed immediately prior to the failure, as detailed below. This warranty applies to direct customers of RPP only and is non-transferable.
Coverage Periods
- New Internal Engine Parts (Ag/Industrial): 1 year from invoice date, unlimited miles/hours
- Engine Overhaul Kits (Heavy-Duty On-Highway): 2 years from invoice date, unlimited miles/hours
- New Engine Accessories: 1 year from invoice date, parts replacement only
- Remanufactured Engine Accessories: 6 months from invoice date, parts replacement only
- Remanufactured Engine & Drivetrain Parts: 6 months from invoice date, parts replacement only
- Drivetrain Parts: 1 year from invoice date, parts replacement only
- Complete Engines, New Long Blocks & New Short Blocks (Reliance Manufactured): 6 months from invoice date, parts replacement only
- Remanufactured Long Blocks & Short Blocks (Reliance Manufactured): 90 days from invoice date, parts replacement only
Engine accessories include turbochargers, fuel injectors, hydraulic pumps, engine oil pumps, oil coolers, water pumps, and electrical components.
Manufacturer's Warranty Items
To serve a wider application base, RPP offers lower volume, rare application, and remanufactured parts from a variety of manufacturers. These parts will be noted on your invoice as subject to a "Manufacturer's Warranty" policy and are not covered under this policy. Engines, long blocks, medium blocks, and short blocks produced by any company other than Reliance are solely covered by the manufacturer's warranty. Contact your Reliance representative for details.
Parts & Labor Coverage
- Parts: Covered at current customer pricing using new or remanufactured RPP approved parts
- OEM/Outside Parts: When RPP parts are available, OEM parts will be credited at RPP pricing. Parts not available from RPP will be covered at billed rate with invoice required
- Labor: Offered at RPP's discretion, not to exceed published flat-rate times and maximum regional wholesale hourly labor rate
- Holiday/Overtime Rates: Not covered
What's Not Covered
This warranty does not cover failures resulting from:
- Owner or operator abuse or neglect
- Operation without adequate coolant, fuel, or lubricants
- Over-fueling or over-speeding
- Lack of maintenance of lubricating, coolant, or air intake systems
- Improper storage, starting, warm-up, run-in, or shut-down practices
Coverage does not include:
- Troubleshooting or diagnostic time
- Towing, transport, or down-time
- Rental fees or incidentals
- Delivery charges, travel, meals, or lodging
- Business losses, docking, or harbor charges
Responsibilities
- Installer: Ensure parts are correct for the application and install according to OEM procedures, specifications, and accepted industry standards
- Owner: Operate and maintain equipment as specified in OEM operation and maintenance manuals
How to File a Claim
- RPP must be notified prior to the end of the warranty period
- All warranty repairs must be authorized by RPP technical staff
- Request a Warranty Claim Form for the return of parts
- Return all claimed parts to the indicated location within 30 days of receiving a Return Merchandise Authorization
- Include failed parts, completed Warranty Claim Form, and copies of related work orders or invoices
- Ship parts freight pre-paid in a condition that makes examination possible
- Parts received without a Warranty Claim Form will be returned freight collect
Important Notes
- Professional Installation Required: We strongly recommend installation by a qualified technician to ensure proper break-in and operation
- Keep Your Records: Retain your invoice and service records for warranty claims
- Questions?: If you're unsure about coverage or need assistance, please contact us
The warranties set forth herein are the sole warranties made by RPP regarding its parts. RPP makes no other warranties, expressed or implied, of merchantability or fitness for a particular purpose.
Crankshaft Gear for Cummins 3929027
SKU: K3929027
$63.88
Valve Lifter for Cummins 3931623
SKU: K3931623
$7.26
New Loaded Cylinder Head for Cummins 3934747, 3917287
SKU: K3917287V
$1,124.00
Camshaft for Cummins, Case 3929042
SKU: K3929042
$176.42
Camshaft Bushing (Original Block) for Cummins, Case 3901306
SKU: K3901306
$5.08
Expansion Plug (2.288" / 58mm) for Cummins 3922072
SKU: K3922072
$4.29
Camshaft Gear for Cummins 3907431
SKU: K3907431
$121.17
Oil Pump for Cummins, Case 3937404
SKU: K3937404
$95.62
Cylinder Head Gasket Set for Cummins, Case 3804897
SKU: K3804897
$123.78
Conversion Gasket Set for Cummins, Case, Komatsu 3802376
SKU: K3802376
$134.47
Cummins 4B, 6B, Case 4-390, 6-590 New Pushrod | Replaces 3904679, J923262
SKU: K3904679
$9.24
Connecting Rod (New Fracture-Split) for Cummins 4943979
SKU: K4943979
$141.83
Oil Cooler for Cummins, Case 3957544
SKU: K3957544
$108.37
Main Bearing Set (STD) for Cummins, Case, Komatsu 3802070
SKU: K3802070
$59.61
Cummins 4B, 6B Valve Cover New 3929412
SKU: K3960372
$25.15
Cummins 4B, 6B Grommet Seal Copper Washer New 3928759
SKU: K3928759
$3.04
Camshaft Bolt for Cummins 3900227
SKU: K3900227
$5.77
Camshaft for Cummins 3902332
SKU: K3902332
$3.02
Camshaft Thrust Plate for Cummins, Case 3927155
SKU: K3927155
$12.20
Cummins 4B, 6B, 6C Oil Drain Plug New 3902424
SKU: K3904386
$8.58
Cummins 6C Pipe Plug New 3008468
SKU: K3008468
$2.05
Expansion Plug (Rear) for Cummins 3900687
SKU: K3900687
$2.75
Water Pump for Cummins, Case 3286277
SKU: K3286277
$78.25
Cylinder Block for Cummins 3905806
SKU: K3905806
$1,965.00
Cylinder Head Dowel Ring for Cummins 3902343
SKU: K3902343
$1.75
Engine Lifting Bracket-front
SKU: K3903757
$74.25
Engine Lifting Bracket Cummins 4B3.9L 6B5.9L
SKU: K3908118
$18.85
Thermostat for Allis Chalmers 3917324
SKU: K3917324
$46.52
Connecting Rod Bearing (STD) for Cummins 3969562
SKU: RP231163
$15.72
Cummins 4B 3.9L, 6B 5.9L New Oil Filter Head Seat | Replaces 3913967, 3918288
SKU: K3913967
$89.95
Camshaft Plug Seal for Cummins 3926047
SKU: K3926047
$1.57
Cummins Crankcase Breather Hose
SKU: K3918614
$25.91
Crankshaft Gear for Cummins 3904483
SKU: K3904483
$8.34
Cummins Dowel Pin
SKU: K3900257
$24.31
Flywheel Housing for Cummins 3900068
SKU: K3900068
$3.38
Cylinder Head Bolt for Cummins 3920779
SKU: K3920779
$3.56
Cylinder Head Bolt for Cummins 3920780
SKU: K3920780
$4.75
Cylinder Head Bolt for Cummins 3920781
SKU: K3920781
$5.59
Oil Pan Drain Plug for Cummins 3924147
SKU: K3924147
$12.13
Cummins Pipe Plug
SKU: K3906619
$0.48
Push Rod Cover for Cummins 3990730
SKU: K3990730
$81.22
Push Rod Cover Bolt for Cummins 3900629
SKU: K3900629
$1.34
Rear Crankshaft Seal for Cummins 3936904
SKU: K3936904
$65.29
Rear Crankshaft Seal for Cummins 3991306
SKU: K3991306
$0.75
Rocker Arm Assembly for Cummins 3910815
SKU: K3910815
$84.43
Rocker Arm Assembly Bolt for Cummins 3901221
SKU: K3901221
$1.67
Thermostat Housing Bolt for Cummins 3903096
SKU: K3903096
$2.09
Cummins Timing Gear Housing Bolt
SKU: K3900633
$1.37
Cummins Valve Cover
SKU: K3960373
$26.87
Valve Cover Bolt for Cummins 3960357
SKU: K3960357
$2.91
Valve Spring for Cummins 3926700
SKU: K3926700
$4.99
Select your make and model below to verify whether this part fits your application.
Found the same part somewhere else for less? Send us the link and we'll beat that price by 5%. We've been doing this since 1975, and we'd rather earn your business than lose it over a few dollars.
Some restrictions apply, see Terms & Conditions for details.