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Side Banner Advantage12/3/2013 12:00 AM

Cummins ISX, QSX Inframe-Overhaul Engine Rebuild Kit



Kit Type:

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CPL Number*
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Engine Serial Number*
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Rod Bearing Sizes*
Main Bearing Sizes*
Cummins ISX, QSX Inframe-Overhaul Engine Rebuild Kit

Parts Included In Engine Inframe Kit:
(6) Piston Kits (One Piece (see below), Rings, Wrist Pin, Pin Locks)
(6) Liner Kits (Liner with O-rings)
(1) Upper Gasket Set
(1) Oil Pan Gasket
(1) Pick Up Tube O-Ring
(6) Rod Bearings
(1) Main Bearing Set
(1) Bypass Valve, Plunger

*Agkits.com recommends adding the camshaft bearings to the rebuild kit. These bearings are almost always worn when it comes time to rebuild. Each set includes (4) 3680580 (3) 3680581 & (7) 4026423. View this products related products tab to add them.

Parts Included In Engine Overhaul Kit:
(6) Piston Kits (One Piece (see below), Rings, Wrist Pin, Pin Locks)
(6) Liner Kits (Liner with O-rings)
(1) Full Gasket Set
(1) Front Crankshaft Seal
(1) Rear Crankshaft Seal
(1) Pick Up Tube O-Ring
(6) Rod Bearings
(1) Main Bearing Set
(1) Bypass Valve, Plunger

*Agkits.com recommends adding the camshaft bearings to the rebuild kit. These bearings are almost always worn when it comes time to rebuild. Each set includes (4) 3680580 (3) 3680581 & (7) 4026423. View this products related products tab to add them.

Piston Liner Assembly Reference:

4089894
- Includes 1 Piece Steel Piston (Open Skirt with Radius Bowl. #4923743), Liner with Seal, Pin, Retainers & Ring Set. Use in Full Sets Only. Do Not Mix Piston numbers. Must be used with drilled connecting rods.

4089895 - Includes 1 Piece Steel Piston (Open Skirt with Chamfer Bowl. #4923744), Liner with Seal, Pin, Retainers & Ring Set. Use in Full Sets Only. Do Not Mix Piston numbers. Must be used with drilled connecting rods.

4955966 - Includes 1 Piece Steel Piston (Closed Skirt with Large 2.250 Center Bowl Configuration. #2863938), Liner with Seal, Pin, Retainers & Ring Set. Use in Full Sets Only. Do Not Mix Piston numbers. Must be used with drilled connecting rods.

4955967 - Includes 1 Piece Steel Piston (Closed Skirt with Small 1.930 Center Bowl Configuration. #2863939), Liner with Seal, Pin, Retainers & Ring Set. Use in Full Sets Only. Do Not Mix Piston numbers. Must be used with drilled connecting rods.

49559868 & 4089898 - This kit is for engines equipped with EGR. This popular EGR piston is used in, but not limited to, the following engine CPL numbers: 1437, 2732, 3229, 8287, 8288, 8520, 8523



Warning: There have been several updates to the components in the ISX15 / QSX15 engines since they were original introduced. Making sure you use compatible designed components in your build is critical to the service life of this engine.

All Pistons within the engine must be of the exact same design style. You cannot mix open skirt, closed skirt and 2 piece articulated pistons in the same engine. Also, all pistons must be installed facing the correct direction. Failure to align the deep valve pocket and the piston skirt cooling notch correct will result in extensive engine damage.

  • Engines produced before 2003 were built using 2 piece articulating pistons and traditional-type, solid beam connecting rods.
  • Engines produced during or after 2003 were built using upgraded, single piece open or closed skirt pistons and "Rifle Drilled" connecting rods.  
    • Rifle Drilled Connecting rods have an oil hole drilled all the way along the inside of the shaft. This oil hole allows oil to flow to the piston pin connection. 



Earlier engines can be upgraded to the newer, single piece piston design, but you MUST USE RIFLE DRILLED CONNECTING RODS when installing single piece pistons. Non-drilled rods will not provide sufficient lubrication to the piston pin and can/will result in engine damage and/or failure. Rifle Drilled connecting rods for this application can be viewed / purchased here.


For all types of pistons within this platform, the manufacturer recommends a heavy film of 85w-140 gear oil with an EP (Extreme Protection) additive be applied to three specific areas during initial installation. Failure to lubricate these areas properly can result in engine damage and/or failure.
  1. Piston pin bore inside diameter
  2. Rod Bushing inside diameter
  3. Piston Pin





Engine Torque Specs:
Rod Bearing Torque: Used Bolts: 52 ft/lbs + 60 Degrees \ New Bolts: 29 ft/lbs, Loosen, Re-Torque 52 ft/lbs, +60 Degrees
Main Bearing Torque: Before engine serial number 79012120, 110 ft/lbs + 110 Degrees / After engine serial number 79012120, 300 ft/lbs, loosen, 300 ft/lbs + 90 Degrees
Intake Valve Lash .014" Cold
Exhaust Valve Lash .027" Cold
Cylinder Head Torque: 148 ft/lbs, 300 ft/lbs, +90 Degrees
Cylinder Head Torque Sequence ISX Cummins

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