4376427 | Inframe Engine Rebuild Kit for Cummins ISX, ISX10. QSX | 152MM liner SOHC SIGNATURE CM2250 & 2350 Engine

The 4376427 In‑Frame Engine Rebuild Kit is a full-service, heavy‑duty rebuild package for Cummins ISX, ISX10, and QSX Single Overhead Camshaft engines with 152 mm bore liners. This kit is engineered for in-place installation, meaning you can rebuild without removing the engine from the chassis. Delivering OEM-quality performance with upgraded APR (Anti-Polish Ring) liner protection (optional), it is built to restore compression, reduce oil usage, and significantly extend engine service life. 

Key Features

• Designed for: Cummins ISX, ISX10 and QSX SOHC engines using 152 mm bore liners (covers CM2250 / CM2350 series)

• APR Option Available: Choose between standard or APR (anti-polish ring) liners for improved seizure resistance and reduced carbon buildup

• OEM-Equivalent or Upgraded Quality: Parts meet or exceed factory specifications, built in ISO 9001-certified facilities

• Warranty: Includes a 2-year, unlimited-mileage warranty (parts & labor) for added confidence in heavy-duty use

• Zero Core Charge: Full new kit—no used or reman parts—ensures reliability and value

Kit Contents:

• (6) Cylinder Liner Kits
  • (6) Cylinder Liners
  • (6) Carbon Scraper Rings
  • (6) .032 Liner Shims
  • (6) Rectangular Ring Seals
• (6) Piston Kits
  • (12) Retaining Rings
  • (6) Piston Ring Sets
    • (6) Top Piston Rings
    • (6) Second Piston Rings
    • (6) Oil Piston Rings
  • (6) Piston Pins
  • (6) Piston Assemblies
• (6) ISX Connecting Rod Bearings
• (1) Main Bearing Set
  • (7) Upper Main Bearings
  • (7) Lower Main Bearings
  • (4) Standard Crankshaft Thrust Bearings
• (1) O-Ring Seal
• (1) Bypass Valve Plunger
• (1) Oil Pan Gasket
• (1) Upper Engine Gasket Set
  • (1) Thermostat Seal
  • (1) O-Ring Seal
  • (1) O-Ring Seal
  • (1) O-Ring Seal
  • (1) O-Ring Seal
  • (1) Thermostat Housing Cover Gasket
  • (4) Exhaust Manifold Gaskets
  • (2) Grommet Seals
  • (1) Exhaust Manifold Gasket
  • (1) Water Seal
  • (5) O-Ring Seals
  • (6) Copper XPI Injector Seals
  • (2) Sealing Washers
  • (1) Thermostat Housing Gasket
  • (1) Exhaust Outlet Gasket
  • (1) Intake Manifold Gasket
  • (2) O-Ring Seals
  • (1) Water Seal
  • (1) Turbocharger Gasket
  • (1) Rectangular Ring Seal
  • (1) Electrical Connector Seal
  • (1) O-Ring Seal
  • (1) Rectangular Strip Seal
  • (2) Seal Carriers
  • (2) Turbo Hose O-Ring Seals
  • (1) O-Ring Seal
  • (1) O-Ring Seal
  • (1) O-Ring Seal
  • (16) Sealing Washers
  • (2) Sealing Washers
  • (8) Cavity Plugs
  • (2) Sealing Washers
  • (1) O-Ring Seal
  • (8) Sealing Washers
  • (1) Oil Drain Gasket
  • (1) Exhaust Outlet Connection Gasket
  • (1) Camshaft Cover Seal
  • (1) Injector Gasket
  • (6) O-Ring Seals
  • (3) Gaskets
  • (1) Valve Cover Gasket
  • (6) HPI/XPI O-Ring Seals
  • (2) O-Ring Seals
  • (1) Grommet Seal
  • (1) Camshaft Cover Gasket
  • (1) Cylinder Head Gasket