393-8988 Piston with Pin for CAT 3126 3126B 3126E Engine

Complete Engine Rebuild Kit: 393-8988 Piston with Pin for CAT 3126, 3126B, 3126E Engines

Experiencing excessive oil consumption, loss of power, or high blow-by in your Caterpillar® 3126-series engine? A critical component at the heart of these issues is the piston assembly. The 393-8988 Piston with Pin for CAT 3126 3126B 3126E ENGINE is the complete, ready-to-install OEM piston kit. This genuine assembly, also part number 3938988, provides a matched piston and piston pin designed to restore original compression, performance, and longevity to your engine during an overhaul or rebuild.

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Direct Replacement for CAT 3126 Family Engines

This CAT engine piston kit is engineered as an exact fit for the following Caterpillar engine models and their numerous applications. A single kit typically includes one piston with its pre-fitted wrist pin.

• Engine Models: Directly compatible with CAT 3126, 3126B, and 3126E diesel engines.

• Primary Machine Applications:

  • On-Highway Trucks: CAT CT660, CT680, and other trucks equipped with the 3126 series engine.

  • Construction Equipment: Skid steer loaders (e.g., 246C, 256C), certain backhoe loaders, and compact track loaders.

  • Industrial & Marine: Generators, pumps, and marine auxiliary power units.

• Critical Note: For a complete cylinder rebuild, a set of six (6) 393-8988 pistons is required. Always verify your Engine Serial Number (ESN) for the correct piston specification, as variations exist.

Why Choose This Genuine CAT Piston Assembly?

1. OEM Precision for Optimal Performance: This genuine CAT piston is manufactured to exact factory tolerances for weight, ring groove dimensions, and crown design. This ensures proper compression ratio, balanced engine operation, and correct fitment within the cylinder liner.

2. Restores Engine Power & Efficiency: Worn pistons lead to compression loss, blow-by, and oil burning. Installing new OEM pistons restores cylinder sealing, combustion efficiency, and the engine’s original horsepower and fuel economy.

3. Matched Component Design: The included piston pin is precisely matched to the piston, ensuring proper clearance and lubrication. This eliminates the risk of mismatch and premature failure associated with sourcing components separately.

4. Foundation for a Reliable Rebuild: Using high-quality OEM pistons is the cornerstone of a durable engine overhaul. They are built to withstand the same demanding cycles as the originals, providing a solid foundation for thousands of hours of reliable service.

Product Specifications & Details

• Genuine Part Numbers: 393-8988 / 3938988.

• Component Type: Piston with Pin Assembly (Engine Internal Component).

• Function: The piston transfers the force of combustion to the connecting rod and crankshaft. It also houses the piston rings, which seal the combustion chamber and control oil.

• Application: A core engine rebuild part for the Caterpillar 3126 family of engines. Essential for in-frame or out-of-frame overhauls.

When to Replace Engine Pistons

The 393-8988 Piston with Pin is required during a major engine repair when the following is diagnosed:

• Low Compression: Confirmed via compression or leak-down tests.

• Excessive Blow-by: High crankcase pressure and smoke from the breather tube.

• Oil Consumption: Severe oil burning not resolved by other components (e.g., valve seals).

• Physical Damage: Scuffed, cracked, or holed pistons discovered during disassembly.

• Planned Overhaul: As a preventative measure during a scheduled major engine service to ensure long-term reliability.

Order Your CAT 3126 Series Piston Kit Today

Invest in the core of your engine rebuild. Our genuine 393-8988 piston with pin for CAT 3126, 3126B, 3126E engines is available individually or in complete sets.

Click to order the CAT 393-8988 Piston with Pin Assembly. Contact our team with your Engine Serial Number to confirm the exact specification and quantity needed.