Don't guess on your gear train. The JT07223A is the OEM-style timing kit designed to lock the crankshaft, camshaft, and injection pump on John Deere 3179, 4239, 6359, 4276, and 6414 diesel engines.

The High Stakes of Diesel Engine Timing

On mechanically timed John Deere engines like the 4239 or 6359, timing isn't just a suggestion—it's the difference between a smooth-running machine and a catastrophic internal collision. Even a single tooth of misalignment can lead to excessive smoke, hard starting, and melted pistons.

• OEM-Style Accuracy – This kit is engineered to match factory specifications for the 3179, 4239, 6359, 4276, and 6414 platforms.
• Total Component Control – Simultaneously lock and align the crankshaft, camshaft, and injection pump to ensure every stroke is perfectly synchronized.
• Eliminate Gear Walk – Positive locking capabilities prevent components from shifting during high-torque tightening or gear train service.
• Professional Durability – Precision-machined from high-strength materials to withstand the heavy-duty environment of ag and construction shops.
• Versatile Application — From legacy tractors to industrial power units, this kit covers the most common mid-range John Deere diesel engines.

What is the JT07223A Timing Set?

The JT07223A Timing Tool Set is a specialized service kit that replaces the need for "trial-and-error" adjustments. It provides the physical locking pins and alignment references required to perform injection pump timing, camshaft synchronization, and full engine overhauls with 100% confidence.

Engine Compatibility & Specs

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