Caterpillar Technology—Marine Engine Emissions Upgrade Group Kit #7 (Tier 2 to Tier 3), Kit #8 (Tier 1 to Tier 3), Kit #9 (EUI to Tier 3) and Kit #10 (MUI to Tier 3)

Verified Technologies for SmartWay and Clean Diesel

This retrofit technology is included on EPA's Verified Technologies List for Clean Diesel.

• Technology specifications
• Criteria to achieve emission reductions
• Verification letters from EPA

Technology specifications

Criteria to achieve emission reductions

The following criteria must be met in order for appropriately retrofitted engines to achieve the aforementioned emission reductions:

1. The servicing dealer must follow specific installation instructions approved by Caterpillar and validate that the upgraded engine has the necessary components installed and has been tested to ensure the proper fuel delivery, power, torque and speed. The dealer must submit a validation form to Caterpillar in order to receive a label for the upgraded engine.
2. The original Caterpillar 3500 Marine Engine includes mechanical unit injectors (MUI), electronic unit injectors (EUI), Tier 1 or Tier 2 engine. The electronic control module (ECM) must be replaced or updated as part of the upgrade. The primary critical new components are turbocharger, pistons, valve mechanism, injectors, electronic controls, and other installation parts as necessary.
3. The engine must be operated on ultra-low sulfur diesel fuel (ULSD) of 15 ppm or less.
4. This verification is for engines used in vessels with variable speed propulsion systems and is not applicable for engines used in recreational or constant speed propulsion applications.

Verification Letters from EPA

• Verification Letter for Cat Marine Tier 3 (pdf) (157.32 KB, May 2021)