Step-by-Step: How to Use the ATC151-4832 / 221-9777 Kit for In-Vehicle CAT C7/C9 Injector Cup Replacement
Step-by-Step: How to Replace Injector Cups on CAT 3126B/C7/C9 Engines with the ATC151-4832/221-9777 Kit
Injector cup leaks on CAT 3126B, C7, C9 cause coolant-fuel mixing. The ATC151-4832/221-9777 kit replaces them in-vehicle — no head removal. This guide walks you through HEUI-safe service.
Shipping Weight: 8.00 lbs • Eligible for Free Shipping
Step 1: Prep the Engine
Remove injector. Clean bore. Use ATC151-4832 remover to pull old cup.
Step 2: Clean & Inspect
Vacuum debris. Check bore for corrosion. Lube new cup (e.g., 227-1200).
Step 3: Install New Cup
Use 221-9777 installer to press cup in. Torque to CAT spec (e.g., 50 ft-lbs).
Step 4: Test & Reassemble
Pressure test for leaks. Reinstall injector.
Shipping Weight: 8.00 lbs • Eligible for Free Shipping
Specs at a Glance
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