Step-by-Step: How to Use the ATC-7040 Ring Compressor for Safe Piston Installation in CAT & Cummins Engines
Step-by-Step: How to Use the ATC-7040 Ring Compressor for Safe Piston Installation in CAT & Cummins Engines
Rebuilding Caterpillar C-15 or Cummins ISX engines? The ATC-7040 (PT-7040 equivalent) 5.4″ piston ring compressor is your best defense against ring damage. This guide walks you through safe installation, preventing scuffs and breaks in 5.4″ bores. At $295 and USA-made, it's a shop must-have. Tools needed: Compressor, pistons/rings, lubricant, torque wrench.
Shipping Weight: 9.00 lbs • HEAVY ITEM NOT ELIGIBLE FOR FREE SHIPPING
Step 1: Prep the Piston & Rings
Clean the piston grooves and rings. Apply lubricant to rings and bore. Stagger ring gaps (top at 12 o'clock, oil at 3/9). Pro Tip: Use with anti-polishing kits for ISX to avoid liner scratches.
Step 2: Position the Compressor
Open the ATC-7040 clamshell and place around the piston, aligning with rings. Close evenly for uniform compression – no pinching.
Step 3: Insert into Bore
Align piston with block. Gently tap with rubber mallet while holding compressor. Rings slide in without snags on C-15 or ISX bores.
Step 4: Remove Compressor & Torque
Once rings are in, open compressor and remove. Torque rod to spec. Check for smooth rotation – no binding.
Step 5: Clean Up & Repeat
Wipe tool clean. Repeat for all cylinders. Pairs well with ATC5299448 kit for APR liners.
Shipping Weight: 9.00 lbs • HEAVY ITEM NOT ELIGIBLE FOR FREE SHIPPING
Tool Specs
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