The ATCISX20 .020″ brass liner shim restores proper counterbore depth in Cummins ISX engines, ensuring precise liner protrusion and sealing. Ideal for machined or worn blocks, this shim prevents leaks and maintains compression for heavy-duty performance.

The Critical Risks of Improper Liner Protrusion in Cummins ISX Engines

Cummins ISX engines handle extreme loads, but worn or machined counterbores cause liner misalignment, leading to leaks, compression loss, and failure. Without shims, these issues escalate repair costs.

• Compression leaks – Poor protrusion allows blow-by, reducing power and requiring $1,000–$2,500 gasket jobs
• Coolant contamination – Misaligned liners mix fluids, causing $3,000–$6,000 bearing damage
• Overheating failures – Uneven sealing leads to hot spots, totaling $2,000–$4,000 head warps
• Downtime losses – Rebuild delays add $300–$700/hour in fleet idle
• Block rework – Severe wear demands machining, costing $1,500–$3,000
• Complete rebuild – Cascading failures require full overhauls ($8,000–$15,000)

What is the ATCISX20 .020″ Brass Liner Shim?

The ATCISX20 .020″ Brass Counterbore Liner Shim – Cummins ISX is a precision brass shim that compensates for counterbore wear or machining in ISX blocks. Its malleable brass allows for minor deviations while providing superior sealing.

Designed for professional rebuilders, the ATCISX20 restores OEM liner protrusion, prevents leaks, and extends engine life in heavy-duty applications.

Complete Shim Specifications & Cummins ISX Compatibility

Professional Features & Engine Rebuild Benefits

Economic Impact: Liner Shim Rebuild ROI

Scenario	Cost Impact
ATCISX20 proper shim use	Sealing restore – $40 shim investment
Blow-by compression loss	$1,000–$2,500 gasket jobs
Fluid contamination	$3,000–$6,000 bearing damage
Hot spot warping	$2,000–$4,000 head fixes
Block rework	$1,500–$3,000 machining
Total improper protrusion cost	$7,500–$15,500 per failure
ATCISX20 ROI (first prevention)	188–388X return on investment

When Cummins Rebuilders Choose ATCISX20

• Cummins ISX counterbore shimming
• Block wear compensation
• Liner protrusion restoration
• Shim cut rebuilds
• Heavy-duty diesel shops
• Engine sealing optimization
• OEM spec maintenance

Why Professional Shops Trust ATCISX20

Cummins rebuilders trust the ATCISX20 for its .020″ precision, brass malleability, and ability to avoid $7,500–$15,500 in damages per failure. It offers sealing integrity, protrusion correction, and efficiency shops demand.

From block machining to full overhauls, this shim keeps ISX engines reliable.

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