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Assembling or measuring cylinder block decks on Caterpillar heavy-duty diesel engines? Skipping or approximating cylinder liner protrusion measurements using standard feeler gauges, straightedges, or unanchored dial indicators causes catastrophic engine overhaul failures. Inadequate or uneven liner height above the engine deck surface destroys head gasket fire rings, causes liner flange fretting, and allows high-pressure combustion gases to blow past the gasket into the cooling jacket. Conversely, excessive liner protrusion unevenly loads the cylinder head deck, warping combustion seals and cracking cylinder liner flanges under full head bolt clamp load. Engineered for professional commercial diesel machine shops, CAT dealership rebuild stalls, and fleet overhaul facilities as an exact OEM equivalent to Caterpillar part number 1P-2402 (1P2402), the ATC 1P-2402 Liner Height Gauge & Metric Dial Indicator provides a 2.00-pound precision-ground sled block assembly and high-accuracy metric dial indicator engineered to bridge engine deck surfaces squarely—delivering true, repeatable liner protrusion and counterbore depth readings to verify shim requirements before cylinder head installation.

The Critical Physics of Head Gasket Fire Ring Crush & Counterbore Shim Precision

Caterpillar heavy-duty diesel engines rely on precise mechanical clamping force transmitted through the cylinder head gasket to compress the stainless steel fire ring around each cylinder liner flange. Proper fire ring crush requires cylinder liner protrusion—the height the liner flange extends above the block deck—to fall within tight OEM tolerances, typically measured in hundredths of a millimeter. When counterbore seats suffer erosion, carbon packing, or fretting wear, the liner drops below spec. Installing a cylinder head on a low liner results in insufficient fire ring compression. Under peak cylinder combustion pressures, combustion flames jet across the gasket face, scorching the head deck and pressurizing the radiator with exhaust gases. The ATC 1P-2402 Sled Gauge completely eliminates measurement error. The heavy, precision-ground steel sled body bridges the block deck flat, anchoring the metric dial indicator tip over the liner flange. By taking zero-point reference readings on the deck and measuring protrusion across four opposing points per liner, mechanics can accurately compute counterbore depth cuts and select exact stainless steel counterbore shims—guaranteeing uniform head gasket loading across all cylinders.

• Targeted Caterpillar Engine Platform Coverage – Built specifically for measuring cylinder liner protrusion and counterbore depth on Caterpillar diesel engine blocks.
• Direct CAT OEM Specialty Tool Interchange – Direct high-strength OEM equivalent for Caterpillar specialty tool part number **1P-2402** (1P2402 / ATC1P-2402).
• Includes Precision Metric Dial Indicator – High-sensitivity metric dial depth indicator provides crystal-clear, repeatable measurements down to hundredths of a millimeter.
• Precision-Ground Deck Bridging Sled Block – Heavy steel sled base sits dead-flat against engine deck surfaces to eliminate rocking, tilting, and false readings.
• Substantial 2.00 lbs Heavy-Duty Shop Build – Manufactured from heat-treated alloy steel and precision-ground contact points engineered for daily commercial engine rebuild shop service.

Stop Blown Head Gaskets. Command Total Caterpillar Engine Overhaul Metrology.

The ATC 1P-2402 Caterpillar Liner Height Gauge – Metric Dial Indicator is an essential capital asset for commercial truck repair centers, CAT dealership rebuild stalls, fleet maintenance facilities, and diesel machine shops. Prevent blown head gaskets, verify counterbore shims, and measure Caterpillar liner protrusion with complete mechanical authority using Apex tools.

Technical Specifications

Technical Metric	Value / Fitment Reference Guidelines
Target Engine Platforms	Caterpillar Medium and Heavy-Duty Diesel Engines (Wet & Dry Liner Block Decks)
Primary Operational Functions	Measurement of cylinder liner protrusion, counterbore depth, and deck flatness
Specialty Tool Cross Reference	Direct OEM equivalent for Caterpillar specialty tool part number 1P-2402 (1P2402)
Indicator Readout Scale	Precision Metric Dial Depth Indicator Readout Assembly
Part / Model Reference Number	ATC 1P-2402 (ATC1P-2402 / 1P-2402)
Construction Metallurgy	Precision-ground hardened alloy steel sled base with stainless indicator contact tip
Total Package Shipping Weight	2.00 lbs (Compact, precision-grade diesel machine shop gauge kit)

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