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Preparing a Caterpillar diesel engine block deck for cylinder head installation during a major in-frame or out-of-frame overhaul? Attempting to verify cylinder liner protrusion using unguided depth micrometers, magnetic indicator stands, or feeler gauges introduces fatal measurement errors, leading directly to uneven head gasket crush, blown fire rings, coolant contamination, and liner counterbore fretting. The ATC 1P-2402 Caterpillar Liner Height Gauge delivers a rock-solid, precision-machined reference sled with a metric dial indicator to measure liner protrusion down to hundredths of a millimeter across CAT 3400, C13, C15, C18, and 3500 series engine blocks.

The Critical Physics of Caterpillar Cylinder Liner Deck Clamp & Gasket Crush

On heavy-duty Caterpillar diesel engines—including the 3300, 3400, 3500, C9, C12, C13, C15, and C18 platforms—cylinder liners must extend slightly above the top deck surface of the cylinder block. This precise height delta is known as "liner protrusion." When the cylinder head is torqued down, this protrusion compresses the metallic combustion seal (fire ring) of the head gasket with maximum, uniform clamping pressure. If liner protrusion is insufficient or uneven across four measurement points around the circumference of a single flange, the head gasket cannot seal properly. High-pressure combustion gases bypass the fire ring, cutting heat grooves into the head deck and blowing coolant out of the expansion tank. Conversely, if protrusion is excessive, cylinder head clamping force concentrates entirely on the liner flange, causing counterbore ledge cracking or liner distortion that leads to rapid piston ring scuffing. Universal magnetic-base dial indicators flex under shop vibration and tilt relative to the deck surface (cosine error). The ATC 1P-2402 sled gauge completely eliminates these metrology risks. Designed as a direct functional equivalent to OEM tool CAT 1P-2402, its precision-ground steel sled spans the cylinder block deck face securely. Equipped with a high-accuracy metric dial indicator, it establishes an absolute zero baseline on the block deck, allowing machinists and mechanics to record exact liner lip elevation and calculate required counterbore shims with complete accuracy.

• Targeted Caterpillar Engine Compatibility – Engineered specifically for liner protrusion and counterbore depth metrology on Caterpillar diesel engines (3300, 3400, 3500, C7, C9, C12, C13, C15, C18).
• Direct OEM Special Tool Replacement – High-strength aftermarket replacement for Caterpillar factory tool part number **1P-2402** (1P2402).
• High-Precision Metric Dial Indicator – Features a clear, easy-to-read metric dial gauge for fine-increment measurement of liner lip protrusion and counterbore ledge depth.
• Precision-Ground Steel Sled Architecture – Flat reference base bridges the block deck surface to eliminate flex, tilting, and off-axis measurement errors.
• Prevents Blown Head Gaskets & Counterbore Fretting – Ensures liner protrusion meets exact OEM specifications prior to cylinder head bolt torquing.

Stop Guessing Liner Height. Command Total Caterpillar Deck Metrology Precision.

The ATC 1P-2402 Caterpillar Liner Height Gauge (Metric) is an essential capital asset for commercial diesel machine shops, CAT dealership service bays, engine remanufacturers, and heavy fleet maintenance centers. Protect head gaskets, verify counterbore shims, and measure liner protrusion with complete mechanical authority using Apex tools.

Technical Specifications

Technical Metric	Value / Fitment Reference Guidelines
Target Engine Platforms	Caterpillar Commercial Diesel Engines (3300, 3400, 3500, C-Series)
Primary Operational Function	Precision measurement of cylinder liner protrusion and counterbore ledge depth relative to deck
Included Metrology Gauge	High-accuracy Metric Dial Indicator with precision contact point stem
OEM Special Tool Cross Reference	Direct functional replacement for Caterpillar factory tool 1P-2402 (1P2402)
Part / Model Reference Number	ATC 1P-2402 (ATC1P-2402 / 1P2402 Metric)
Total Package Shipping Weight	2.00 lbs (Precision machined tool steel sled and gauge assembly)

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