Cadillac 3.6L V6 Remanufactured Engine – 2004-2006

Description

Halt timing chain stretch, eliminate camshaft journal scoring under high-speed expressway operation, and maintain 55 PSI hot cruise oil pressure across demanding executive fleet routes using the Cadillac CTS 3.6L LY7 Remanufactured Engine engineered for 2004 to 2006 Cadillac CTS, STS, and SRX commercial fleet vehicles. This 24-valve DOHC High Feature V6 platform restores high passing torque and dependable service.

Cast from high-strength aluminum alloy with cast-in iron cylinder liners, this longitudinal 60-degree V6 utilizes an aluminum lower crankcase bedplate that halts bottom-end deflection during high-RPM expressway transit. A micro-polished forged steel crankshaft turns within tri-metal bearings, linked to forged powdered metal connecting rods and graphite-coated hypereutectic aluminum pistons. Cylinder decks receive an Ra 30 finish for MLS gasket sealing. Dry weight registers at 370 lbs with a 6.0-quart capacity aluminum oil pan.

Key Features of Cadillac CTS 3.6L LY7

Executive transport fleet directors buy Cadillac CTS 3.6L LY7 remanufactured engine packages to keep corporate luxury sedans and crossover haulers running on schedule. Every remanufactured long block undergoes vacuum decay testing to guarantee total fluid circuit separation before crate departure.

• Dual overhead camshafts actuate four valves per cylinder through low-friction roller rocker followers
• Four-cam continuous variable valve timing optimizes torque production across broad engine speeds
• 0.0011 to 0.0018 inch main bearing clearances maintain solid hydrodynamic lubrication film strength
• Upgraded primary timing chains eliminate chain stretch failure risks across severe service intervals
• Multi-layer steel cylinder head gaskets maintain combustion seals across extreme summer transit heat
• High-flow internal trochoid oil pumps channel pressurized lubricant to overhead camshaft journals
• Precision rotating package balancing protects Cadillac CTS 3.6L LY7 driveline parts from vibration

Cadillac LY7 Operational Combustion Limits

Operating lubricant pressure produces 18 to 22 PSI during warm idle and expands to 50 through 65 PSI at 2600 RPM cruise speeds. Internal coolant temperatures stabilize between 190°F and 205°F using factory thermostat ratings. This 3.6-liter High Feature V6 generates 255 horsepower at 6500 RPM and 252 lb-ft continuous torque at 3200 RPM with a 10.2:1 compression ratio. Cylinder cranking pressure measures between 170 and 185 PSI across all six chambers. The cooling system rejects 3100 BTU per minute during full-throttle highway transit.

Cadillac LY7 Crankshaft Transmission Alignment

A 6-bolt rear crankshaft flange mounts flush to factory 5L40E 5-speed automatic transmission flexplates or manual flywheels. Measured crankshaft thrust endplay checks out between 0.0030 and 0.0070 inches. The 1.102-inch front crankshaft snout features a single keyway to position the timing chain drive gear and harmonic balancer, holding true accessory drive serpentine belt pulley alignment.

Cadillac LY7 Fleet Servicing Protocols

Technicians must prime the engine oil pump prior to first startup by cranking the starter without ignition until oil pressure warning lamps extinguish. Fill the crankcase with 5W-30 synthetic motor oil meeting GM dexos standards. This production engine is not engineered for turbocharging exceeding factory parameters, nitrous injection, or competitive track racing.

• Check crankcase oil level and coolant tank fluid volume each shift before driving
• Drain break-in motor oil and install fresh oil filter after 500 initial miles
• Perform routine oil and filter changes every 4000 miles during commercial transit cycles

Cadillac LY7 Commercial Warranty Details

Commercial fleet purchasers receive a 3-Year / 100,000-Mile commercial fleet warranty covering structural casting and internal moving components. The heavy-duty wood crate contains one remanufactured long block engine, a complete engine install gasket set, spark plug well seals, front timing cover seals, dyno test documentation, and priming instructions.