3.6L Twin-Turbo LF3 Engine Complete Assembly for 2014-2019 Cadillac

A quick look at your own vehicle makes sure the right engine shows up:

• Confirm that the 8th digit of your vehicle's VIN is '8'.
• Confirm your Cadillac CTS is a rear-wheel-drive (RWD) or all-wheel-drive (AWD) longitudinal platform.
• Verify that your vehicle is a CTS V-Sport equipped with the 3.6L Twin-Turbo engine by checking for the visual presence of two turbochargers under the hood.

What the install really takes — plan and budget with confidence:

Special tools this job needs:

• EN-48383 Camshaft Retaining Tool Set
• EN-49982 (or ST-250) Timing Chain Retention Tool
• EN-46106 Flywheel/Crankshaft Locking Tool
• GM-47716-30A Cooling System Fill Adapter
• Fuel line disconnect tool set
• Torque wrench and angle gauge

Budget for these consumables at install:

• 7.0 quarts (6.6 liters) of full synthetic 5W-30 motor oil meeting GM dexos1 Gen 2 or Gen 3 specifications
• New high-quality spin-on oil filter (e.g., AC Delco PF63 or equivalent)
• DEX-COOL 50/50 pre-diluted coolant (approx. 14.5 quarts total capacity)
• 6 new iridium spark plugs (OEM spec: AC Delco 41-147 / GM 12662396), gapped strictly to 0.030" to 0.035"
• Intake manifold gasket set (upper and lower)
• Valve cover gaskets
• Exhaust manifold gaskets
• Turbocharger oil feed and drain line gaskets/O-rings
• Torque-to-yield (TTY) bolts (head bolts, main bearing bolts, and HPFP mounting bolts)

What your vehicle’s computers will need after the swap:

What’s involved: Immobilizer Relearn (VTD System), Crankshaft Position (CKP) Variation Relearn, and Idle Relearn Procedure

A GM dealer or a specialty shop with a dealership-level scan tool (such as GM GDS2) is required to perform the necessary module programming, anti-theft synchronization, and crankshaft position relearn.

Pro tips for a smooth first start-up — hand them to whoever does the install:

• Intercooler Vacuum Filling: The LF3 uses an integrated charge-air cooler system. You must use a vacuum-fill tool to completely bleed the intercooler circuit to prevent high intake air temperatures.
• Turbo Oil Line O-Rings: You must replace the O-rings and gaskets on the turbo oil feed and return lines to prevent oil leaks and fire hazards.
• High-Pressure Fuel Pump (HPFP) Bolt Torque: The mounting bolts are torque-to-yield. Reusing or over-torquing them can strip the threads in the aluminum head.
• Fragile Vacuum Lines: The vacuum lines controlling the turbo wastegates are extremely brittle and easily cracked during installation.
• Tight Clearances: The engine bay is tight; removal of the entire front cooling package (radiator, condenser) is often required to clear the passenger side.
• Ground Straps: Ensure all engine-to-chassis ground straps are clean and securely reconnected.

Easy to get right once you know them:

• Ordering for an XTS V-Sport: The XTS is a front-wheel-drive/transverse platform, whereas the CTS is a rear-wheel-drive/longitudinal platform. This engine will not fit an XTS.
• Assuming Turbos are Included: This unit is sold without the turbochargers. You must transfer your existing turbos, wastegates, and charge pipes.
• Neglecting the Timing Chains: Installing a used 109k-mile GM 3.6L engine without replacing the timing chains and tensioners first is a major gamble.
• Reusing Spark Plugs: Reusing old spark plugs or failing to gap new ones correctly (.030".035") frequently leads to severe misfires under boost.
• Ignoring Turbo Health: Reusing old turbochargers without flushing or replacing contaminated oil cooler lines can destroy the turbos and the new engine.

Not issues with the units on this page — the manufacturer documented these for every engine of this family, wherever you buy one. Handy for your installer: