2021 Cadillac CT4 Engine Parts

This table covers the chains that drive the balance shafts. Read more

2 Balance Shaft Chain parts for the 2021 Cadillac CT4 come from S.A. GEAR.

This group includes S.A. GEAR C1283 and S.A. GEAR 76498P.

This table covers the guides that keep the balance-shaft chain on its path. Read more

This group shows a single part: S.A. GEAR 71357.

This table covers the Balance Shaft Chain tensioners. Typical signs include belt flutter, a chirp that returns after a new belt, or an arm that no longer damps. Replace the tensioner with the belt at higher mileage. Read more

One part is listed for the 2021 Cadillac CT4 — S.A. GEAR 91498.

This table covers the Balance Shaft sprockets. Read more

This group shows a single part: S.A. GEAR S1596.

This table covers the camshafts that open the valves. Read more

3 Camshaft parts for the 2021 Cadillac CT4 come from GM GENUINE.

Listed part numbers: GM GENUINE 12745084, GM GENUINE 12698637 and GM GENUINE 12739839.

This table covers the Circular / Semi-Circular plugs. Typical signs include a leak at the drain or glow-plug hole, or a plug that has rounded off. Replace the crush washer and torque to the spec in the notes. Read more

One part is listed for the 2021 Cadillac CT4 — GM GENUINE 11546667.

This table covers lower / conversion gasket sets for oil-pan and related joints. Typical signs include the leaks that sent the engine or gearbox to the bench. Use every gasket the set is meant for that opening — leftover unused pieces usually belong to another configuration. Read more

This group shows a single part: AJUSA 54324900.

This table covers the crankshafts that turn piston motion into rotation. Read more

This group shows a single part: GM GENUINE 12664179.

This table covers the front and rear seals that keep oil in at the crankshaft. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

3 Crankshaft Seal parts are listed for the 2021 Cadillac CT4, from AJUSA and GM GENUINE.

This group includes AJUSA 71015600, AJUSA 71017300 and GM GENUINE 12693989.

This table covers the Crankshaft Seal covers. Read more

This group shows a single part: GM GENUINE 12741554.

This table covers the cylinder heads that close the top of the block. Read more

One part is listed for the 2021 Cadillac CT4 — GM GENUINE 12733805.

This table covers the Cylinder Head Alignment Dowel pins. Read more

This group shows a single part: GM GENUINE 12570326.

This table covers the bolts that clamp the cylinder head to the block. Read more

3 Cylinder Head Bolt parts for the 2021 Cadillac CT4 come from 2 brands — GM GENUINE and AJUSA.

Part numbers include AJUSA 81083600, GM GENUINE 11603109 and GM GENUINE 11547740.

This table covers the head gaskets that seal the block to the cylinder head. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

3 Cylinder Head Gasket parts for the 2021 Cadillac CT4 come from 3 brands — AJUSA, FEL-PRO and GM GENUINE.

Listed part numbers: AJUSA 10267200, FEL-PRO 26921PT and GM GENUINE 12691233.

This table covers multi-piece gasket sets for a cylinder-head job. Typical signs include the leaks that sent the engine or gearbox to the bench. Use every gasket the set is meant for that opening — leftover unused pieces usually belong to another configuration. Read more

This group shows a single part: AJUSA 52621300.

This table covers the Cylinder Head plugs. Typical signs include a leak at the drain or glow-plug hole, or a plug that has rounded off. Replace the crush washer and torque to the spec in the notes. Read more

One part is listed for the 2021 Cadillac CT4 — GM GENUINE 11546667.

This table covers the Engine Block drain plugs. Read more

This group shows a single part: GM GENUINE 11602951.

This table covers the block heaters that warm the coolant or oil in cold weather. Read more

One part is listed for the 2021 Cadillac CT4 — GM GENUINE 12586687.

This table covers the Engine Cover grommets. Read more

GM GENUINE supplies both parts for the 2021 Cadillac CT4.

This group includes GM GENUINE 12594875 and GM GENUINE 12737359.

This table covers full gasket kits covering the joints opened in an engine rebuild. Typical signs include the leaks that sent the engine or gearbox to the bench. Use every gasket the set is meant for that opening — leftover unused pieces usually belong to another configuration. Read more

This group shows a single part: AJUSA 50555700.

This table covers the exhaust valves that let combustion gas out of the cylinder. Typical signs include a circuit that will not hold, a whistle, or a code for this valve. A stuck valve is often debris. Clean the ports before installing the new one. Read more

One part is listed for the 2021 Cadillac CT4 — MELLING V5845.

This table covers the followers that drive a mechanical fuel pump off the camshaft. Read more

This group shows a single part: GM GENUINE 12718357.

This table covers the crankshaft pulleys / harmonic balancers at the front of the engine. Read more

This group shows a single part: GM GENUINE 12695128.

This table covers the Intake insulators. Read more

This group shows a single part: GM GENUINE 12559120.

This table covers the Intake manifolds. Typical signs include an exhaust tick, a vacuum leak, or a gasket that has burned through. Replace the gaskets and hardware; a warped flange will leak with a new gasket alone. Read more

One part is listed for the 2021 Cadillac CT4 — GM GENUINE 12698870.

This table covers the Intake Manifold bolts. Read more

This group shows a single part: GM GENUINE 11548171.

This table covers the gaskets between the intake manifold and the cylinder head. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

2 Intake Manifold Gasket parts for the 2021 Cadillac CT4 come from 2 brands — AJUSA and GM GENUINE.

Part numbers include AJUSA 13336500 and GM GENUINE 12663540.

This table covers the intake valves that let air (and fuel, on port-injected engines) into the cylinder. Typical signs include a circuit that will not hold, a whistle, or a code for this valve. A stuck valve is often debris. Clean the ports before installing the new one. Read more

One part is listed for the 2021 Cadillac CT4 — MELLING V5844.

This table covers the mounts that hold the engine to the chassis. Typical signs include a clunk on takeoff, a vibration at idle, or a separated rubber insert. Support the powertrain before unbolting a mount, and torque the fasteners in the notes. Read more

GM GENUINE supplies the 3 Motor Mount parts for the 2021 Cadillac CT4.

Part numbers include GM GENUINE 85156938, GM GENUINE 85156937 and GM GENUINE 85156939.

This table covers the Motor Mount bolts. Read more

This group shows a single part: GM GENUINE 11549341.

This table covers the engine oils listed by grade and specification for this engine. Typical signs include a low-oil lamp, knocking after a long interval, or oil that has gone thin and black well before the next service. Match the viscosity and spec in the notes (and on the filler cap). The tables group grades — they are not interchangeable. Read more

20 Oil parts are listed for the 2021 Cadillac CT4, from MOBIL, LIQUI MOLY, VALVOLINE and 3 other brands. ACDELCO 109324 carries the "Popular" badge.

In the Full Synthetic grade, LIQUI MOLY, VALVOLINE, MOBIL and 3 other brands supply 17 parts: full-synthetic oils. A representative part number is ACDELCO 109324.

The High Mileage (>75,000 Miles) section lists 2 options from MOBIL — oils grouped for high-mileage engines. MOBIL 123842 is listed in this group.

1 ungrouped part is not assigned to a grade, with the same engine-level match.

This table covers the heat exchangers that cool engine oil. Typical signs include oil at the cooler fittings, or coolant that looks like a milkshake. Pressure-test both circuits after a cooler swap — a leak here mixes oil and coolant. Read more

4 Oil Cooler parts are listed for the 2021 Cadillac CT4, from GM GENUINE, DORMAN and GPD.

This group includes DORMAN 918499, GM GENUINE 12699975 and GM GENUINE 12738946 and the remaining parts above.

This table covers the gaskets that seal the Oil Cooler. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

2 Oil Cooler Gasket parts for the 2021 Cadillac CT4 come from 2 brands — ACDELCO and DORMAN.

Part numbers include ACDELCO 12670864 and DORMAN 66219.

This table covers the seals at the Oil Cooler. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

4 Oil Cooler Seal parts for the 2021 Cadillac CT4 come from 3 brands — ACDELCO, ELRING and GM GENUINE.

Listed part numbers: ACDELCO 12698624, ACDELCO 12670864 and ELRING B17840, plus the other parts above.

This table covers the seals at the Oil Dipstick / Tube. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

3 Oil Dipstick / Tube Seal parts for the 2021 Cadillac CT4 come from 2 brands — GM GENUINE and FEL-PRO.

Part numbers include FEL-PRO 73889, GM GENUINE 24504031 and GM GENUINE 12670252.

This table covers the drain plugs in the oil pan. Read more

3 Oil Drain Plug parts are listed for the 2021 Cadillac CT4, from DORMAN and GM GENUINE.

Part numbers include DORMAN 090854CD, DORMAN 090854 and GM GENUINE 12713651.

This table covers the crush washers and gaskets under the oil drain plug. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

2 Oil Drain Plug Gasket parts for the 2021 Cadillac CT4 come from 2 brands — AJUSA and GM GENUINE.

Part numbers include AJUSA 16503200 and GM GENUINE 12667457.

This table covers the Oil Drain Plug Removal tools. This is a service tool, not a wear part — match the application in the notes. Read more

One part is listed for the 2021 Cadillac CT4 — DORMAN 090999.

This table covers the caps on the oil filler neck. Read more

3 Oil Filler Cap parts are listed for the 2021 Cadillac CT4, from ACDELCO, CALORSTAT and MOTORAD.

Part numbers include ACDELCO FC268, CALORSTAT OC2314 and MOTORAD MO190.

This table covers the gaskets that seal the Oil Filler Cap. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

This group shows a single part: GM GENUINE 24100002.

This table covers the oil filters that screw onto this engine's filter mount. Typical signs include low oil pressure after a service, or a filter that will not spin off because the old gasket stayed on the block. Lube the new gasket and tighten to the spec on the box; a double-gasket install dumps the sump on the first drive. Read more

11 Oil Filter parts are listed for the 2021 Cadillac CT4, from WIX, ACDELCO, FVP and 6 other brands. WIX WL10351XP carries the "Popular" badge.

In the Economy grade, FVP, PRO-TEC and VARIOUS MFR supply 3 parts: the catalog's value-priced group. A representative part number is FVP R0351.

In the High Performance / Heavy Duty grade, WIX and MOBIL supply 2 parts: grouped under the catalog's "High Performance / Heavy Duty" designation — the notes column spells out what sets them apart. A representative part number is WIX WL10351XP.

The Standard Replacement section lists 6 options from ACDELCO, WIX, HASTINGS / BALDWIN and 2 other brands — built to original-equipment specification. ACDELCO PF66 is listed in this group.

This table covers the Oil Filter Adapter Gasket O-rings. Typical signs include a seep at a fitting or a housing that weeps after a service. Lube the new O-ring with the fluid it will see, and do not roll it into the groove. Read more

This group shows a single part: GM GENUINE 12675796.

This table covers the Oil Galley plugs. Typical signs include a leak at the drain or glow-plug hole, or a plug that has rounded off. Replace the crush washer and torque to the spec in the notes. Read more

One part is listed for the 2021 Cadillac CT4 — GM GENUINE 11570754.

This table covers the oil pans that hold the engine's oil sump. Read more

2 Oil Pan parts for the 2021 Cadillac CT4 come from 2 brands — DORMAN and GM GENUINE.

This group includes DORMAN 266010 and GM GENUINE 12713652.

This table covers the gaskets between the oil pan and the block. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

2 Oil Pan Gasket parts are listed for the 2021 Cadillac CT4, from GM GENUINE and VICTOR REINZ.

Part numbers include GM GENUINE 12663435 and VICTOR REINZ 703141410.

This table covers the Oil pumps. Typical signs include noise from the pump, no pressure, or fluid that never arrives at the outlet. Prime or fill the pump as the notes require. A dry start is a common way to kill a new unit. Read more

One part is listed for the 2021 Cadillac CT4 — GM GENUINE 12740051.

This table covers the Oil Pump Control Valve solenoids. Typical signs include a harsh or missing shift, or a code for this solenoid circuit. Check resistance and the connector before dropping the pan for a solenoid. Read more

This group shows a single part: GM GENUINE 12740050.

This table covers the Oil Temperature senders. Read more

3 Oil Temperature Sender parts for the 2021 Cadillac CT4 come from 3 brands — ACDELCO, GM GENUINE and STANDARD MOTOR PRODUCTS.

Listed part numbers: ACDELCO 15494665, GM GENUINE 55494665 and STANDARD MOTOR PRODUCTS TX352.

This table covers the Piston Pin retainers. Read more

One part is listed for the 2021 Cadillac CT4 — GM GENUINE 01647383.

This table covers the rings that seal each piston to the cylinder wall. Read more

This group shows a single part: GM GENUINE 12693554.

This table covers the Rocker Arm nuts. Read more

This group shows a single part: GM GENUINE 11546449.

This table covers the timing chains that keep the cams in time with the crank. Read more

2 Timing Chain parts for the 2021 Cadillac CT4 come from 2 brands — GM GENUINE and S.A. GEAR.

Part numbers include GM GENUINE 12671642 and S.A. GEAR C1282.

This table covers kits that group a timing chain with the related tensioners and guides. Read more

S.A. GEAR supplies the 3 Timing Chain & Component Kit parts for the 2021 Cadillac CT4.

Listed part numbers: S.A. GEAR 76498T, S.A. GEAR 76498S and S.A. GEAR 76498.

This table covers the guides and dampers that keep the timing chain on its path. Read more

2 Timing Chain Guide / Damper parts for the 2021 Cadillac CT4 come from S.A. GEAR.

This group includes S.A. GEAR 71358 and S.A. GEAR 91497.

This table covers the tensioners that keep the timing chain taut. Typical signs include belt flutter, a chirp that returns after a new belt, or an arm that no longer damps. Replace the tensioner with the belt at higher mileage. Read more

2 Timing Chain Tensioner parts are listed for the 2021 Cadillac CT4, from GM GENUINE and S.A. GEAR.

This group includes GM GENUINE 12736204 and S.A. GEAR 91496.

This table covers the seals at the Timing Chain Tensioner Gasket. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

This group shows a single part: GM GENUINE 12678978.

This table covers the Timing Cover bolts. Read more

GM GENUINE supplies both parts for the 2021 Cadillac CT4.

Part numbers include GM GENUINE 11548002 and GM GENUINE 11547061.

This table covers the seals at the Timing Cover. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

GM GENUINE supplies both parts for the 2021 Cadillac CT4.

Listed part numbers: GM GENUINE 12689669 and GM GENUINE 12741846.

This table covers the crankshaft sprockets that drive the timing chain or belt. Read more

2 Timing Crank Sprocket parts are listed for the 2021 Cadillac CT4, from GM GENUINE and S.A. GEAR.

Listed part numbers: GM GENUINE 12725693 and S.A. GEAR S1594.

This table covers the Timing gears. Read more

This group shows a single part: S.A. GEAR S1595.

This table covers the turbochargers that compress intake air. Read more

2 Turbocharger parts are listed for the 2021 Cadillac CT4, from GM GENUINE and GPD.

Listed part numbers: GM GENUINE 12747531 and GPD 2513012.

This table covers the Turbocharger Boost sensors. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors. Read more

2 Turbocharger Boost Sensor parts for the 2021 Cadillac CT4 come from 2 brands — WELLS and GM GENUINE.

The Economy section: 1 option from WELLS. WELLS 5S13833 is listed in this group.

Standard Replacement: 1 part, from GM GENUINE. A representative part number is GM GENUINE 12694431.

Part numbers include WELLS 5S13833 and GM GENUINE 12694431.

This table covers the Turbocharger Coolant lines. Typical signs include a wet fitting, a rusted pipe, or a pressure loss in this circuit. Flare or thread the new line the way the notes specify; a kinked replacement will fail early. Read more

2 Turbocharger Coolant Line parts are listed for the 2021 Cadillac CT4, from GM GENUINE and SUNSONG.

Listed part numbers: GM GENUINE 12735554 and SUNSONG 5804180.

This table covers the gaskets that seal the Turbocharger. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

2 Turbocharger Gasket parts for the 2021 Cadillac CT4 come from 2 brands — AJUSA and GM GENUINE.

Part numbers include AJUSA JTC12678 and GM GENUINE 12687166.

This table covers the Turbocharger Oil lines. Typical signs include a wet fitting, a rusted pipe, or a pressure loss in this circuit. Flare or thread the new line the way the notes specify; a kinked replacement will fail early. Read more

One part is listed for the 2021 Cadillac CT4 — AJUSA OP11478.

This table covers the Turbocharger Oil Line Gasket O-rings. Typical signs include a seep at a fitting or a housing that weeps after a service. Lube the new O-ring with the fluid it will see, and do not roll it into the groove. Read more

GM GENUINE supplies the 3 Turbocharger Oil Line Gasket / O-Ring parts for the 2021 Cadillac CT4.

This group includes GM GENUINE 12663528, GM GENUINE 12663529 and GM GENUINE 12696999.

This table covers the Turbocharger Wastegate Solenoid actuators. Typical signs include a door or range that will not move, or a click with no motion. Confirm the command signal before replacing the actuator — a failed module looks the same. Read more

3 Turbocharger Wastegate Solenoid / Actuator parts are listed for the 2021 Cadillac CT4, from BOSCH, GM GENUINE and STANDARD MOTOR PRODUCTS.

This group includes BOSCH 0280751040, GM GENUINE 12747530 and STANDARD MOTOR PRODUCTS TBA5.

This table covers the Turbocharger Wastegate Solenoid / Actuator retainers. Read more

One part is listed for the 2021 Cadillac CT4 — GM GENUINE 12692513.

This table covers the Valve covers. Read more

This group shows a single part: GM GENUINE 12700662.

This table covers the gaskets that seal the valve cover to the cylinder head. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

2 Valve Cover Gasket parts are listed for the 2021 Cadillac CT4, from AJUSA and GM GENUINE.

This group includes AJUSA 11176500 and GM GENUINE 12663348.

This table covers the lifters / tappets that transfer cam motion to the valves. Read more

2 Valve Lifter parts are listed for the 2021 Cadillac CT4, from AJUSA and GM GENUINE.

This group includes AJUSA 85024900 and GM GENUINE 12663277.

This table covers the Valve Spring retainers. Read more

This group shows a single part: MELLING VSR723.

This table covers the keepers that lock each valve-spring retainer to the stem. Read more

3 Valve Spring Retainer Keeper parts for the 2021 Cadillac CT4 come from 3 brands — MELLING, QUALCAST and SBI.

Listed part numbers: MELLING VL1098, QUALCAST 345021 and SBI 1211098.

This table covers the seals on each valve stem that control oil into the guides. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

AJUSA supplies the 3 Valve Stem Seal parts for the 2021 Cadillac CT4.

Part numbers include AJUSA 12047700, AJUSA 12047800 and AJUSA 57094200.

This table covers the oil-control solenoids that command the cam phasers. Typical signs include a door or range that will not move, or a click with no motion. Confirm the command signal before replacing the actuator — a failed module looks the same. Read more

5 Variable Valve Timing (VVT) Solenoid / Actuator parts are listed for the 2021 Cadillac CT4, from GM GENUINE, STANDARD MOTOR PRODUCTS and WALKER PRODUCTS. GM GENUINE 12731702 carries the "Popular" badge.

Economy: 1 part, from WALKER PRODUCTS. A representative part number is WALKER PRODUCTS 5901402.

The Standard Replacement section: 4 options from GM GENUINE and STANDARD MOTOR PRODUCTS. GM GENUINE 12731702 is listed in this group.

Listed part numbers: GM GENUINE 12731702, WALKER PRODUCTS 5901402 and GM GENUINE 12736876, plus the other parts above.

This table covers the seals at the Variable Valve Timing (VVT) Solenoid Gasket. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

2 Variable Valve Timing (VVT) Solenoid Gasket / Seal parts for the 2021 Cadillac CT4 come from GM GENUINE.

Part numbers include GM GENUINE 12663572 and GM GENUINE 12698384.

This table covers the cam phaser sprockets used by the variable-valve-timing system. Read more

5 Variable Valve Timing (VVT) Sprocket parts are listed for the 2021 Cadillac CT4, from GM GENUINE, ACDELCO and STANDARD MOTOR PRODUCTS. GM GENUINE 12709014 carries the "Popular" badge.

Listed part numbers: GM GENUINE 12709014, ACDELCO 12706545 and ACDELCO 12691898, plus the other parts above.