2024 Lexus GX550 Engine Parts

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

One part is listed for the 2024 Lexus GX550 — AJUSA 54339300.

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

2 Crankshaft Seal parts for the 2024 Lexus GX550 come from AJUSA.

Part numbers include AJUSA 15121200 and AJUSA 15121800.

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

One part is listed for the 2024 Lexus GX550 — AJUSA 81078600.

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

AJUSA supplies the 4 Cylinder Head Gasket parts for the 2024 Lexus GX550.

Part numbers include AJUSA 10250900, AJUSA 10251000 and AJUSA 52683900, among others listed above.

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

One part is listed for the 2024 Lexus GX550 — AJUSA 52683800.

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

One part is listed for the 2024 Lexus GX550 — AJUSA 50605100.

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

One part is listed for the 2024 Lexus GX550 — AJUSA 13316100.

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

32 Oil parts for the 2024 Lexus GX550 come from 5 brands — VALVOLINE, MOBIL, IDEMITSU and 2 other brands. The "Popular" part is LIQUI MOLY 2208. Grades run from Full Synthetic through High Mileage (>75,000 Miles); Full Synthetic is the most populated section, led by IDEMITSU, VALVOLINE, LIQUI MOLY and 2 other brands.

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

3 Oil Drain Plug parts for the 2024 Lexus GX550 come from 2 brands — DORMAN and REIN.

Listed part numbers: DORMAN 090038, DORMAN 090049 and REIN HWU0112.

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 are listed for the 2024 Lexus GX550, from AJUSA and DORMAN.

Listed part numbers: AJUSA 22005800 and DORMAN 095156.

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

3 Oil Filler Cap parts for the 2024 Lexus GX550 come from 3 brands — CALORSTAT, GATES and MOTORAD.

This group includes CALORSTAT OC2312, GATES 31285 and MOTORAD MO155.

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

10 Oil Filter parts for the 2024 Lexus GX550 come from 7 brands — FRAM, VARIOUS MFR, WIX and 4 other brands. The "Popular" part is MOBIL M1103A.

The Economy section lists 5 options from FRAM, FVP, PRO-TEC and 1 other brand — the catalog's value-priced group. FRAM FF4386 is listed in this group.

The High Performance / Heavy Duty section lists 2 options from MOBIL and WIX — grouped under the catalog's "High Performance / Heavy Duty" designation — the notes column spells out what sets them apart. MOBIL M1103A is listed in this group.

In the Standard Replacement grade, ACDELCO, VARIOUS MFR and WIX supply 3 parts: built to original-equipment specification. A representative part number is ACDELCO PF1233.

This table covers the chains that drive the oil pump. Read more

2 Oil Pump Chain parts are listed for the 2024 Lexus GX550, from MELLING and S.A. GEAR.

Part numbers include MELLING 1108 and S.A. GEAR C1266.

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

4 Timing Chain parts are listed for the 2024 Lexus GX550, from MELLING and S.A. GEAR.

Part numbers include MELLING 1106, MELLING 1107 and S.A. GEAR C1265, among others listed above.

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

4 Timing Chain & Component Kit parts for the 2024 Lexus GX550 come from 3 brands — S.A. GEAR, JAPANESE OE and MELLING.

The Economy section: 2 options from S.A. GEAR. S.A. GEAR 76484S is listed in this group.

Standard Replacement: 2 parts, from JAPANESE OE and MELLING. A representative part number is JAPANESE OE A05910AMK.

Part numbers include S.A. GEAR 76484S, S.A. GEAR 76484 and JAPANESE OE A05910AMK, among others listed above.

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

7 Timing Chain Guide / Damper parts are listed for the 2024 Lexus GX550, from S.A. GEAR and MELLING.

Part numbers include MELLING BG7068, MELLING BG7069 and MELLING BT7087, among others listed above.

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

7 Timing Chain Tensioner parts for the 2024 Lexus GX550 come from 2 brands — MELLING and S.A. GEAR.

Part numbers include MELLING BT7083, MELLING BT7084 and MELLING BT7085, among others listed above.

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

2 Timing Crank Sprocket parts for the 2024 Lexus GX550 come from S.A. GEAR.

This group includes S.A. GEAR S1562 and S.A. GEAR S1561.

This table covers the Timing Idler sprockets. Read more

One part is listed for the 2024 Lexus GX550 — S.A. GEAR S1563.

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

One part is listed for the 2024 Lexus GX550 — WELLS 5S15758.

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

AJUSA supplies both parts for the 2024 Lexus GX550.

Part numbers include AJUSA JTC12879 and AJUSA JTC12880.

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

2 Turbocharger Oil Line parts for the 2024 Lexus GX550 come from AJUSA.

Listed part numbers: AJUSA OP11438 and AJUSA OP11440.

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 for the 2024 Lexus GX550 come from AJUSA.

Listed part numbers: AJUSA 56097600 and AJUSA 56097700.

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

This group shows a single part: AJUSA 85022700.

This table covers the Valve Spring retainers. Read more

One part is listed for the 2024 Lexus GX550 — MELLING VSR726.

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

One part is listed for the 2024 Lexus GX550 — MELLING VL1100.

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

3 Valve Stem Seal parts for the 2024 Lexus GX550 come from AJUSA.

Listed part numbers: AJUSA 12027100, AJUSA 12036100 and AJUSA 57089800.

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

This group shows a single part: WELLS 2T1306.