2025 Chevrolet Blazer Engine Parts

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

6 Camshaft parts for the 2025 Chevrolet Blazer come from GM GENUINE.

This group includes GM GENUINE 12703359, GM GENUINE 55511463 and GM GENUINE 12677826 and the remaining parts above.

This table covers the seals at each camshaft end. 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

One part is listed for the 2025 Chevrolet Blazer — GM GENUINE 12636316.

This table covers the connecting rods between each piston and the crankshaft. Read more

This group shows a single part: GM GENUINE 12647161.

This table covers the bearings in the connecting-rod big ends. Typical signs include a growl that rises with speed, or play in the shaft or hub. Set preload the way the notes specify. A dry or crushed bearing fails quickly. Read more

This group shows a single part: GM GENUINE 12672032.

This table covers the Connecting Rod bolts. Read more

One part is listed for the 2025 Chevrolet Blazer — GM GENUINE 11519680.

This table covers the Crankcase pressure sensors. Typical signs include a check-engine light for MAP or fuel-rail pressure, or a limp mode under load. A vacuum leak or a clogged reference line will fake a bad pressure sensor. Read more

One part is listed for the 2025 Chevrolet Blazer — GM GENUINE 12740187.

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

This group shows a single part: GM GENUINE 12699162.

This table covers the main bearings that support the crankshaft in the block. Typical signs include a growl that rises with speed, or play in the shaft or hub. Set preload the way the notes specify. A dry or crushed bearing fails quickly. Read more

GM GENUINE supplies the 3 Crankshaft Main Bearing parts for the 2025 Chevrolet Blazer.

Part numbers include GM GENUINE 12744917, GM GENUINE 12720271 and GM GENUINE 12720272.

This table covers the Crankshaft Main Bearing Cap bolts. Read more

4 Crankshaft Main Bearing Cap Bolt parts for the 2025 Chevrolet Blazer come from GM GENUINE.

This group includes GM GENUINE 11588713, GM GENUINE 11546565 and GM GENUINE 11589000 and the remaining parts above.

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

GM GENUINE supplies both parts for the 2025 Chevrolet Blazer.

Listed part numbers: GM GENUINE 12693989 and GM GENUINE 12654010.

This table covers the Crankshaft Seal covers. Read more

This group shows a single part: GM GENUINE 55486914.

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

One part is listed for the 2025 Chevrolet Blazer — GM GENUINE 12729488.

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

4 Cylinder Head Bolt parts for the 2025 Chevrolet Blazer come from GM GENUINE.

Part numbers include GM GENUINE 11603109, GM GENUINE 11548293 and GM GENUINE 11547020, among others listed above.

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 2025 Chevrolet Blazer come from GM GENUINE.

Part numbers include GM GENUINE 55486594, GM GENUINE 12647574 and GM GENUINE 12647575.

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: GM GENUINE 12672033.

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

GM GENUINE supplies both parts for the 2025 Chevrolet Blazer.

Part numbers include GM GENUINE 12586687 and GM GENUINE 12587380.

This table covers the Engine Cover retainers and clips. Read more

One part is listed for the 2025 Chevrolet Blazer — GM GENUINE 11518792.

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

2 Exhaust Valve parts are listed for the 2025 Chevrolet Blazer, from GM GENUINE and MELLING.

Listed part numbers: GM GENUINE 12647868 and MELLING V3468.

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

2 Fuel Pump Camshaft Follower parts for the 2025 Chevrolet Blazer come from GM GENUINE.

This group includes GM GENUINE 12748968 and GM GENUINE 12718357.

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

2 Harmonic Balancer parts for the 2025 Chevrolet Blazer come from GM GENUINE.

Listed part numbers: GM GENUINE 55487414 and GM GENUINE 12700427.

This table covers the Harmonic Balancer bolts. Read more

One part is listed for the 2025 Chevrolet Blazer — GM GENUINE 11546516.

This table covers the Intake insulators. Read more

This group shows a single part: GM GENUINE 12711487.

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

GM GENUINE supplies both parts for the 2025 Chevrolet Blazer.

This group includes GM GENUINE 55515837 and GM GENUINE 12674037.

This table covers the Intake Manifold bolts. Read more

3 Intake Manifold Bolt parts for the 2025 Chevrolet Blazer come from GM GENUINE.

This group includes GM GENUINE 11548171, GM GENUINE 11547321 and GM GENUINE 11547030.

This table covers the Intake Manifold covers. Read more

This group shows a single part: GM GENUINE 12680066.

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 2025 Chevrolet Blazer come from GM GENUINE.

Listed part numbers: GM GENUINE 55488180 and GM GENUINE 12648665.

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

3 Intake Valve parts are listed for the 2025 Chevrolet Blazer, from GM GENUINE, MELLING and SBI.

This group includes GM GENUINE 12647867, MELLING V3467 and SBI 13467.

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

6 Motor Mount parts are listed for the 2025 Chevrolet Blazer, from ANCHOR, GM GENUINE, PIONEER and 1 other brand.

Part numbers include ANCHOR 3526, ANCHOR 3518 and GM GENUINE 84624770, among others listed above.

This table covers the Motor Mount bolts. Read more

2 Motor Mount Bolt parts for the 2025 Chevrolet Blazer come from GM GENUINE.

Part numbers include GM GENUINE 11547918 and GM GENUINE 11588741.

This table covers the Motor Mount Bracket bolts. Read more

This group shows a single part: GM GENUINE 11589279.

This table covers the Motor Mount kits. Read more

ANCHOR supplies the 4 Motor Mount Kit parts for the 2025 Chevrolet Blazer.

Listed part numbers: ANCHOR 300513, ANCHOR 300822 and ANCHOR 300504, plus the other parts above.

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

37 Oil parts are listed for the 2025 Chevrolet Blazer, from MOBIL, LIQUI MOLY, VALVOLINE and 3 other brands. ACDELCO 109302 carries the "Popular" badge. Full Synthetic and High Mileage (>75,000 Miles) are all represented, and Full Synthetic alone accounts for 33 parts.

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

GM GENUINE supplies both parts for the 2025 Chevrolet Blazer.

Listed part numbers: GM GENUINE 55486915 and GM GENUINE 12662732.

This table covers the Oil Cooler 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

GM GENUINE supplies the 4 Oil Cooler Line parts for the 2025 Chevrolet Blazer.

Part numbers include GM GENUINE 90572594, GM GENUINE 55505201 and GM GENUINE 11611503, among others listed above.

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

2 Oil Cooler Seal parts for the 2025 Chevrolet Blazer come from 2 brands — ACDELCO and GM GENUINE.

Part numbers include ACDELCO 55488933 and GM GENUINE 12733672.

This table covers the Oil Dipstick tubes. Read more

GM GENUINE supplies both parts for the 2025 Chevrolet Blazer.

Part numbers include GM GENUINE 12666871 and GM GENUINE 12672635.

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

2 Oil Dipstick / Tube Seal parts for the 2025 Chevrolet Blazer come from GM GENUINE.

Listed part numbers: GM GENUINE 24504031 and GM GENUINE 12670252.

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

6 Oil Drain Plug parts are listed for the 2025 Chevrolet Blazer, from DORMAN and GM GENUINE.

Part numbers include DORMAN 090854CD, DORMAN 090854 and DORMAN 090948CD, among others listed above.

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 2025 Chevrolet Blazer come from GM GENUINE.

Listed part numbers: GM GENUINE 12667457 and GM GENUINE 12616850.

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

3 Oil Filler Cap parts are listed for the 2025 Chevrolet Blazer, from ACDELCO and MOTORAD.

This group includes ACDELCO FC275, ACDELCO FC268 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 Filler tubes. Read more

One part is listed for the 2025 Chevrolet Blazer — GM GENUINE 12686973.

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

19 Oil Filter parts are listed for the 2025 Chevrolet Blazer, from WIX, ACDELCO, FVP and 7 other brands. MOBIL M1212A carries the "Popular" badge.

In the Economy grade, FVP, PRO-TEC, VARIOUS MFR and 3 other brands supply 9 parts: the catalog's value-priced group. A representative part number is CHAMP / LUBER-FINER PH1500.

In the High Performance / Heavy Duty grade, MOBIL and WIX supply 3 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 MOBIL M1212A.

The Standard Replacement section lists 7 options from ACDELCO, WIX and HASTINGS / BALDWIN — built to original-equipment specification. ACDELCO PF66 is listed in this group.

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

GM GENUINE supplies the 4 Oil Galley Plug parts for the 2025 Chevrolet Blazer.

This group includes GM GENUINE 11570754, GM GENUINE 11562126 and GM GENUINE 09427693 and the remaining parts above.

This table covers the Oil Level 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 2025 Chevrolet Blazer — GM GENUINE 12696433.

This table covers the Oil Level Sensor 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

One part is listed for the 2025 Chevrolet Blazer — GM GENUINE 12638820.

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

5 Oil Pan parts for the 2025 Chevrolet Blazer come from 3 brands — DORMAN, GM GENUINE and SPECTRA PREMIUM.

Listed part numbers: DORMAN 266031, DORMAN 264884 and GM GENUINE 12717172, plus the other parts above.

This table covers the Oil Pan bolts. Read more

GM GENUINE supplies the 4 Oil Pan Bolt parts for the 2025 Chevrolet Blazer.

Listed part numbers: GM GENUINE 11588726, GM GENUINE 11588725 and GM GENUINE 11588694, plus the other parts above.

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

One part is listed for the 2025 Chevrolet Blazer — GM GENUINE 12647081.

This table covers the Oil Pressure Relief Valve 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 2025 Chevrolet Blazer — GM GENUINE 11570754.

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

GM GENUINE supplies the 3 Oil Pump parts for the 2025 Chevrolet Blazer.

Listed part numbers: GM GENUINE 55509155, GM GENUINE 12741330 and GM GENUINE 12741263.

This table covers the Oil Pump bolts. Read more

This group shows a single part: GM GENUINE 11548002.

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

This group shows a single part: GM GENUINE 12694716.

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

2 Oil Pump Control Valve / Solenoid parts for the 2025 Chevrolet Blazer come from GM GENUINE.

This group includes GM GENUINE 12740050 and GM GENUINE 12741262.

This table covers the gaskets that seal the Oil Pump. 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 55500219.

This table covers the gaskets that seal the Oil Pump Pickup Tube. 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 12637179.

This table covers the Oil Pump sprockets. Read more

This group shows a single part: GM GENUINE 12669395.

This table covers the Oil Temperature senders. Read more

This group shows a single part: GM GENUINE 55494665.

This table covers the pistons that travel in each cylinder. Typical signs include knock, blow-by, or a cylinder that will not hold compression. Piston work is a short-block job. Match bore, pin and ring pack in the notes — not the photo. Read more

2 Piston parts for the 2025 Chevrolet Blazer come from GM GENUINE.

Listed part numbers: GM GENUINE 12674055 and GM GENUINE 12674056.

This table covers the Piston Pin retainers. Read more

One part is listed for the 2025 Chevrolet Blazer — GM GENUINE 12647160.

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

3 Piston Ring parts for the 2025 Chevrolet Blazer come from 2 brands — GM GENUINE and HASTINGS MANUFACTURING.

Part numbers include GM GENUINE 12720003, GM GENUINE 12705385 and HASTINGS MANUFACTURING 2N5670.

This table covers the rocker arms that transfer cam motion to the valves. Read more

6 Rocker Arm parts are listed for the 2025 Chevrolet Blazer, from GM GENUINE and SKP.

Part numbers include GM GENUINE 12739173, GM GENUINE 12731971 and GM GENUINE 12654646, among others listed above.

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 2025 Chevrolet Blazer come from GM GENUINE.

This group includes GM GENUINE 55514729 and GM GENUINE 12647895.

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

One part is listed for the 2025 Chevrolet Blazer — GM GENUINE 12713649.

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

5 Timing Chain Guide / Damper parts for the 2025 Chevrolet Blazer come from GM GENUINE. The "Popular" part is GM GENUINE 11547061.

Listed part numbers: GM GENUINE 11547061, GM GENUINE 11561619 and GM GENUINE 12741313, plus the other parts above.