2021 Chevrolet Blazer Engine Parts

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

5 Balance Shaft Chain parts for the 2021 Chevrolet Blazer come from 4 brands — MELLING, GM GENUINE, PREFERRED COMPONENTS INC and 1 other brand.

In the Chain Only grade, GM GENUINE, MELLING and PREFERRED COMPONENTS INC supply 3 parts: grouped under the catalog's "Chain Only" designation — the notes column spells out what sets them apart. A representative part number is GM GENUINE 12626983.

The Kit section lists 1 option from MELLING — grouped under the catalog's "Kit" designation — the notes column spells out what sets them apart. MELLING 31094S is listed in this group.

1 further part sits outside the graded sections, with the same engine-level match.

Listed part numbers: GM GENUINE 12626983, MELLING 1094 and PREFERRED COMPONENTS INC C766C, plus the other parts above.

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

4 Balance Shaft Chain Guide parts for the 2021 Chevrolet Blazer come from 4 brands — GM GENUINE, MELLING, PREFERRED COMPONENTS INC and 1 other brand.

Listed part numbers: GM GENUINE 12655471, MELLING BG5150 and PREFERRED COMPONENTS INC R76248, plus the other parts above.

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

4 Balance Shaft Chain Tensioner parts are listed for the 2021 Chevrolet Blazer, from GM GENUINE, MELLING, PREFERRED COMPONENTS INC and 1 other brand.

This group includes GM GENUINE 12626984, MELLING BT5208 and PREFERRED COMPONENTS INC T66206 and the remaining parts above.

This table covers the Balance Shaft sprockets. Read more

4 Balance Shaft Sprocket parts for the 2021 Chevrolet Blazer come from 4 brands — GM GENUINE, MELLING, PREFERRED COMPONENTS INC and 1 other brand.

This group includes GM GENUINE 12655716, MELLING S1370 and PREFERRED COMPONENTS INC G56384 and the remaining parts above.

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

9 Camshaft parts for the 2021 Chevrolet Blazer come from GM GENUINE.

Listed part numbers: GM GENUINE 12703359, GM GENUINE 55511463 and GM GENUINE 12638651, plus the other parts above.

This table covers the Camshaft Alignment 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 Chevrolet Blazer — LISLE 37530.

This table covers the Camshaft bolts. Read more

One part is listed for the 2021 Chevrolet Blazer — GM GENUINE 12740203.

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

GM GENUINE supplies both parts for the 2021 Chevrolet Blazer.

Part numbers include GM GENUINE 12574477 and GM GENUINE 12636316.

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

2 Connecting Rod parts for the 2021 Chevrolet Blazer come from GM GENUINE.

This group includes GM GENUINE 12674412 and 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

3 Connecting Rod Bearing parts for the 2021 Chevrolet Blazer come from 2 brands — GM GENUINE and MAHLE / CLEVITE.

Listed part numbers: GM GENUINE 12668645, GM GENUINE 12672032 and MAHLE / CLEVITE CB2033A.

This table covers the Connecting Rod bolts. Read more

GM GENUINE supplies both parts for the 2021 Chevrolet Blazer.

Listed part numbers: GM GENUINE 11548927 and GM GENUINE 11519680.

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

3 Conversion / Lower Gasket Set parts for the 2021 Chevrolet Blazer come from AJUSA.

Listed part numbers: AJUSA 54324400, AJUSA 54229400 and AJUSA 54323100.

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 2021 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 4 Crankshaft Main Bearing parts for the 2021 Chevrolet Blazer.

Listed part numbers: GM GENUINE 12668646, GM GENUINE 12744917 and GM GENUINE 12720271, plus the other parts above.

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

6 Crankshaft Main Bearing Cap Bolt parts for the 2021 Chevrolet Blazer come from 2 brands — GM GENUINE and ELRING. The "Popular" part is GM GENUINE 11588713. 1 part fits every engine; the other 5 are engine-specific.

This group includes GM GENUINE 11588713, GM GENUINE 11546565 and ELRING B75610 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

16 Crankshaft Seal parts are listed for the 2021 Chevrolet Blazer, from AJUSA, GM GENUINE, ELRING and 5 other brands. GM GENUINE 12626923 carries the "Popular" badge.

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 2021 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

10 Cylinder Head Bolt parts for the 2021 Chevrolet Blazer come from 3 brands — GM GENUINE, AJUSA and FEL-PRO. The "Popular" part is GM GENUINE 11547020. 1 part fits every engine; the other 9 are engine-specific.

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

15 Cylinder Head Gasket parts for the 2021 Chevrolet Blazer come from 4 brands — GM GENUINE, AJUSA, FEL-PRO and 1 other brand. The "Popular" part is GM GENUINE 12647574.

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

9 Cylinder Head Gasket Set parts for the 2021 Chevrolet Blazer come from 4 brands — AJUSA, ELRING, GM GENUINE and 1 other brand.

Part numbers include AJUSA 52618900, AJUSA 52606000 and AJUSA 52613900, among others listed above.

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 2021 Chevrolet Blazer.

This group includes GM GENUINE 12586687 and GM GENUINE 12587380.

This table covers the Engine Cover grommets. Read more

One part is listed for the 2021 Chevrolet Blazer — GM GENUINE 12737359.

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

One part is listed for the 2021 Chevrolet Blazer — GM GENUINE 11518792.

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

3 Engine Kit Gasket Set parts for the 2021 Chevrolet Blazer come from AJUSA.

This group includes AJUSA 50554900, AJUSA 50548800 and AJUSA 50552200.

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

8 Exhaust Valve parts are listed for the 2021 Chevrolet Blazer, from GM GENUINE, MELLING, QUALCAST and 1 other brand.

Listed part numbers: GM GENUINE 12627156, GM GENUINE 12647868 and MELLING V3442, plus the other parts above.

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

5 Harmonic Balancer parts for the 2021 Chevrolet Blazer come from 3 brands — GM GENUINE, SKP and ATP.

The Economy section lists 1 option from SKP — the catalog's value-priced group. SKP SK55487414 is listed in this group.

In the Standard Replacement grade, GM GENUINE supplies 1 part: built to original-equipment specification. A representative part number is GM GENUINE 55487414.

3 further parts sit outside the graded sections, with the same engine-level match.

This group includes SKP SK55487414, GM GENUINE 55487414 and ATP 102479 and the remaining parts above.

This table covers the Harmonic Balancer bolts. Read more

GM GENUINE supplies both parts for the 2021 Chevrolet Blazer.

Listed part numbers: GM GENUINE 12557840 and 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

4 Intake Manifold parts are listed for the 2021 Chevrolet Blazer, from GM GENUINE and VAICO.

Listed part numbers: GM GENUINE 55515837, GM GENUINE 12646130 and GM GENUINE 12674037, plus the other parts above.

This table covers the Intake Manifold bolts. Read more

4 Intake Manifold Bolt parts for the 2021 Chevrolet Blazer come from GM GENUINE.

This group includes GM GENUINE 11548171, GM GENUINE 11588352 and GM GENUINE 11547321 and the remaining parts above.

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

11 Intake Manifold Gasket parts for the 2021 Chevrolet Blazer come from 5 brands — GM GENUINE, AJUSA, FEL-PRO and 2 other brands. The "Popular" part is 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

7 Intake Valve parts are listed for the 2021 Chevrolet Blazer, from GM GENUINE, MELLING, QUALCAST and 1 other brand.

This group includes GM GENUINE 12662527, GM GENUINE 12647867 and MELLING V3441 and the remaining parts above.

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

10 Motor Mount parts are listed for the 2021 Chevrolet Blazer, from GM GENUINE, ANCHOR, DEA / MARMON RIDE CONTROL and 2 other brands. GM GENUINE 84624770 carries the "Popular" badge.

This table covers the Motor Mount bolts. Read more

2 Motor Mount Bolt parts for the 2021 Chevrolet Blazer come from GM GENUINE. Every part fits all 3 engine options (2.0L L4 Turbocharged, 2.5L L4 and 3.6L V6).

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 2021 Chevrolet Blazer.

This group includes ANCHOR 300513, ANCHOR 300822 and ANCHOR 300504 and the remaining 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

40 Oil parts are listed for the 2021 Chevrolet Blazer, from LIQUI MOLY, MOBIL, 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 36 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

3 Oil Cooler parts are listed for the 2021 Chevrolet Blazer, from GM GENUINE and STANDARD MOTOR PRODUCTS.

Part numbers include GM GENUINE 55486915, GM GENUINE 12662732 and STANDARD MOTOR PRODUCTS OCK135.

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

4 Oil Cooler Gasket parts for the 2021 Chevrolet Blazer come from ELRING.

This group includes ELRING 815560, ELRING 074570 and ELRING 112790 and the remaining parts above.

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 2021 Chevrolet Blazer.

Listed part numbers: GM GENUINE 90572594, GM GENUINE 55505201 and GM GENUINE 11611503, plus the other parts 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 2021 Chevrolet Blazer come from 2 brands — ACDELCO and GM GENUINE.

This group includes ACDELCO 55488933 and GM GENUINE 12733672.