2021 Chevrolet Express 2500 Engine Parts

This table covers the Balance shafts. Read more

This group shows a single part: GM GENUINE 12653449.

This table covers the Balance Shaft bearings. 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

2 Balance Shaft Bearing parts for the 2021 Chevrolet Express 2500 come from GM GENUINE.

Listed part numbers: GM GENUINE 12629467 and GM GENUINE 12629468.

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

7 Balance Shaft Chain parts are listed for the 2021 Chevrolet Express 2500, from S.A. GEAR, CLOYES, GM GENUINE and 1 other brand. CLOYES C927 carries the "Popular" badge.

This group includes CLOYES C927, GM GENUINE 12632727 and MELLING 1089 and the remaining parts above.

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

3 Balance Shaft Chain Guide parts are listed for the 2021 Chevrolet Express 2500, from CLOYES, GM GENUINE and S.A. GEAR.

This group includes CLOYES 95976, GM GENUINE 12632728 and S.A. GEAR 71285.

This table covers the Balance Shaft sprockets. Read more

4 Balance Shaft Sprocket parts are listed for the 2021 Chevrolet Express 2500, from GM GENUINE, CLOYES and S.A. GEAR.

Listed part numbers: CLOYES S1110, GM GENUINE 12690616 and GM GENUINE 12632725, plus the other parts above.

This table covers the Barometric 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 Express 2500 — GM GENUINE 12711681.

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

7 Camshaft parts are listed for the 2021 Chevrolet Express 2500, from GM GENUINE, MELLING and ENGINETECH.

Part numbers include ENGINETECH ES1435, GM GENUINE 12642853 and GM GENUINE 12646602, among others listed above.

This table covers the Camshaft bearings. 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 both parts for the 2021 Chevrolet Express 2500.

This group includes GM GENUINE 12686894 and GM GENUINE 12679049.

This table covers the Camshaft bolts. Read more

2 Camshaft Bolt parts for the 2021 Chevrolet Express 2500 come from 2 brands — ELRING and GM GENUINE.

This group includes ELRING 857390 and GM GENUINE 11561455.

This table covers the Camshaft Dowel pins. Read more

One part is listed for the 2021 Chevrolet Express 2500 — GM GENUINE 24575061.

This table covers the Camshaft 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 Chevrolet Express 2500 — GM GENUINE 12643564.

This table covers the Camshaft Retainer / Thrust plates. Typical signs include warpage, cracks, or a plate that no longer locates the assembly. Confirm which plate the notes describe — backing plates, clutch plates and strike plates are different parts. Read more

4 Camshaft Retainer / Thrust Plate parts for the 2021 Chevrolet Express 2500 come from 4 brands — DORMAN, FEL-PRO, GM GENUINE and 1 other brand. 1 part fits every engine; the other 3 are engine-specific.

This group includes DORMAN 45745, FEL-PRO ES73115 and GM GENUINE 12589016 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

4 Camshaft Seal parts for the 2021 Chevrolet Express 2500 come from 3 brands — AJUSA, GM GENUINE and MAHLE / CLEVITE. 1 part fits every engine; the other 3 are engine-specific.

Part numbers include AJUSA 15092300, AJUSA 01713900 and GM GENUINE 12643563, among others listed above.

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

GM GENUINE supplies both parts for the 2021 Chevrolet Express 2500.

Part numbers include GM GENUINE 12625458 and GM GENUINE 12648238.

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

GM GENUINE supplies the 6 Connecting Rod Bearing parts for the 2021 Chevrolet Express 2500.

This group includes GM GENUINE 12625481, GM GENUINE 12625468 and GM GENUINE 12625222 and the remaining parts above.

This table covers the Connecting Rod bolts. Read more

3 Connecting Rod Bolt parts for the 2021 Chevrolet Express 2500 come from GM GENUINE. Every part fits all 3 engine options (2.8L L4 DIESEL Turbocharged, 4.3L V6 and 6.6L V8).

Part numbers include GM GENUINE 11548432, GM GENUINE 12625461 and GM GENUINE 11570662.

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

AJUSA supplies the 3 Conversion / Lower Gasket Set parts for the 2021 Chevrolet Express 2500.

Part numbers include AJUSA 54342300, AJUSA 54323400 and AJUSA 54290100.

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

GM GENUINE supplies both parts for the 2021 Chevrolet Express 2500.

Part numbers include GM GENUINE 24590075 and GM GENUINE 12708884.

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

8 Crankshaft Main Bearing parts for the 2021 Chevrolet Express 2500 come from GM GENUINE. The "Popular" part is GM GENUINE 12625399.

Listed part numbers: GM GENUINE 12625399, GM GENUINE 12625397 and GM GENUINE 12625398, plus the other parts above.

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

GM GENUINE supplies the 3 Crankshaft Main Bearing Cap Bolt parts for the 2021 Chevrolet Express 2500.

This group includes GM GENUINE 11546565, GM GENUINE 11548076 and GM GENUINE 11548075.

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

10 Crankshaft Seal parts for the 2021 Chevrolet Express 2500 come from 4 brands — GM GENUINE, FEL-PRO, AJUSA and 1 other brand. The "Popular" part is FEL-PRO BS40765. 1 part fits every engine; the other 9 are engine-specific.

This table covers the Crankshaft Seal covers. Read more

4 Crankshaft Seal Cover parts are listed for the 2021 Chevrolet Express 2500, from GM GENUINE and DORMAN.

Listed part numbers: DORMAN 635786, GM GENUINE 55484756 and GM GENUINE 12705663, plus the other parts above.

This table covers the gaskets that seal the Crankshaft Seal. 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 2021 Chevrolet Express 2500 — GM GENUINE 12627520.

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

This group shows a single part: GM GENUINE 12677840.

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

One part is listed for the 2021 Chevrolet Express 2500 — GM GENUINE 12570326.

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

9 Cylinder Head Bolt parts are listed for the 2021 Chevrolet Express 2500, from GM GENUINE, FEL-PRO, MAHLE / CLEVITE and 2 other brands. GM GENUINE 11546959 carries the "Popular" badge. 2 parts fit every engine; the other 7 are engine-specific.

This group includes GM GENUINE 11546959, AJUSA 81044300 and ARP 2304203 and the remaining parts 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

19 Cylinder Head Gasket parts are listed for the 2021 Chevrolet Express 2500, from AJUSA, GM GENUINE, MAHLE / CLEVITE and 4 other brands. APEX AHG1448 carries the "Popular" badge.

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

6 Cylinder Head Gasket Set parts are listed for the 2021 Chevrolet Express 2500, from AJUSA, MAHLE / CLEVITE and ENGINETECH.

Part numbers include AJUSA 53110400, AJUSA 52614600 and AJUSA 52582800, among others listed above.

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

2 Cylinder Head Plug parts for the 2021 Chevrolet Express 2500 come from GM GENUINE.

Part numbers include GM GENUINE 11602951 and GM GENUINE 24502262.

This table covers the Engine Block drain plugs. Read more

GM GENUINE supplies both parts for the 2021 Chevrolet Express 2500.

Part numbers include GM GENUINE 11602951 and GM GENUINE 11546667.

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

3 Engine Block Heater parts for the 2021 Chevrolet Express 2500 come from GM GENUINE.

Listed part numbers: GM GENUINE 55503649, GM GENUINE 19130016 and GM GENUINE 12586687.

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

This group shows a single part: GM GENUINE 11588327.

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

AJUSA supplies the 3 Engine Kit Gasket Set parts for the 2021 Chevrolet Express 2500.

Part numbers include AJUSA 51114800, AJUSA 50552500 and AJUSA 50530700.

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

7 Exhaust Valve parts for the 2021 Chevrolet Express 2500 come from 4 brands — GM GENUINE, MELLING, QUALCAST and 1 other brand.

This group includes GM GENUINE 12625566, GM GENUINE 12678745 and GM GENUINE 12733470 and the remaining parts above.

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

GM GENUINE supplies both parts for the 2021 Chevrolet Express 2500.

Listed part numbers: GM GENUINE 12625430 and GM GENUINE 12680364.

This table covers the Harmonic Balancer bolts. Read more

3 Harmonic Balancer Bolt parts for the 2021 Chevrolet Express 2500 come from 2 brands — GM GENUINE and FEL-PRO. 1 part fits every engine; the other 2 are engine-specific.

Listed part numbers: FEL-PRO 73372, GM GENUINE 11515756 and GM GENUINE 11547372.

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

2 Intake Manifold parts for the 2021 Chevrolet Express 2500 come from GM GENUINE.

Part numbers include GM GENUINE 55598784 and GM GENUINE 12748174.

This table covers the Intake Manifold bolts. Read more

One part is listed for the 2021 Chevrolet Express 2500 — GM GENUINE 11610472.

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

12 Intake Manifold Gasket parts are listed for the 2021 Chevrolet Express 2500, from GM GENUINE, MAHLE / CLEVITE, FEL-PRO and 1 other brand. GM GENUINE 12626354 carries the "Popular" badge.

This table covers the gaskets that seal the Intake Plenum. 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: AJUSA 01600000.

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

6 Intake Valve parts for the 2021 Chevrolet Express 2500 come from 5 brands — MELLING, GM GENUINE, ENGINETECH and 2 other brands. The "Popular" part is GM GENUINE 12619825.

This group includes GM GENUINE 12619825 and ENGINETECH V3432 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

16 Motor Mount parts for the 2021 Chevrolet Express 2500 come from 4 brands — ANCHOR, GM GENUINE, DEA / MARMON RIDE CONTROL and 1 other brand. The "Popular" part is ANCHOR 3349.

This table covers the Motor Mount bolts. Read more

GM GENUINE supplies the 3 Motor Mount Bolt parts for the 2021 Chevrolet Express 2500. All of them fit every engine offered in the 2021 Express 2500.

This group includes GM GENUINE 11588740, GM GENUINE 11515775 and GM GENUINE 11517706.

This table covers the Motor Mount Bracket bolts. Read more

One part is listed for the 2021 Chevrolet Express 2500 — GM GENUINE 11515775.

This table covers the Motor Mount kits. Read more

2 Motor Mount Kit parts for the 2021 Chevrolet Express 2500 come from ANCHOR.

This group includes ANCHOR 301160 and ANCHOR 301098.

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

35 Oil parts for the 2021 Chevrolet Express 2500 come from 6 brands — LIQUI MOLY, LUCAS OIL, MOBIL and 3 other brands. The "Popular" part is ACDELCO 109324. Grades run from Full Synthetic through High Mileage (>75,000 Miles); Full Synthetic is the most populated section, led by LIQUI MOLY, MOBIL, VALVOLINE and 3 other brands.

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

This group shows a single part: STANDARD MOTOR PRODUCTS OCK11.

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

6 Oil Cooler Gasket parts are listed for the 2021 Chevrolet Express 2500, from FEL-PRO, GM GENUINE, DORMAN and 1 other brand. 1 part fits every engine; the other 5 are engine-specific.

Listed part numbers: DORMAN 66219, FEL-PRO 71868 and FEL-PRO 73212, plus the other parts above.

This table covers the Oil Cooler Hose pipes. Read more

3 Oil Cooler Hose / Pipe parts for the 2021 Chevrolet Express 2500 come from 2 brands — GM GENUINE and ACDELCO.

This group includes ACDELCO 84175177, GM GENUINE 55484647 and GM GENUINE 24585349.

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

3 Oil Cooler Line parts for the 2021 Chevrolet Express 2500 come from GM GENUINE.

This group includes GM GENUINE 84994161, GM GENUINE 84906732 and GM GENUINE 85626951.

This table covers the harness connectors at the Oil Cooler Line. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock. Read more

GM GENUINE supplies both parts for the 2021 Chevrolet Express 2500.

This group includes GM GENUINE 23378668 and GM GENUINE 84240291.

This table covers the Oil Dipstick tubes. Read more

7 Oil Dipstick / Tube parts for the 2021 Chevrolet Express 2500 come from GM GENUINE.

This group includes GM GENUINE 24585519, GM GENUINE 12678819 and GM GENUINE 12678814 and the remaining 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 are listed for the 2021 Chevrolet Express 2500, from GM GENUINE and FEL-PRO. 2 parts fit every engine; the other 1 is engine-specific.

Listed part numbers: FEL-PRO 73889, GM GENUINE 24504031 and GM GENUINE 12625704.