2021 Chevrolet Silverado 6500 HD Engine Parts

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

This group shows a single part: GM GENUINE 12633925.

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

3 Camshaft Bearing parts for the 2021 Chevrolet Silverado 6500 HD come from 2 brands — GM GENUINE and MAHLE / CLEVITE.

This group includes GM GENUINE 12631285, GM GENUINE 12631286 and MAHLE / CLEVITE SH1999S.

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

One part is listed for the 2021 Chevrolet Silverado 6500 HD — DORMAN 45745.

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

This group shows a single part: GM GENUINE 12683616.

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

5 Connecting Rod Bearing parts for the 2021 Chevrolet Silverado 6500 HD come from 2 brands — MAHLE / CLEVITE and GM GENUINE. The "Popular" part is GM GENUINE 12685817.

The High Performance section lists 2 options from MAHLE / CLEVITE — engineered beyond original-equipment specification. MAHLE / CLEVITE CB2030F is listed in this group.

In the Standard Replacement grade, MAHLE / CLEVITE and GM GENUINE supply 3 parts: built to original-equipment specification. A representative part number is GM GENUINE 12685817.

This group includes GM GENUINE 12685817, MAHLE / CLEVITE CB2030F and MAHLE / CLEVITE CB2030FX and the remaining parts above.

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

This group shows a single part: GM GENUINE 12677566.

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

One part is listed for the 2021 Chevrolet Silverado 6500 HD — GM GENUINE 12704537.

This table covers the Crankshaft Main Bearing caps. Typical signs include a leak at the neck, a cap that will not hold pressure, or a missing tether. Match the pressure rating or thread in the notes — radiator, reservoir and fuel caps are not interchangeable. Read more

One part is listed for the 2021 Chevrolet Silverado 6500 HD — GM GENUINE 12686745.

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

This group shows a single part: GM GENUINE 11610683.

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 2021 Chevrolet Silverado 6500 HD.

This group includes GM GENUINE 29606 and GM GENUINE 97209342.

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

One part is listed for the 2021 Chevrolet Silverado 6500 HD — GM GENUINE 12716846.

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

4 Cylinder Head Gasket parts for the 2021 Chevrolet Silverado 6500 HD come from GM GENUINE.

This group includes GM GENUINE 12747434, GM GENUINE 12747435 and GM GENUINE 12747436 and the remaining parts above.

This table covers the Engine Block drain plugs. Read more

2 Engine Block Drain Plug parts for the 2021 Chevrolet Silverado 6500 HD come from GM GENUINE.

This group includes GM GENUINE 11588468 and GM GENUINE 94399639.

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

One part is listed for the 2021 Chevrolet Silverado 6500 HD — GM GENUINE 12742345.

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

One part is listed for the 2021 Chevrolet Silverado 6500 HD — GM GENUINE 11588327.

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

3 Exhaust Valve parts are listed for the 2021 Chevrolet Silverado 6500 HD, from GM GENUINE, QUALCAST and SBI.

This group includes GM GENUINE 12730002, QUALCAST 10VKGMD66A5 and SBI 13470.

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

3 Harmonic Balancer parts for the 2021 Chevrolet Silverado 6500 HD come from 2 brands — GM GENUINE and SKP.

The Economy section lists 1 option from SKP — the catalog's value-priced group. SKP SK12723412 is listed in this group.

Standard Replacement: 2 parts, from GM GENUINE. A representative part number is GM GENUINE 12692644.

This group includes SKP SK12723412, GM GENUINE 12692644 and GM GENUINE 12723412.

This table covers the Harmonic Balancer bolts. Read more

GM GENUINE supplies both parts for the 2021 Chevrolet Silverado 6500 HD.

Listed part numbers: GM GENUINE 11589168 and GM GENUINE 97329601.

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 the 3 Intake Manifold parts for the 2021 Chevrolet Silverado 6500 HD.

This group includes GM GENUINE 12702671, GM GENUINE 12716585 and GM GENUINE 12717925.

This table covers the Intake Manifold bolts. Read more

This group shows a single part: GM GENUINE 11588714.

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

This group shows a single part: GM GENUINE 12642410.

This table covers the Intake Manifold nuts. Read more

This group shows a single part: GM GENUINE 11610091.

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 Chevrolet Silverado 6500 HD — SBI 13469.

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 both parts for the 2021 Chevrolet Silverado 6500 HD.

Part numbers include GM GENUINE 84452325 and GM GENUINE 84452326.

This table covers the brackets that mount the Motor Mount. Typical signs include a cracked mount, a rattle, or a bracket that no longer holds alignment. Confirm position in the notes. Many brackets look alike and bolt to different corners. Read more

GM GENUINE supplies both parts for the 2021 Chevrolet Silverado 6500 HD.

Part numbers include GM GENUINE 19402038 and GM GENUINE 19402040.

This table covers the Motor Mount Bracket bolts. Read more

This group shows a single part: GM GENUINE 19404712.

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

VALVOLINE supplies the 4 Oil parts for the 2021 Chevrolet Silverado 6500 HD.

In the Full Synthetic grade, VALVOLINE supplies 1 part: full-synthetic oils. A representative part number is VALVOLINE 909772.

In the Heavy Duty / Diesel grade, VALVOLINE supplies 1 part: grouped under the catalog's "Heavy Duty / Diesel" designation — the notes column spells out what sets them apart. A representative part number is VALVOLINE 909778.

In the Synthetic Blend grade, VALVOLINE supplies 2 parts: synthetic-blend oils. A representative part number is VALVOLINE 909766.

This group includes VALVOLINE 909772, VALVOLINE 909778 and VALVOLINE 909766 and the remaining parts above.

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

One part is listed for the 2021 Chevrolet Silverado 6500 HD — GM GENUINE 12684475.

This table covers the seals at the Oil Cooler Adapter. 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 Silverado 6500 HD.

This group includes GM GENUINE 12647254 and GM GENUINE 12709792.

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

3 Oil Cooler Gasket parts for the 2021 Chevrolet Silverado 6500 HD come from GM GENUINE.

This group includes GM GENUINE 12665548, GM GENUINE 12640849 and GM GENUINE 12640850.

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

2 Oil Cooler Line Connector parts for the 2021 Chevrolet Silverado 6500 HD come from GM GENUINE.

Part numbers include GM GENUINE 11588733 and GM GENUINE 11515760.

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 Silverado 6500 HD come from GM GENUINE.

Listed part numbers: GM GENUINE 97216175 and GM GENUINE 12631281.

This table covers the Oil Dipstick tubes. Read more

One part is listed for the 2021 Chevrolet Silverado 6500 HD — GM GENUINE 12736677.

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 2021 Chevrolet Silverado 6500 HD come from GM GENUINE.

This group includes GM GENUINE 24504031 and GM GENUINE 12676951.

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

3 Oil Drain Plug parts are listed for the 2021 Chevrolet Silverado 6500 HD, from DORMAN and GM GENUINE.

This group includes DORMAN 090948CD, DORMAN 090948 and GM GENUINE 55577568.

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

3 Oil Drain Plug Gasket parts for the 2021 Chevrolet Silverado 6500 HD come from 2 brands — DORMAN and GM GENUINE.

Part numbers include DORMAN 097119, DORMAN 97119 and GM GENUINE 12616850.

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

One part is listed for the 2021 Chevrolet Silverado 6500 HD — ACDELCO FC261.

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 Chevrolet Silverado 6500 HD, from WIX, FAMOUS BRAND, FVP and 5 other brands. WIX WL10255XP carries the "Popular" badge.

Economy: 3 parts, from FAMOUS BRAND, FVP and PRO-TEC. A representative part number is FAMOUS BRAND 95396.

In the High Performance / Heavy Duty grade, WIX and MOBIL 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 WIX WL10255XP.

The Standard Replacement section: 5 options from WIX, ACDELCO, HASTINGS / BALDWIN and 1 other brand. ACDELCO PF63 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 both parts for the 2021 Chevrolet Silverado 6500 HD.

Listed part numbers: GM GENUINE 12651561 and GM GENUINE 11569584.

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 2021 Chevrolet Silverado 6500 HD — 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 2021 Chevrolet Silverado 6500 HD — GM GENUINE 12638820.

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

2 Oil Pan parts for the 2021 Chevrolet Silverado 6500 HD come from 2 brands — DORMAN and SKP.

This group includes DORMAN 264882 and SKP SK264882.

This table covers the Oil Pan bolts. Read more

GM GENUINE supplies the 3 Oil Pan Bolt parts for the 2021 Chevrolet Silverado 6500 HD.

Listed part numbers: GM GENUINE 11548002, GM GENUINE 11588713 and GM GENUINE 11588725.

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 2021 Chevrolet Silverado 6500 HD — GM GENUINE 12642251.

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 Chevrolet Silverado 6500 HD — GM GENUINE 12731119.

This table covers the pickup tubes and screens that feed the oil pump. Read more

This group shows a single part: GM GENUINE 12706083.

This table covers the Piston Pin retainers. Read more

One part is listed for the 2021 Chevrolet Silverado 6500 HD — GM GENUINE 12656762.

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

6 Piston Ring parts for the 2021 Chevrolet Silverado 6500 HD come from GM GENUINE. The "Popular" part is GM GENUINE 12686801.

Part numbers include GM GENUINE 12686801, GM GENUINE 97250335 and GM GENUINE 97318057, among others listed above.

This table covers the pushrods that transfer lifter motion to the rocker arms. Read more

This group shows a single part: GM GENUINE 12633924.

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

GM GENUINE supplies both parts for the 2021 Chevrolet Silverado 6500 HD.

Part numbers include GM GENUINE 12636189 and GM GENUINE 12636190.

This table covers the Rocker Arm shafts. Read more

One part is listed for the 2021 Chevrolet Silverado 6500 HD — GM GENUINE 12648424.

This table covers the Timing Camshaft Gear bolts. Read more

This group shows a single part: GM GENUINE 11610686.

This table covers the Timing covers. Read more

This group shows a single part: GM GENUINE 12739836.

This table covers the Timing Cover bolts. Read more

GM GENUINE supplies both parts for the 2021 Chevrolet Silverado 6500 HD.

Listed part numbers: GM GENUINE 11588730 and GM GENUINE 11515759.

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

One part is listed for the 2021 Chevrolet Silverado 6500 HD — GM GENUINE 12634113.

This table covers the Timing gears. Read more

This group shows a single part: GM GENUINE 12698076.

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

One part is listed for the 2021 Chevrolet Silverado 6500 HD — GM GENUINE 12723084.

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

3 Turbocharger Coolant Line parts are listed for the 2021 Chevrolet Silverado 6500 HD, from DORMAN, GM GENUINE and GPD.

Part numbers include DORMAN 667439, GM GENUINE 12725135 and GPD 2571608.

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

4 Turbocharger Gasket parts for the 2021 Chevrolet Silverado 6500 HD come from GM GENUINE.

Part numbers include GM GENUINE 12651147, GM GENUINE 12688018 and GM GENUINE 12677294, among others listed above.

This table covers the Turbocharger Heat shields. Typical signs include a bent shield rubbing a rotor, or rust-through that leaves the backing open. A rubbing shield will eat a new rotor. Straighten or replace it before the wheel goes back on. Read more

2 Turbocharger Heat Shield parts for the 2021 Chevrolet Silverado 6500 HD come from GM GENUINE.

Listed part numbers: GM GENUINE 12705659 and GM GENUINE 12723833.

This table covers the fasteners that mount the turbocharger. Read more

This group shows a single part: GM GENUINE 11547786.

This table covers the Turbocharger nuts. Read more

This group shows a single part: GM GENUINE 19404928.

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

5 Turbocharger Oil Line parts are listed for the 2021 Chevrolet Silverado 6500 HD, from GATES and GM GENUINE. GM GENUINE 12720306 carries the "Popular" badge.

This group includes GM GENUINE 12720306, GATES TL229 and GATES TL304 and the remaining parts above.

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 4 Turbocharger Oil Line Gasket / O-Ring parts for the 2021 Chevrolet Silverado 6500 HD.

Listed part numbers: GM GENUINE 12662187, GM GENUINE 12691866 and GM GENUINE 12737100, plus the other parts above.

This table covers the Turbocharger Up pipes. Read more

2 Turbocharger Up Pipe parts for the 2021 Chevrolet Silverado 6500 HD come from GM GENUINE.

Part numbers include GM GENUINE 12688021 and GM GENUINE 12688020.

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

One part is listed for the 2021 Chevrolet Silverado 6500 HD — GM GENUINE 12723082.

This table covers the Valve covers. Read more

This group shows a single part: GM GENUINE 12707084.

This table covers the Valve Cover Bolt screws. Typical signs include a rounded head, a seeping bleeder, or a fastener that will not hold torque. Do not force a new screw into a stripped hole — repair the thread first. Read more

2 Valve Cover Bolt / Screw parts for the 2021 Chevrolet Silverado 6500 HD come from GM GENUINE.

Part numbers include GM GENUINE 11548174 and GM GENUINE 11547739.

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

One part is listed for the 2021 Chevrolet Silverado 6500 HD — GM GENUINE 12691860.

This table covers the Valve Cover washers. Read more

This group shows a single part: GM GENUINE 12654651.

This table covers the pressed-in bronze and cast-iron guides that align valve stems. Typical signs include oil smoke on startup, a guide that has gone oval, or a valve that no longer seats quietly. Guides are a machine-shop fit. Confirm stem diameter in the notes before ordering. Read more

One part is listed for the 2021 Chevrolet Silverado 6500 HD — SBI 1403142.

This table covers the Valve Lash caps. Typical signs include a leak at the neck, a cap that will not hold pressure, or a missing tether. Match the pressure rating or thread in the notes — radiator, reservoir and fuel caps are not interchangeable. Read more

One part is listed for the 2021 Chevrolet Silverado 6500 HD — GM GENUINE 12638257.

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

One part is listed for the 2021 Chevrolet Silverado 6500 HD — GM GENUINE 12670435.

This table covers the guides that keep each lifter aligned. Read more

One part is listed for the 2021 Chevrolet Silverado 6500 HD — GM GENUINE 12729382.

This table covers the Valve seats. Read more

2 Valve Seat parts for the 2021 Chevrolet Silverado 6500 HD come from SBI.

This group includes SBI SB1264E1 and SBI SB1343E1.

This table covers the springs that close each intake and exhaust valve. Typical signs include a sagging corner, a broken coil, or a clunk from the spring pocket. Replace springs in axle pairs and inspect the seats. Read more

3 Valve Spring parts for the 2021 Chevrolet Silverado 6500 HD come from 3 brands — GM GENUINE, QUALCAST and SBI.

Listed part numbers: GM GENUINE 12729741, QUALCAST 326711 and SBI 1601701.

This table covers the Valve Spring retainers. Read more

2 Valve Spring Retainer parts for the 2021 Chevrolet Silverado 6500 HD come from 2 brands — QUALCAST and SBI.

Listed part numbers: QUALCAST 555087 and SBI 1611087.

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

2 Valve Spring Retainer Keeper parts for the 2021 Chevrolet Silverado 6500 HD come from 2 brands — GM GENUINE and SBI.

This group includes GM GENUINE 12636193 and SBI 1211048.

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

2 Valve Stem Seal parts are listed for the 2021 Chevrolet Silverado 6500 HD, from GM GENUINE and SBI.

Part numbers include GM GENUINE 12633926 and SBI 1221510.