2021 Chevrolet Express 4500 Engine Parts

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 4500 — GM GENUINE 12711681.

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

3 Camshaft parts are listed for the 2021 Chevrolet Express 4500, from GM GENUINE and MELLING.

Listed part numbers: GM GENUINE 12742436, GM GENUINE 12672469 and MELLING MC1432.

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 4500.

This group includes GM GENUINE 12679049 and GM GENUINE 12686894.

This table covers the Camshaft bolts. Read more

This group shows a single part: GM GENUINE 11561455.

This table covers the Camshaft Dowel pins. Read more

One part is listed for the 2021 Chevrolet Express 4500 — GM GENUINE 24575061.

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 4500 come from 4 brands — DORMAN, FEL-PRO, GM GENUINE and 1 other brand.

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

2 Camshaft Seal parts for the 2021 Chevrolet Express 4500 come from 2 brands — GM GENUINE and MAHLE / CLEVITE.

Listed part numbers: GM GENUINE 12643563 and MAHLE / CLEVITE B32270.

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

One part is listed for the 2021 Chevrolet Express 4500 — GM GENUINE 12735504.

This table covers the Connecting Rod bolts. Read more

3 Connecting Rod Bolt parts for the 2021 Chevrolet Express 4500 come from GM GENUINE.

Listed part numbers: GM GENUINE 11548432, GM GENUINE 12625461 and GM GENUINE 11570662.

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

One part is listed for the 2021 Chevrolet Express 4500 — 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

This group shows a single part: GM GENUINE 12729655.

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 4500.

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

5 Crankshaft Seal parts for the 2021 Chevrolet Express 4500 come from 3 brands — GM GENUINE, FEL-PRO and VICTOR REINZ. The "Popular" part is GM GENUINE 12634614.

Part numbers include GM GENUINE 12634614, FEL-PRO TCS46221 and GM GENUINE 29625, among others listed above.

This table covers the Crankshaft Seal covers. Read more

One part is listed for the 2021 Chevrolet Express 4500 — GM GENUINE 12705664.

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 4500 — GM GENUINE 12627520.

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

One part is listed for the 2021 Chevrolet Express 4500 — GM GENUINE 12570326.

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

5 Cylinder Head Bolt parts are listed for the 2021 Chevrolet Express 4500, from GM GENUINE, FEL-PRO and MAHLE / CLEVITE. GM GENUINE 11546959 carries the "Popular" badge.

This group includes GM GENUINE 11546959, FEL-PRO ES73121 and GM GENUINE 11611976 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

4 Cylinder Head Gasket parts are listed for the 2021 Chevrolet Express 4500, from ENGINE PRO, FEL-PRO, GM GENUINE and 1 other brand.

Part numbers include ENGINE PRO 2812688186, FEL-PRO 26920PT and GM GENUINE 12688186, 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 2021 Chevrolet Express 4500 — MAHLE / CLEVITE HS55550.

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

This group shows a single part: GM GENUINE 24502262.

This table covers the Engine Block drain plugs. Read more

One part is listed for the 2021 Chevrolet Express 4500 — GM GENUINE 11602951.

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

This group shows a single part: 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 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 for the 2021 Chevrolet Express 4500 come from 2 brands — GM GENUINE and MELLING.

This group includes GM GENUINE 12733470 and MELLING V5828.

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

One part is listed for the 2021 Chevrolet Express 4500 — GM GENUINE 12680364.

This table covers the Harmonic Balancer bolts. Read more

2 Harmonic Balancer Bolt parts for the 2021 Chevrolet Express 4500 come from 2 brands — FEL-PRO and GM GENUINE.

This group includes FEL-PRO 73372 and GM GENUINE 11547372.

This table covers the Intake Manifold bolts. Read more

One part is listed for the 2021 Chevrolet Express 4500 — 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

5 Intake Manifold Gasket parts are listed for the 2021 Chevrolet Express 4500, from GM GENUINE, MAHLE / CLEVITE and FEL-PRO. GM GENUINE 12626354 carries the "Popular" badge.

Part numbers include GM GENUINE 12626354, FEL-PRO MS97432 and GM GENUINE 12693081, among others listed above.

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

This group shows a single part: MELLING V5827.

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

2 Motor Mount parts for the 2021 Chevrolet Express 4500 come from 2 brands — ANCHOR and GM GENUINE.

Part numbers include ANCHOR 3681 and GM GENUINE 85043423.

This table covers the Motor Mount bolts. Read more

GM GENUINE supplies the 3 Motor Mount Bolt parts for the 2021 Chevrolet Express 4500.

Listed part numbers: 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 4500 — GM GENUINE 11515775.

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

9 Oil parts for the 2021 Chevrolet Express 4500 come from 3 brands — MOBIL, PENTOSIN and ACDELCO. The "Popular" part is MOBIL 125195.

The Full Synthetic section lists 7 options from MOBIL, PENTOSIN and ACDELCO — full-synthetic oils. MOBIL 125195 is listed in this group.

In the High Mileage (>75,000 Miles) grade, MOBIL supplies 2 parts: oils grouped for high-mileage engines. A representative part number is MOBIL 123842.

Part numbers include MOBIL 125195, MOBIL 124315 and ACDELCO 109324, among others listed above.

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 are listed for the 2021 Chevrolet Express 4500, from DORMAN, GM GENUINE and MAHLE / CLEVITE.

Part numbers include DORMAN 66219, GM GENUINE 23129010 and MAHLE / CLEVITE B33562.

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

2 Oil Cooler Line parts for the 2021 Chevrolet Express 4500 come from GM GENUINE.

Listed part numbers: 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

One part is listed for the 2021 Chevrolet Express 4500 — GM GENUINE 84240291.

This table covers the Oil Dipstick tubes. Read more

3 Oil Dipstick / Tube parts for the 2021 Chevrolet Express 4500 come from GM GENUINE.

This group includes GM GENUINE 12698592, GM GENUINE 12698584 and GM GENUINE 12698591.

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 are listed for the 2021 Chevrolet Express 4500, from FEL-PRO and GM GENUINE.

This group includes FEL-PRO 73889 and GM GENUINE 24504031.

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

4 Oil Drain Plug parts for the 2021 Chevrolet Express 4500 come from 2 brands — DORMAN and GM GENUINE.

Part numbers include DORMAN 090948CD, DORMAN 090948 and GM GENUINE 55577568, 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

5 Oil Drain Plug Gasket parts are listed for the 2021 Chevrolet Express 4500, from DORMAN, FEL-PRO, GM GENUINE and 1 other brand. FEL-PRO 70820 carries the "Popular" badge.

Listed part numbers: FEL-PRO 70820, DORMAN 097119 and DORMAN 97119, plus the other parts above.

This table covers the Oil Drain Plug inserts. Read more

One part is listed for the 2021 Chevrolet Express 4500 — GM GENUINE 11503302.

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

2 Oil Filler Cap parts for the 2021 Chevrolet Express 4500 come from 2 brands — ACDELCO and MOTORAD.

Part numbers include ACDELCO FC279 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

One part is listed for the 2021 Chevrolet Express 4500 — GM GENUINE 24100002.

This table covers the Oil Filler Tube grommets. Read more

One part is listed for the 2021 Chevrolet Express 4500 — GM GENUINE 12610201.

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

9 Oil Filter parts for the 2021 Chevrolet Express 4500 come from 7 brands — VARIOUS MFR, MAHLE / CLEVITE, FRAM and 4 other brands. The "Popular" part is ACDELCO PF63.

The Economy section lists 2 options from FRAM and VARIOUS MFR — the catalog's value-priced group. FRAM FE10575 is listed in this group.

The High Performance / Heavy Duty section lists 1 option from MOBIL — grouped under the catalog's "High Performance / Heavy Duty" designation — the notes column spells out what sets them apart. MOBIL M1212A is listed in this group.

In the Standard Replacement grade, MAHLE / CLEVITE, ACDELCO, WIX and 2 other brands supply 6 parts: built to original-equipment specification. A representative part number is ACDELCO PF63.

Part numbers include ACDELCO PF63, FRAM FE10575 and VARIOUS MFR PG2500, among others listed above.

This table covers the Oil Filter adapters. Read more

One part is listed for the 2021 Chevrolet Express 4500 — GM GENUINE 12600225.

This table covers the seals at the Oil Filter Housing. 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

This group shows a single part: GM GENUINE 12610160.

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

2 Oil Galley Plug parts for the 2021 Chevrolet Express 4500 come from 2 brands — ENGINETECH and GM GENUINE.

This group includes ENGINETECH OGV2 and GM GENUINE 11546667.

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

This group shows a single part: 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

This group shows a single part: GM GENUINE 12638820.

This table covers the Oil nozzles. Read more

This group shows a single part: GM GENUINE 12678499.

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

One part is listed for the 2021 Chevrolet Express 4500 — GM GENUINE 12739177.

This table covers the Oil Pan bolts. Read more

3 Oil Pan Bolt parts for the 2021 Chevrolet Express 4500 come from GM GENUINE.

Listed part numbers: GM GENUINE 12554990, GM GENUINE 11588725 and GM GENUINE 12625642.

This table covers the Oil Pan covers. Read more

This group shows a single part: GM GENUINE 12630766.

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

4 Oil Pan Gasket parts for the 2021 Chevrolet Express 4500 come from 2 brands — GM GENUINE and VICTOR REINZ.

This group includes GM GENUINE 12666993, GM GENUINE 12623359 and GM GENUINE 12621086 and the remaining parts above.

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

2 Oil Pump parts for the 2021 Chevrolet Express 4500 come from 2 brands — GM GENUINE and MELLING.

This group includes GM GENUINE 12744612 and MELLING M595.

This table covers the Oil Pump bolts. Read more

One part is listed for the 2021 Chevrolet Express 4500 — GM GENUINE 11610074.

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

One part is listed for the 2021 Chevrolet Express 4500 — GM GENUINE 12686431.

This table covers the seals at the Oil Pump Control Valve / Solenoid. 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

This group shows a single part: GM GENUINE 12626252.

This table covers the Oil Pump Cover bolts. Read more

This group shows a single part: GM GENUINE 11588716.

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

One part is listed for the 2021 Chevrolet Express 4500 — GM GENUINE 12638433.

This table covers the windage trays that keep crank windage out of the oil sump. Read more

This group shows a single part: GM GENUINE 12619978.

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

GM GENUINE supplies the 5 Piston parts for the 2021 Chevrolet Express 4500.

Listed part numbers: GM GENUINE 12699527, GM GENUINE 12699528 and GM GENUINE 12699529, plus the other parts above.

This table covers the Piston Pin retainers. Read more

This group shows a single part: GM GENUINE 01647383.

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

GM GENUINE supplies both parts for the 2021 Chevrolet Express 4500.

This group includes GM GENUINE 12735470 and GM GENUINE 12661872.

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

3 Push Rod parts are listed for the 2021 Chevrolet Express 4500, from GM GENUINE, MELLING and SBI.

Listed part numbers: GM GENUINE 12619828, MELLING MPR696 and SBI 1901555.

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

5 Rocker Arm parts for the 2021 Chevrolet Express 4500 come from 5 brands — GM GENUINE, ENGINETECH, MELLING and 2 other brands. The "Popular" part is GM GENUINE 12619829.

Listed part numbers: GM GENUINE 12619829, ENGINETECH ER913 and MELLING MR913, plus the other parts above.

This table covers the Timing Camshaft Gear bolts. Read more

One part is listed for the 2021 Chevrolet Express 4500 — GM GENUINE 12625597.

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

5 Timing Chain parts are listed for the 2021 Chevrolet Express 4500, from MELLING, ACDELCO, GM GENUINE and 2 other brands. MELLING 3SRH60 carries the "Popular" badge.

Listed part numbers: MELLING 3SRH60, ACDELCO 12646386 and GM GENUINE 12646387, plus the other parts above.

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

7 Timing Chain & Component Kit parts for the 2021 Chevrolet Express 4500 come from 4 brands — MELLING, PREFERRED COMPONENTS INC, S.A. GEAR and 1 other brand. The "Popular" part is MELLING 33SRH60SX.

The Economy section: 2 options from PREFERRED COMPONENTS INC and S.A. GEAR. PREFERRED COMPONENTS INC TS10361 is listed in this group.

The High Performance section lists 2 options from MELLING — engineered beyond original-equipment specification. MELLING 485755 is listed in this group.

Standard Replacement: 3 parts, from MELLING and ENGINETECH. A representative part number is MELLING 33SRH60SX.

This group includes MELLING 33SRH60SX, PREFERRED COMPONENTS INC TS10361 and S.A. GEAR 76291 and the remaining parts 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

5 Timing Chain Tensioner parts for the 2021 Chevrolet Express 4500 come from 4 brands — GM GENUINE, MELLING, PREFERRED COMPONENTS INC and 1 other brand. The "Popular" part is GM GENUINE 12630107.

This group includes GM GENUINE 12630107, GM GENUINE 11515758 and MELLING BT5174 and the remaining parts above.

This table covers the Timing covers. Read more

3 Timing Cover parts are listed for the 2021 Chevrolet Express 4500, from GM GENUINE and SKP.

This group includes GM GENUINE 12691692, GM GENUINE 12734113 and SKP SK12691692.

This table covers the gaskets that seal the Timing Cover. 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 24585065.

This table covers the seals at the Timing Cover. 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 Timing Cover Seal parts for the 2021 Chevrolet Express 4500 come from 2 brands — GM GENUINE and MAHLE / CLEVITE.

This group includes GM GENUINE 24585065 and MAHLE / CLEVITE 68019.

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

4 Timing Crank Sprocket parts for the 2021 Chevrolet Express 4500 come from 4 brands — GM GENUINE, MELLING, PREFERRED COMPONENTS INC and 1 other brand.

Part numbers include GM GENUINE 12713934, MELLING S1355 and PREFERRED COMPONENTS INC G56067, among others listed above.

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

One part is listed for the 2021 Chevrolet Express 4500 — GM GENUINE 12625673.

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

This group shows a single part: GM GENUINE 55499618.

This table covers the Valve covers. Read more

GM GENUINE supplies both parts for the 2021 Chevrolet Express 4500.

Part numbers include GM GENUINE 12727455 and GM GENUINE 12723317.

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

One part is listed for the 2021 Chevrolet Express 4500 — GM GENUINE 11547061.

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

3 Valve Cover Gasket parts for the 2021 Chevrolet Express 4500 come from 3 brands — FEL-PRO, GM GENUINE and MAHLE / CLEVITE.

This group includes FEL-PRO VS50907R, GM GENUINE 12619787 and MAHLE / CLEVITE VS50731.

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

This group shows a single part: SBI 1403204.

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

5 Valve Lifter parts for the 2021 Chevrolet Express 4500 come from 4 brands — SEALED POWER, MELLING, GM GENUINE and 1 other brand. The "Popular" part is MELLING JB2079.

This group includes MELLING JB2079, GM GENUINE 12698945 and SBI VL559 and the remaining parts above.

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

This group shows a single part: GM GENUINE 12595365.

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

4 Valve Spring parts are listed for the 2021 Chevrolet Express 4500, from MELLING, GM GENUINE and SBI.

Part numbers include GM GENUINE 12728733, MELLING VS1688 and MELLING VTSS100, among others listed above.

This table covers the Valve Spring retainers. Read more

3 Valve Spring Retainer parts are listed for the 2021 Chevrolet Express 4500, from GM GENUINE and MELLING.

This group includes GM GENUINE 12625564, GM GENUINE 10166344 and MELLING VSR709.

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

3 Valve Spring Retainer Keeper parts are listed for the 2021 Chevrolet Express 4500, from GM GENUINE, MELLING and SBI.

Listed part numbers: GM GENUINE 10166345, MELLING VL760 and SBI 1211085.

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

6 Valve Stem Seal parts for the 2021 Chevrolet Express 4500 come from 3 brands — GM GENUINE, SBI and VICTOR REINZ. The "Popular" part is GM GENUINE 12689006.

This group includes GM GENUINE 12689006, GM GENUINE 12689007 and GM GENUINE 90410741 and the remaining parts above.

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

4 Variable Valve Timing (VVT) Solenoid / Actuator parts for the 2021 Chevrolet Express 4500 come from 3 brands — GM GENUINE, WALKER PRODUCTS and VAICO.

The Economy section: 1 option from WALKER PRODUCTS. WALKER PRODUCTS 5901399 is listed in this group.

Standard Replacement: 2 parts, from GM GENUINE. A representative part number is GM GENUINE 12675031.

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

Listed part numbers: WALKER PRODUCTS 5901399, GM GENUINE 12675031 and GM GENUINE 12746597, plus the other parts above.

This table covers the seals at the Variable Valve Timing (VVT) Solenoid Gasket. 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 2021 Chevrolet Express 4500 — GM GENUINE 12623437.

This table covers the cam phaser sprockets used by the variable-valve-timing system. Read more

This group shows a single part: GM GENUINE 12689342.