Before you order: GM part numbers change by option code and year. Confirm against your VIN with a GM dealer. Callout numbers on this page are our own and do not match GM's diagram numbers. Quantities are per vehicle (both sides).
Engine: this page covers the 2.4L 4-cylinder (LAF 2010-2011, LEA 2012-2017) only. For the 3.0L / 3.6L V6, see Timing Chain V6. GM lists the same 2.4L timing numbers for the Malibu, Regal, LaCrosse, Verano, Orlando and Captiva Sport 2.4L. The 2.4L timing chain is a common failure item: GM sells the chain, guides and tensioner together as kit 1. Sprockets and cam actuators are sold separately. The drawing is simplified and not to scale.
Engine: this page covers the 2.4L 4-cylinder (LAF 2010-2011, LEA 2012-2017) only. For the 3.0L / 3.6L V6, see Timing Chain V6. GM lists the same 2.4L timing numbers for the Malibu, Regal, LaCrosse, Verano, Orlando and Captiva Sport 2.4L. The 2.4L timing chain is a common failure item: GM sells the chain, guides and tensioner together as kit 1. Sprockets and cam actuators are sold separately. The drawing is simplified and not to scale.
| # | Part | GM OEM # | Fitment & notes | Buy |
|---|---|---|---|---|
| 1 | Timing chain kit (chain, guides, tensioner, oil nozzle, guide bolts, seal) (not illustrated) | 12680750 | 2.4L (LAF 2010-2011, LEA 2012-2017). GM kit: includes the chain (2), guides (3, 4, 5), upper guide bolts (6), tensioner and seal (7, 8), oil nozzle (9) and the guide bolts that are only sold in the kit. Sprockets, cam actuators and the balance shaft chain are not included. | Check price on Amazon |
| 2 | Chain, camshaft timing | 24461834 | 2.4L. Part of kit 1. | Check price on Amazon |
| 3 | Guide, timing chain (with bushing) - tensioner side | 24449448 | 2.4L. Pivoting guide pushed by the tensioner. Part of kit 1. | Check price on Amazon |
| 4 | Guide, timing chain (without bushing) - fixed side | 13104978 | 2.4L. Part of kit 1. | Check price on Amazon |
| 5 | Guide, timing chain (upper, fixed) | 12588387 | 2.4L. Part of kit 1. | Check price on Amazon |
| 6 | Bolt, upper timing chain guide (acorn flange head) | 11518828 | 2.4L. Qty 2. GM: do not reuse once removed. Part of kit 1. | Check price on Amazon |
| 7 | Tensioner, timing chain | 12608580 | 2.4L. Includes seal (8). Part of kit 1. | Check price on Amazon |
| 8 | Seal, timing chain tensioner | 89060424 | 2.4L. Part of the tensioner (7) and kit 1. | Check price on Amazon |
| 9 | Nozzle, timing chain oil (without spring) | 12577163 | 2.4L. Part of kit 1. | Check price on Amazon |
| 10 | Plug, timing chain guide access hole | 11588880 | 2.4L. In the cylinder head. | Check price on Amazon |
| 11 | Sprocket, crankshaft (timing chain, front) | 24424758 | 2.4L. | Check price on Amazon |
| 12 | Key, crankshaft sprocket | 24424855 | 2.4L. | Check price on Amazon |
| 13 | Actuator, camshaft position (cam phaser, intake & exhaust) | 12621505 2010-2017 12578515 2010 intake only | 2.4L. Qty 2: GM lists 12621505 for both cams. On the 2010 diagram GM also lists 12578515 for the intake side; check your VIN for 2010-2011. | Check price on Amazon |
| 14 | Bolt, camshaft position actuator (M10x1.5x76) | 11588844 | 2.4L. Qty 2. Usually replaced with the actuators. | Check price on Amazon |
| 15 | Valve, camshaft position actuator solenoid | 12679099 Intake 12679100 Exhaust | 2.4L. One per cam, mounted in the cylinder head. | Check price on Amazon |
| 16 | Sensor, camshaft position | 12674704 | 2.4L. Qty 2. | Check price on Amazon |
| 17 | Sprocket, crankshaft (rear; drives balance shafts and water pump) | 90537301 | 2.4L. | Check price on Amazon |
| 18 | Chain, water pump & balance shaft | 12635427 | 2.4L. | Check price on Amazon |
| 19 | Tensioner, water pump & balance shaft chain | 28289946 | 2.4L. | Check price on Amazon |
| 20 | Guide, balance shaft chain (adjustable) | 90537299 | 2.4L. | Check price on Amazon |
| 21 | Bolt, balance chain adjustable guide (M6x1x30) | 11588714 | 2.4L. | Check price on Amazon |
| 22 | Guide, balance shaft chain (upper) | 90537336 | 2.4L. | Check price on Amazon |
| 23 | Guide, balance shaft chain (lower) | 90537369 | 2.4L. | Check price on Amazon |
| 24 | Sprocket, water pump | 90537298 | 2.4L. | Check price on Amazon |
| 25 | Shaft, balance (with sprocket) | 12721063 Passenger side 12721064 Driver side | 2.4L. Each includes its sprocket and bearings. | Check price on Amazon |
| 26 | Balancer, crankshaft (5-rib, slip fit) | 90537704 | 2.4L. GM does not show a separate 2.4L balancer bolt on these diagrams; ask the dealer with your VIN. | Check price on Amazon |
| 27 | Washer, crankshaft balancer | 12611099 | 2.4L. Qty 2 per GM. | Check price on Amazon |
| 28 | Cover, engine front (2.4L) (not illustrated) | 12637040 | 2.4L. Drawn on the Front Cover & Water Pump 2.4L page. | Check price on Amazon |
The illustration is an original drawing made for this site. It is not to scale and the shapes are representative.