Quick answer: Timing Chain Replacement Complete on a 2010–2017 GMC Terrain is rated Advanced and takes about 8.5 hours. You'll need 10 tools for this job, and parts cost about $630. This guide walks you through the full job step by step, including the mistakes to avoid.
| Part Name |
Part Number |
Price |
Buy |
| Timing Chain Kit |
9-4201SBWP |
$300.00 |
|
| Timing Chain Tensioner |
GM 12658253 |
$150.00 |
|
| Crankshaft Sprocket |
— |
$100.00 |
|
| Timing Chain Guide |
GM 12658256 |
$80.00 |
|
| Front crankshaft seal |
— |
— |
|
About prices: shown prices are typical retail averages and change frequently; cheaper alternatives may be available. Confirm the current price before buying.
💡 Pro tip: Order all parts at once to save on shipping
Step-by-Step Instructions
Follow these steps carefully
1
Diagnose and prepare for major engine work
Disconnect the negative battery cable. Drain coolant and oil if the front cover must come off. This is an advanced job — have the service manual torque/timing specs ready.
🔧 Mechanic's note — Tom Becker
On the Terrain I pull the negative cable and tuck it behind the washer reservoir. Timing work means rotating the crank for hours, and I have seen a cable end vibrate its way back onto the post. Not on my watch.
2
Remove accessories and the front cover
Remove the serpentine belt, harmonic balancer/crank pulley, and any brackets blocking the timing cover. Support the engine if a mount must be removed. Unbolt the timing cover carefully and note sealant locations.
3
Lock the engine at TDC and remove the chain set
Rotate to TDC and install cam/crank locking tools if specified. Relieve tensioner pressure, remove the chain, guides, and tensioner as a set. Inspect sprocket teeth for hooking or wear and replace sprockets if worn.
4
Install the new chain, guides, and tensioner
Fit new guides and tensioner, then route the new chain with colored links or marks aligned to the sprocket marks per the procedure for this engine. Oil the tensioner as required before activation.
5
Verify timing and reseal the cover
Activate the tensioner, remove locks, and rotate the engine by hand two full turns — reconfirm all marks. Clean cover mating surfaces and apply the specified sealant bead; install a new front crank seal. Torque cover bolts in sequence.
6
Refill fluids, start, and listen
Reinstall the balancer, belt, and mounts. Refill oil and coolant, reconnect the battery, and start the engine. Listen for chain rattle on cold start and watch for oil/coolant leaks at the cover.
All Done!
Test your repair before closing everything up. If something doesn't work right, double-check your steps.
⚠️ Common Mistakes to Avoid
- • Failing to properly align timing marks, leading to engine misfire or damage.
- • Not resetting the timing chain tensioner correctly, causing excessive chain slack.
- • Using incorrect torque specifications, resulting in component failure.
