Subaru Timing Chain Replacement Cost (FB Engines)
Full timing chain, tensioner, and guide replacement with complete front engine reseal for FB20/FB25 engines.
$1,600–$2,800national average
Parts
$550–$850
Labor
8–12 hrs
DIY-friendly?
Yes (5/5)
Why this fails
While FB20 and FB25 chains are designed for the life of the engine, extended oil change intervals (10k+ miles) lead to sludge and tensioner failure. This causes 'chain slap' and eventual stretching beyond the tensioner's reach.
What the job involves
- Draining coolant and engine oil.
- Removal of the radiator, cooling fans, and serpentine belt drive system.
- Removal of the front timing chain cover (requires breaking the factory RTV seal).
- Aligning the crankshaft and camshafts to TDC (Top Dead Center).
- Replacing both timing chains, all guides, and hydraulic tensioners.
- Applying fresh ThreeBond sealant and re-torquing the front cover.
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If you delay this repair
Chain stretch leads to skipped timing, which on these interference engines results in valves hitting pistons and total engine failure.
Save money
- • Replace the water pump and thermostat while the front cover is off, as labor is overlapping.
- • Re-use the front timing cover if it isn't warped; most shops only charge for the reseal labor.
- • Stick to OEM chains; aftermarket chains are notorious for stretching within 20k miles.
OEM part numbers
13143AA110 (Chain)13141AA080 (Chain)13142AA090 (Tensioner)13142AA080 (Tensioner)ThreeBond 1217H (Sealant)
FAQ
How much does subaru timing chain replacement cost (fb engines) cost in 2026?
Expect $1,600–$2,800 at most US shops, parts plus labor.
How long does the job take?
8–12 labor hours typically.
Can I do this myself?
Yes — DIY difficulty 5/5.
What happens if I delay?
Chain stretch leads to skipped timing, which on these interference engines results in valves hitting pistons and total engine failure.