Valve Seat Recession
Valve seat recession is wear of soft exhaust valve seats in older engines, made worse by unleaded fuel.
What is Valve Seat Recession?
It reduces valve clearance over time. It can lead to burnt valves and low compression. Fitting hardened seats is the permanent fix. A compression test can reveal valves that no longer seal.
How it works
Without lead deposits, valve and seat micro-weld and wear under heat and load.
Why it matters for your car
Check valve clearances regularly on older engines. Use a lead replacement additive if the seats are not hardened.
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