The 4.6 liter SOHC , V8 engine in a 2000 Mercury Grand Marquis has ( 1 ) timing CHAIN to each cylinder head ( so there are two timing CHAINS )
Chain
The 2005 Mercury Grand Marquis , 4.6 liter SOHC , V8 engine has ( 2 ) timing chains ( 1 timing chain to each cylinder head )
In a 1997 Mercury Grand Marquis : ( YES ) the 4.6 liter Single Over Head Cam , V8 engine has ( 1 timing CHAIN to each cylinder head , so there are 2 timing CHAINS )
Worn timing chain?
The engine in the Mercury Villager does not use a timing chain, it uses a timing belt. The recommended belt replacement interval is 105,000 miles.
The timing chain can not be repaired, it must be replaced. To do this you must disassemble the front of the engine. The fan, belt, dampener, water pump and timing chain cover must be removed to gain access to the chain.
On a 2002 Mercury Grand Marquis : No , the 4.6 liter Single Over Head Cam , V8 engine has ( 1 timing CHAIN to each cylinder head , so there are 2 timing CHAINS )
The 2.3 liter 4 cylinder and the 3.0 liter V6 have a timing CHAIN
To replace the timing chain on a 2001 Mercury Cougar with a 2.5L engine, first, disconnect the battery and remove the engine covers and accessories obstructing access to the timing chain. Next, align the timing marks on the crankshaft and camshaft to TDC (top dead center) before removing the old timing chain. Replace the timing chain and tensioner, ensuring proper alignment with the timing marks. Finally, reassemble all components, reconnect the battery, and run the engine to check for proper operation.
Timing chain.
You never need to replace the timing chain if the engin use timing chain(not timing belt).