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.
How do you replace the timing chain on a 1994 mercury grand marquis
The 2005 Mercury Grand Marquis , 4.6 liter SOHC , V8 engine has ( 2 ) timing chains ( 1 timing chain to each cylinder head )
Chain
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 )
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 )
A grand marquis wiring diagram can be found in a Chiltons or Haynes auto repair manual.
Mercury Grand Marquis was created in 1983.
Try Autozone.com - they very likely have an on-line illustrated repair guide for the '93 Grand Marquis.
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 )
Take it to a repair shop.
According to my Chilton's Auto Repair manual : A 1988 Mercury Grand Marquis has a ( 20 U.S. gallon ) gas tank
According to my Chilton's Auto Repair manual : A ( 1987 ) Mercury Grand Marquis has a ( 20 U.S. gallon gas tank )