If your asking this question than you shouldn't be performing this job yourself<
http://www.autozone.com/az/cds/en_us/0900823d/80/1b/58/a0/0900823d801b58a0/repairInfoPages.htm
SOHC: Single overhead cam DOHC: duel overhead cam it just means if you car is a single can, or twin cam, the SL1 modles are single cam, and the SL2 are duel cam
do u set the timing marks at btdc or tdc on a 2.5 mercury cougar
To adjust the timing take off the timing cover,take off belt and then line up the marks on the timing gear.You will need a special tool to hold the gears if it is a DOHC(duel over head cam)
Single overhead cam have interference with pistons & valves. While in duel overhead cam engines there is interference betwen the pistons & valves & also between the intake & exhaust valves.
It will fit seeing that they are both 1.9 liter motors, however there would need to be several adjustments made since the SL1 has a single overhead cam and the homecomming has a duel overhead cam
ABSOLUTELY!
I'm pretty sure the 1.9 is compatible throughout in all the years as long as you get weather is is a single overhead cam or a duel overhead cam motor. This can be identified by the 7 or the 9 on the eighth digit of the VIN. A junkyard or a rebuilder such as jasper engines could tell you.
The homophone for "duel" is "dual."
In real life you don't need a duel disk to duel.
It is played with a duel runner and a duel board. The duel can be initiated without the consent of the opponent with a field spell Speed World. When a riding duel starts in a stadium the MC will shout 'Riding Duel, Acceleration.'