Formally, the number 1 cylinder is the cylinder that is "top-dead center to fire" when the timing marks on the crankshaft and camshaft gears are aligned.
To make it easier, the cylinder numbers are often stamped into the intake manifold, usually right next to the intake port, and also in a picture of all cylinders someplace on the manifold. It is also often on the EPA emissions sticker.
In an inline engine, number one is usually in the front, nearest the water pump.
4 or 6 cylinder straight blocks No. 1 is always the first one next to the pulleys. On a V block, if you look down at the top of the engine, No. 1 will be slightly forward. It can be on either side of the motor, but most likely on the drivers side.
It is the cylinder closest to the belt side of the engine.
If you look at the distributor of the car, sometimes they are marked with the cylinder number on the cap. Find number 1 and follow the spark plug cable to the spark plug. That will be No. 1 cylinder.
For the 2.5 4 cylinder, number one is the first cylinder from the passenger side.For the 3.5 V6 cylinder, number one is the first cylinder in back from the passenger the side.
The number 1 cylinder is the cylinder to the right when you open the hood.
Cylinder 1 is the first/front cylinder on the right side of the engine looking from the front of the car. That bank is 1-3-5-7 and the left bank is 2-4-6-8.
First cylinder up front on the passenger side.
number 1 cylinder drivers side.
cylinder #1 is the first cylinder on the front of the engine
cylinder # 1 is the front cylinder on your straight 6
Number 1 is the cylinder closest to the timing belt. Mind you: Cylinder #1 is not the first cylinder to fire in the firing sequence.
1 cylinder is #1, the first cylinder, front of engine, the first cylinder.
1-----2-----3 4-----5-----6 front of Ford Taurus