I found this guide on fitting the dual stretch belts on the focus specifically the sigma/duratec with one belt for AC and the other for the rest  if you buy the kit from ford. I'm going to be doing this and thought this would help others. I take no credit for this guide. 

 

1, Wipe clean all of the pulleys to make sure that the accessory drive belt does not slip during installation

 

2,CAUTION: Make sure that the accessory drive belt guide tool is correctly fitted to the crankshaft pulley. The center of the accessory drive belt guide tool must be in the 12 o'clock position and the curved face is closest to the engine. Failure to follow this instruction may result in damage to the accessory drive belt during installation. Install the accessory drive belt guide tool (supplied in the parts kit) to the crankshaft pulley so that the center of the tool is at the 12 o'clock position (engine shown removed for clarity).

 

 

3,Position the accessory drive belt around the crankshaft pulley, power steering pump pulley and coolant pump pulley in the position shown (engine shown removed for clarity).

 

 

4,CAUTION: Make sure that an audible click is heard when the accessory drive belt installation tool locking tang is fitted to the coolant pump pulley. Failure to follow this instruction may result in damage to the accessory drive belt during installation. Install the accessory drive belt installation tool (supplied in the parts kit) to the coolant pump pulley in the position shown (engine shown removed for clarity

 

 

5,Rotate the accessory drive belt installation tool 90 degrees counterclockwise to the position shown (engine shown removed for clarity

 

 

6,

NOTE: Make sure that the accessory drive belt is correctly positioned into the grooves of the pulleys.

Slide the accessory drive belt off the coolant pump pulley and reposition around the accessory drive belt installation tool and generator pulley in the position shown (engine shown removed for clarity

 

 

7,CAUTION: Make sure that the accessory drive belt is correctly aligned to the accessory drive belt installation tool. Failure to follow this instruction may result in damage to the accessory drive belt. Rotate the accessory drive belt installation tool clockwise by hand until the accessory drive belt tension has increased (engine shown removed for clarity).

 

 

8,Make sure that this step is carried out from in front of the engine mounting. Failure to follow this instruction may result in damage to the accessory drive belt and installation tool.

NOTE: Make sure that the accessory drive belt is correctly positioned into the grooves of the pulleys.

Install the accessory drive belt. (engine shown removed for clarity).

• Using a suitable spanner, rotate the accessory drive belt installation tool approximately 45 degrees clockwise and hold.

• Using a second spanner, continue to rotate the accessory drive belt installation tool clockwise until the the accessory drive belt has been installed.

 

9,Using a suitable tool release the accessory drive belt installation tool locking tang from the coolant pump pulley.

 

 

10,Remove and discard the accessory drive belt guide tool.

 

 

11,Install the A/C compressor belt installation tool (supplied in the parts kit) to the crankshaft pulley at the 7 o'clock position (engine shown removed for clarity).

 

 

12,Install the A/C compressor belt around the A/C compressor pulley, under the crankshaft pulley and around the A/C compressor belt installation tool

 

 

13,Rotate the A/C compressor belt installation tool clockwise by hand until the A/C compressor belt tension has increased

 

 

14,

• NOTE: Only turn the engine in the normal direction of rotation.

  NOTE: Guide the A/C compressor belt onto the crankshaft pulley by hand as the crankshaft pulley is rotated.

  Turn the engine until the A/C compressor belt installation tool is at the 3 o'clock position.
•  

 

I am currently trying to replace belt now, I'm not a mechanic but have the basic knowledge and experience to atleast try and fix it myself, this post has helped and saved me hours of wasted time, I've put the repair on hold until the tool for the coolant pump arrives, of course I had to have the one without a tensioner pulley :(

were do you buy the special tool mate.

Yeah i got no tensioner pulley either lol

 

On 10/4/2018 at 1:28 PM, F0CUE said:

Install the accessory drive belt guide tool (supplied in the parts kit) to the crankshaft pulley