88 5.0 M5R2 Clutch won’t disengage

[Fiveowen]

Hi, so I’ve got an 88, 5.0 swapped, the trans blew so I began swapping in a 1997 f150 M5R2 in place of the old fw146. I used flywheel and clutch out of a 95, 5.0 f150, the stock master cylinder out of the truck and the slave from a 1992 ford ranger because in that year they came with internal slaves and Mazda transmissions and it has the proper fitting to connect to the 88’ master cylinder…
I’ve got the truck all together now, custom crossmember and driveshaft made but no matter now much I bleed the system I cannot get the clutch to fully disengage. Any ideas? Thank you in advance.

 

[Mechrick]

It's not uncommon to have trapped air in the master/slave. If you look at the angle of the master cylinder, notice it's angled downward and the fitting is lower than the cylinder. What I do is remove the master from the firewall, tilt it so the line fitting is the highest point and actuate the pushrod a few times with the bleeder cracked.

If you are not sure it's air, shine a light on the master where the pushrod enters the cylinder. When pushing the pedal down, as soon as the cylinder starts to move you should feel resistance. If the cylinder piston moves a small amount (say, 1/2") before significant resistance is felt, then air is present.

 

[Fiveowen]

It's not uncommon to have trapped air in the master/slave. If you look at the angle of the master cylinder, notice it's angled downward and the fitting is lower than the cylinder. What I do is remove the master from the firewall, tilt it so the line fitting is the highest point and actuate the pushrod a few times with the bleeder cracked.

If you are not sure it's air, shine a light on the master where the pushrod enters the cylinder. When pushing the pedal down, as soon as the cylinder starts to move you should feel resistance. If the cylinder piston moves a small amount (say, 1/2") before significant resistance is felt, then air is present.

Okay sweet thank you, I will try that, do you think it’s possible at all that the 92 slave cylinder doesn’t have enough throw to disengage the clutch?

 

[Mechrick]

It's possible. Can you see into the bell housing? You just want to verify the throw out bearing is touching the pressure plate fingers.