Timing chain deflection...

[airborn_ranger]

Bros, Engine is 200x (single-digit 2000, i.e., 2001, 2002, etc.). 130,xxx miles. What is maximum allowable deflection of the timing chain, and does it have a tensioner? The truck in question has approximately 3/4" deflection. The teeth on both sprockets appear to be symmetrically triangular, with the valley between the teeth a perfect "U". There is no tensioner mounted. Is the chain worn too much and in need of replacement? TIA.

 

[crazypj]

Ford say change the chain at 120,000, I'm interested to find out when the chain HAS to be replaced as I know the factory service is conservative
Guess I'll have an oil analysis done next oil change and see if there is excess 'iron' in the oil