I’ve read some conflicting information regarding the torque specs for the main crank bolts. Some say they are not TTY and give a straight torque value while others say they are TTY with a 90 degree turn. I read somewhere that the earlier 4.0s (94-97) are not TTY but the newer motors were. Does anyone have reliable specs for the 2000 4.0 OHV pushrod motor? Thanks

 

In 1997 Ford came out with the 4.0l SOHC engine, used in Explorers, 1997 and up
Same block and crank as the 4.0l OHV, used in Rangers 1990-2000, in 2001 Rangers got the 4.0l SOHC

So 1990-1996 4.0l OHV use the regular ft/lb torque, for rod and mains
1997 and up 4.0l OHV or SOHC use the ft/lb and then 90deg
You do not need to replace the rod or main bearing cap bolts, because they are not TTY bolts
You can use either torque spec, ft/lb only or ft/lb snug up then 90deg final

Head bolts are a different story they are TTY and do over stretch to hold better so should be replaced if tighten fully even one time

TTY bolts started to be used when car makers started using aluminum heads, aluminum expands more than cast iron when heated so regular head bolts can snap, and did, lol, so a newer method was needed which was TTY, these could stretch when heated then contract when cooled, repeatedly, maintaining a good seal
And so they just started using TTY only head bolts on all engines, bi-metal or not

It is a good technology, and even "back in the day" I used new head bolts after I snapped off a few old bolts during reassembly, so most mechanics didn't reuse regular head bolts unless there was no option for new

 

Thanks Ron, appreciate the great info!