Issues with 4.0 SOHC motor
I have a 2004 ford explorer with the 4.0 SOHC, it has about 150k miles on it right now. The timing chain guide hit the valve cover and put a hole inside it, and its running a little rough. It simply acts as if the idle is set too low. I speculate that the slop in the timing chain, or it jumped time causing the rough idle.
My main question is should I replace the motor, or replace the timing gear set and its components? Of course I want to have a good longevity from this repair
One thing I noticed is, the cam and rockers are coated very well with oil, so I'm assuming the lashers are producing enough oil, the rockers are pretty solid and there isn't any gouges in the cam. I also noticed the intake ports were pretty heavily coated in carbon. The motor is $2,400 and the timing gear set, with all the gears, chains, cassettes and guides is about $450. To rebuild the top end is going to run me about $1,400.