Diagram of timing chain placement
Get a Haynes repair manual
SOURCE: there is a ticking noise that won't quit. I've
3 chains ONLY (1 chain from the crank to idler sprocket/ 2 from idler sprocket to cams). This ticking noise are usually associated with poor oil flow through the upper part of the engine or sticking lifters. If this vehicle has over 80k miles, have the oil pan and oil pick-screen cleaned!! If the problems not severe yet, it will go away!!
SOURCE: how hard is it to replace timing chain on ford
There are 2 different 4.0L type engines on Ford Explorers if it is the VIN letter E (8th number reading left to right) then yes it has a timing chain on the back and there are 3 timing chains on the front. You will need special tools to hold the timing in place whille you change the chains. You can buy them from several different tool manufacturers. I bought mine from Snap-on but it was several hundred dollars and came with many different adapters for several different engines. But be prepared to spend a little money they aren't cheap even the small sets. Depending upon how much you'll use them you may want to see how much it would cost to have it done or try to find someone to loan you some. If you do then it's just a matter of following the procedure in the maintenance manual. As far as how hard is it? It isn't rocket science but I would make sure you read over the procedure in a repair manual, see if you can get the special tools you will need and depending upon your mechanical aptitude determine if it's something you want to tackle yourself. Good luck.
SOURCE: 01 ford explorer sport trac rear timing chain diagram
They will not loan you the tools.....how else will they continue to rip off the average garage junkie and make lots of money?
SOURCE: spark plug wire diagram for 91 ford f150 302
here is a diagram, if u can't see it go to the link below.
http://autorepair.about.com/library/firing_orders/bl-fo-9225.htm
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If you have any questions PSE come back . Good luck
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