A question like this is hard to answer, just because there is so much involved. i would suggest going to your local auto part store and buy a chilton manual. it will show you step by step how to do almost any thing to your car.
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When you set the timing if this year has a distributor you have to disconnect a wire to properly time it. Check witha. Chevy dealer. For wire to disconnect. On my 94 k1500 it's on the back of, the alternator.
if u think it jumped timing u will have to replace the timing chain. to do this locate timing chain cover and remove it. then find #1 cylinder and remove spark plug. turn engine till the piston is all the way to top of cylinder. u can tell this by placing a screwdriver in hole and turn engine by moving engine a little at a time till u feel piston come to top. unplug spark plugs so engine does not start. remove the timing chain and gears put chain on making sure that timing marks on gears line up perfect. if u are off just one tooth it will not run right. put back together. if u don't have one go to auto parts store and get repair book for your explorer. it gives u step by step inst. on the project
I'm sorry to tell you this, but you are going to have to start from ground zero. Take your timing cover back off. Ensure that your NO. 1 Piston is at TDC (Top Dead Center) and that your cam is aligned properly. Once you've done that, put the timing chain back on and bolt everything back together. If your timing is off a little bit, your engine won't run. If your timing is off alot, then your valves will hit the piston heads and cause ALOT of damage.
first you have to take off the exhaust manifold. then take off the top motor mount and lift plate on the passenger side on top. then take off the 25 little bolts and nuts off the timing chain cover. with the cover off, take out the bolts on the timing chain tensioner (towards botton, by the crank, looks like a little rod in a aluminum housing). now take off the curved tensioner shoe and the chain will loosen. take the chain off. now the fun part is getting the bolts off the back of the water pump to the block. then the bolts connecting the water pump to the steel housing. and finally the three nuts connecting the pump to the chain housing. not hard just frustrating. replace the pump and new gaskets (comes with pump) and bolt back everthing back together. you may want to change your thermostat while your there since its right by the pump. now putting the timing chain back on and having it in time isnt the hardest thing but if your a first timer take your time. go to a mechanic and ask to print out intalation insructions on timing chain installation. then bolt it all back together.
no adjustment neccesary. There is a timing chain tensioner, which you will simply push back in to its body. once you do that, there should be a small hple somewhere on the body of the tensioner. That' sthere so you can piut a paper clip into it to keep the tensioner from coming out. Once you lock that in place you can remove the tensioner and than the timing chain.Once you get it all back together, just pull back on the pin and the tensioner will come out and put tension on the chain. good luck.