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TJ 4.0L Timing Chain Replacement

By Mike Forbes

 

Step 8:  Remove the alternator bracket as the belt tensioner is attached to it and is blocking bolts on the timing chain cover.  The two bolts holding the alternator in the bracket are 15mm, the 4 bolts holding the bracket to the engine are 14mm.


Step 9:  Remove the crankshaft bolt with a 19mm socket and be sure to remove the washer or you will not be able to remove the vibration damper.  Notice the washer is still on in this photo!



Step 10:  Using the harmonic balancer remover, make sure the tip is on it it or it will destroy your crankshaft threads.  Note, I missed this part :(, I thought the end was bigger than the bolt hole, I was wrong and got lucky and figured it out before I did much damage to the crankshaft threads.  DOH!  Read all directions on tools you are not familiar with!!!  Remove the vibration damper with the remove and set aside.


Step 11:  Remove the the bolts in the timing cover, most of them are 10mm and there are two 16mm bolts, and four 11mm oil pan bolts.  I use a piece of cardboard so I know where the bolts go.  Just stick them through the cardboard as you take them out in the same position.  Strangely on mine 1 bolt was missing, it had apparently been taken apart before and not put back together correctly.  I found the bolt stuck in some engine grease on the block, very strange.

Step 12: Slide the cover off. Note the chain guide likes to slip out. Just make sure not to lose it.


Step 13:  The timing marks need to line up on both the crankshaft and the timing gears before you can remove them.  You can see them in this photo near the edge of the gears, they are 2 lines.

I had to slide the vibration damper back on just a bit to turn the crank to get the timing marks to line up.

Step 14:  Once lined up remove the camshaft bolt and washer with a 16mm socket.
 

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