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Caution: Incorrect removal or installation of the timing belt can result in damage to internal engine components.Timing Component Alignment Marks
Check that the "OT" mark on camshaft sprocket aligns with "OT" mark on rear cover.
Check that the crankshaft is at TDC.
Check that the distributor is pointing to #1 cylinder.
Also mentioned with engine out mark on balancer.
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As for actually making the change to bring everyting back to where is should be, you will want to be sure the crankshaft is set and and pointing exactly to the mark.
This should place the number 1 piston to Top Dead Center of the Compression Stroke. At this time, you would begin to verify that the Rotor is pointing to the number one tower and be sure that the plug wire on the cap is leading to number one cylinder.
If things are out of sink, then you'll need to get the crank and cam back into alignment then and verify distributor alignment..
If not able to align markings:
Mark on distributor must align with mark on rotor arm or camshaft position sensor cover.
This is how you verify the belt tension is correct. When adjusted too tight they can be very noisy and fail rapidly. Too loose and they can jump time.
As you can see by the last steps above, it is entirely possible that the belt and tensioner were not properly adjusted, and the cam/crank did not stay in their correct relationship with each other.
Be sure to be careful when moving the cam back into time with the crank so that you don't have valves come into contact with a piston. Don't be afraid to pull the spark plugs and look down in the cylinder and move the pistons down a bit while you move the cam where you need it to be, and then move the crank back to TDC. Then reinstall the belt, and verify the dist. rotor is pointing at number one cylinder TDC compression stroke.
I hope this information is what you need