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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:
- Loosen belt tensioner and take toothed drive belt off camshaft sprocket
Turn intermediate shaft sprocket with toothed drive belt in direction shown (arrow), until rotor arm aligns with markings for no.1 cylinder on distributor housing (toothed drive belt slides over crankshaft sprocket).
Mark on distributor must align with mark on rotor arm or camshaft position sensor cover.
- Place toothed drive belt on belt tensioner and camshaft sprocket.
|Note: ||For easier installation of the toothed drive belt; loosen belt tensioner lock nut only approx. one thread.|
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.
- To tighten toothed drive belt, turn tensioner with pin wrench (e.g. Matra Vi 59) in direction shown (arrow). Drive belt is correctly tensioned if it can be turned 90° with the thumb and forefinger halfway between camshaft and intermediate shaft sprockets.
- Tighten tensioner lock nut. Tightening torque: 45 Nm (33 ft lb)
- Rotate crankshaft two full turns and check adjustment.
- Check distributor housing and rotor arm markings.
- Install upper toothed belt protective cover.
- Before installing, clean distributor cap and check for cracks and signs of carbon tracking, replace if necessary.
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