alright so i have a DX coupe with 143k miles and a couple weeks ago i was driving at night and i came up to a stop light. When coming up to the red light i threw it in neutral to stop and then when it turned green i revved it up to maybe 1500-2k and released the clutch too fast and stalled. When stalling hard i heard a big thump. i ended up having to tow it home because with no mechanical knowledge i thought it was something small. Well it ended up being the timing belt that snapped so yesterday as of 7/9/2021 i took the valve cover off and timing belt cover and saw that the timing belt completely snapped off in half. i was looking up YouTube videos and i really want to do it myself so i can learn about cars abit more since im 17.while in my searches of YouTube everyone does videos on replacing them but not any in depth videos on how to fix it if the belt snapped and threw timing way off so my question is how would i go by putting the Crank and valve pulleys back into timing without hurting anything ? Thanks in advanced

 

You do it the same way as when you replace the timing belt. People cheat and "don't move anything" when replacing the belt but you are supposed to set mechanical timing.

You move the crank to one of the two 90 degree positions. If you feel resistance lightly turning the crank one direction, reverse and turn it the opposite way until the lone tdc mark on the pulley is 90 degrees from straight up. This then lets you turn the cam freely to TDC position.

Finding the Factory Service Manual will be very beneficial to you for this job.

Also once you get the new timing belt on with the correct mechanical timing, you will want to do a compression test on each cylinder being at TDC. This may tell you if you got lucky and didn't have piston to valve impact. If compression is very low in a cylinder it usually means you bent a valve or two when the timing belt snapped.

 

thanks for the reply, so my cam gear when i took the valve cover off is at TDC already, The crank pulleys 1 hash line is about an inch counterclockwise so does that mean that it barley rotated when the timing belt snapped or does that mean the crank did a full turn before coming to a halt ? would i just spin the crank pulley forward a bit and itd be in time ? then just slip the belt on and try cranking it ?

 

The lone hash mark (white hash mark) needs to be in line with the timing belt lower cover sights. The same ones you use to set ignition timing. Once belt is on and the cam and pulley are both in line for TDC, then you do the tensioning sequence of rotating the crank counter clockwise (CCW) until 3 teeth of the belt roll onto the cam gear, hold and tighten tensoner bolt to I think 33 ft lbs if I remember correctly. After that then you rotate the crank CCW until the belt does two or three full rotations and then check to see if the cam and pulley still line up to perfect TDC.

That is the basic process for setting mechanical timing.