I recently snapped my timing belt, and everyone has been saying that ls motors are zero tolerance and that the pistons probly bent some valves. I just started working on the timing belt and was wondering if i should just take the head in to a machine shop and get it done or if i even have to worry about it? I also heard that this is common for integras. Is there anyone who has had the same problem and if so how many valves did you have to replace? What was the cost?
What other parts should i replace besides the water pump?

 

I bought my LS integra with this problem, broken timing belt, it didnt do **** to the vavles. I just put a new Timing Belt and water pump and the car started right up. It also depends on how high the engine was revving... ie low R's or High R's. It's about an 8 hour job (for the first timer). If you are expereinced then there really isnt a reason for this thread. Good luck.

 

more then likely your valves are bent, happened to my old prelude 2.0 SI engine before. Bent 12 valves out of 16 going about 35mph. Good luck.

 

Correct term is "interference" rather than "zero tolerance". Yes your teg has a interference engine, valves and pistons share some space however at different times. As long as timed correctly (via timing belt) they won't touch, when the timing belt breaks (or skips teeth sometimes) and there are some valves open those valves stay open and the pistons crash into them. Result bent valves. There is a possiblilty that all the valves were closed when the belt broke so the piston will not hit the valves.

 

I would replace the tensioner while you at it...and depending on the mileage of your motor check out the oil-pump as well. Good-luck