They are telling me i have a bent valve after replacing timing belt, i have a horriable roar sound and vibration. 3rd timing belt on this car being a female i am not trusting this solution w/o some other proof. I have no diagnostic papers showing me proof from this mechanic

If the belt broke while the engine was running, it is very possible you have bent valves. A compression test would confirm it. Bent valves won't let the cylinder build compression. Without compression the air/fuel mixture won't burn and so no power is produced from that cylinder. I would recommend the compression test. If all cylinders are uniformly low, check your timing marks on the belt sprockets- you may have gotten the belt off a tooth or two.

you are right to be suspicious of the answer that you got, the only way for valves to get "bent" is for them to come into contact with the piston(s).

the lifters are run by the cam, which is run by the timing belt, (which was just "replaced" by the shop) Renault is not the easiest cars to work on, but if it went to this shop for 90k "service", then they should have had the procedures down pat. Sounds like some-one is trying to "CYA" (cover their "you know what")

Sounds like the Timing belt broke while the motor was running, the engine would have died when that happened unless you busted a cam shaft. if the Timing belt was broken and it happened while the motor was running there is a 90% probability that you bent every valve in the head assembly from contact with the pistons.

Because your car has what is known as an interference engine one or more of the valves may have been bent when the timing belt failed resulting in a serious problem that translates to an expensive repair. What happens when the belt breaks is the camshaft stops leaving the valves in one position. The pistons keep moving long enough to collide with an open valve bending it. A compression test will tell the story.

I just had the same issue with a 1999 2500HD and the vibration got worse above 50 mph. Problem was resolved with a new driveshaft. Old one (aluminum) was badly out of true and the problem didn't really occur until I had the U joints changed - then bent driveshaft vibration was noticeable. New driveshaft resolved issue.

It sounds as though the timing may be off. The belt may be okay, but if the timing is off, it will cause the motor to vibrate. Also... if your car keeps chewing up timing belts, there may be a defect in the timing gears or belt guides causing the belts to fail. There is also the possibility that the timing belt is rubbing against the timing cover as well. If the car seems slow to accelerate, or just doesn't perform as it once did, and it vibrates at idle and when you accelerate, there is most likely a timing issue still, and you need to ask your mechanic what they can do to remedy a problem. I hate to say it, but there ARE bad mechanics out there, and although I do not know the one that you used, many techs that put a timing belt in a car and find out that they are off a tooth on the gear will not tear it back apart to redo it. It is a lot of work and they are getting paid once to basically do the job twice. They'll give it back to you and just hope you don't notice. I can't promise this is the case, but its food for thought. Wish you the best in getting the timing issue resolved!

Hello momma_green: My name is Roger and I will help you. The 2005 Chevy Aveo 1.6 engine is a interference motor. That means if the timing belt breaks.The valves will be bent. I have one in my shop now that the belt broke on it. Bent all 16 valves and damaged all 4 pistons. This is not a forgiving motor. I wish I could tell you good news but I cant. Should you need further help please just ask. Please rate the answer you received. Thank You for using Fix Ya. Roger

Check the engine mounting!

I had a similiar issue (2001 Leganza 112,000 miles) ran great then died. Broken timing belt also bent 2 exhaust valves. Bought the timing belt kit (includes water pump, tensioner and 2 pulleys), top end gasket set, 16 valve lifters (8 of mine had collapsed) and 2 valves on Ebay.I found all the procedure documentation posted on line andI did the job myself for about $325 in parts cost. Runs great now!

Moral of the story....change that damn timing belt at the recommended interval of 60,000 miles!

P.S. Your problem sound like broken teeth on the belt. I would suggest a timing belt replacment and then a compression check of a all cylinders to see if any valves were bent - Good Luck!

The Lanos engine are an interference engine. If you have bent valves, remove a plug wire one at a time and see if there is no change in the idle. My guess, one of them isn't going to change anything. That would be the cylinder that has the bent valves in. I had a Lanos in my shop with a broken timing belt and the head had several bent valves. I wouldn't be surprised at all if you also have bent valves.