I was given a 1998 Chevy Metro that the engine was bad in. I bought a used motor from a company and put it in the car (1.0 liter). It ran fine for about 10,000 miles and then the cam gear broke. I got a used cam gear from the company I bought the motor from and put it on the motor. When I put the timing belt on, it would not stay all the way on the cam gear, riding approximately 1/8 inch off. I was unable to find anyone who could tell me how to fix this. So I put it back together and drove it. The motor has approximately 5000 miles since I did this and the timing belt jumped a tooth. After taking it apart, it is obvious that the belt has been riding farther off the cam gear as the housing was full of fibers from the belt. Any ideas what could be causing this problem and what I do to fix it? Thank you.
From the piece I had left from the one that broke, yes it was. I called the company that I got the gear from and they said that it was from 1.0 liter so it should be the same. I tried putting a spacer behind the tensioner (found that suggestion on line) and that didn't make any difference. Asked all the mechanics that I know and no one had any suggestions so that is why I just put it together and drove it.
February, 13, 2012 AT 4:27 AM
Usually the crank gear has a flange washer to keep belt strate so it dont wander down there and this in turn keeps alignment with cam gear true. Maybe a defective belt or the tensioner got bent slightly in the mishap with cam gear?
February, 13, 2012 AT 4:39 AM
I will check the tensioner. I put it all together and it is on the cam gear but as soon as I turn the motor over, it starts to come off. It seemed to ride about the 1/8 of an inch but obviously after I buttoned everythng up it started to walk off more. You can see on the plastic housing where the belt was rubbing and started to rub a hole it it. Thank you but I don't think it is the tensioner.
February, 13, 2012 AT 6:07 AM
Generally speaking, it would take 1 of the 2 gears to be out of parallel to make belt drift. If the original setup was fine, what happened? And why did cam gear break?
February, 15, 2012 AT 2:43 AM
Only things different are gear and belt.
February, 15, 2012 AT 3:36 PM
Because I bought the motor from a company that gets them from Japan, I do not know what year the motor is for sure. There is a difference in belts between a couple of the years. I am getting one of each to see if that will make a difference. I have no clue why the gear broke. Like I said, no one that I have talked to has any idea what is going on, why the gear broke or why the belt doesn't ride properly. Hopefully the other belt will solve the problem. It is narrower but the same other than that.
February, 15, 2012 AT 3:44 PM
WITH A DIAL INDICATOR, YOU MIGHT CHECK BOTH GEARS FOR "WOBBLE"
THIS IS JUST ONE SET-UP IN THIS VIDEO---THIS WILL SHOW YOU HOW IT WORKS, EVEN THOUGH THIS IS NOT WHAT YOU ARE TESTING