The noise is probably a crushed lifter. It really can't be fixed as it would have to essentaially have the motor torn down to replace it.
It will still run okay for a while even with the crushed lifter. It is just not lifting the valve as much as it could.
You should be able to run it for a while if you can get used to the noise.
Monday, March 26th, 2012 AT 10:49 PM