i got new lift rods for my 864 bobcat because they all bent to timming belt failure when i install all of the rods and crank the engine manualyit goes fine until i hit the valve on the left side of the cylynder theres a loud metal snap sound and it only happend on the left side of the cylynders if i install the righ side it works fine but as soon the left side goes on it happens again the timming belt is still on it just skipped a tooth didnt break. could the timming belt that is still on there make that happen if the timming off Thanks