How do you tighten the lifters on a Mazda MX3?
The motor on the Mx-3 is an overhead cam engine. Due to the nature of the Mx-3 overhead cam engine, the lifters never need to be tightened. There are spacers in between the valves and the camshaft that do wear out, and will need to be replaced every now and then(many miles may be accumulated before this needs to be done however). Any Mazda dealership, or Mazda certified mechanic can do this, as it takes special tools/knowledge to do so.
The lifters are also hydraulic and automatically adjust. If they are colapsed try using marvel mystery oil.