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I guess I am confused by the two responses. My wife has a '91 Miata with the 1.6 DOHC engine. Is it an interference fit engine or not?? She has 59,000 on the clock right now and I am wondering if I need to hurry up and replace the timing belt and waterpump or can it wait a little bit. Are there special tools needed to replace the belt?? I am an audi tech by trade so I figured that nothing should really throw me for a loop but I thought I would ask those who have done it before. Thanks for your time.[/b]
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This is really a belated reply, but I dont know of any problems other than inconvienence that a broken timing belt on a 1.6 or 1.8 will cause. All the miata engines are non-interference.I will limit that comment to NA models, because I have no experience with NBs or NCs. and it assumes no performance modifications have been made that would reduce the valve/piston clearances. I would wait until 70k+ before worrying about it breaking, and I wouldn't concern myself about the wp until the second time on the timing belt. When you do do the TB however, I would suggest you also replace the camshaft and crankshaft seals as well as the valve cover gasket and CAS o-ring.