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Car Forum / Mazda / Mazda Miata / December 2004More new owner questions
I got a great deal on a '93 with a clean carfax record but unknown maintenance history (and it was such a good deal I wasn't concerned about this). I'm planning some major PM, and have a few questions: I'm planning on changing the timing belt (the car's got 108,000 and I don't know if it's ever been changed). Any recommendations on what else ought to be done while I have it apart? Recently, I've noticed that the battery light will come on, and after awhile go off. Alternator belt is in good shape and tensioned properly. What else should I look at? I just barely failed the NOx emissions test. I was planning on replacing plugs and filters this weekend anyway - any other suggestions that could improve my chances? Thanks in advance! Nick Recently, I've noticed that the battery light will come on, and after awhile go off. Alternator belt is in good shape and tensioned properly. What else should I look at? The alternator brushes may be worn. At the mileage you mention, the timing belt should be checked and most likely changed. Along with the belt, the tensioner and idler should be checkd for bearing wear, and replaced if needed. The water pump is also considered to be a likely canidate for replacement. (Since everything gets taken out of the way to change the timing belt.) Other items are the camshaft seals. These are usually skipped on the first timing belt change. (If it was even done.) >I got a great deal on a '93 with a clean carfax record but unknown > maintenance history (and it was such a good deal I wasn't concerned about [quoted text clipped - 19 lines] > > Nick The crankshaft seal is a good candidate for replacement as well. Ken > Recently, I've noticed that the battery light will come on, and after awhile > go off. Alternator belt is in good shape and tensioned properly. What else [quoted text clipped - 38 lines] > Checked by AVG anti-virus system (http://www.grisoft.com). > Version: 6.0.806 / Virus Database: 548 - Release Date: 12/5/2004 On the NOx problem, check your timing, many people advance from factory 10 degrees btdc to 14 btdc (some even go to 18), this increases internal temps and NOx emissions pretty drasticlly. If when you check it, it's already at 10 degrees, you could hedge your bet with a temporary de-tuning to 8 or 9 degrees. It'll run like a dog but it's only temporary. Definetly go to 14 after test and use higher octane fuel if you start to hear any pinging (detonation) in hot weather. Good luck, Chris 92BB&T > The crankshaft seal is a good candidate for replacement as well. > [quoted text clipped - 46 lines] > > Checked by AVG anti-virus system (http://www.grisoft.com). > > Version: 6.0.806 / Virus Database: 548 - Release Date: 12/5/2004 |
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