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I have a 1995 mazda familia. Ive changed my alternator belt twice myself. On both occasions the new belts lasted around 3 months then breaking. can you please tell me the best way to replace them and how loose or tight it has to be.

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Hi, to me it sounds like belt has been put on to tight the best way of measuring how tight the belt should be is once the belt is on and you are getting it tensioned up make sure that at the longest run of the belt you have about half an inch of play so press or pull on the longest gap in the belt. i mean the longest run from one pulley to another just press the belt down and you should have it so that it flexes about half and inch then goes back to its original possiton so tension it so that you have half an inch of spring in the belt or even slightly more then you should find that the belt will last alot longer.

Dont worry if you think its not tight enough just start the car and if its slipping you will hear it squeling so if this happens tighten only veyr slightly but the recomended play is about half an inch this should then solve your probllem.

ps make sure the tensioner is tightend up properly as it can tighten itself if left loose so make sure its all the bolts are tight and you should have no problem.

The only other thing that could cause the belt to snap is if one of the pulleys have seized or is starting to seize so just give all the pulleys a few turns by hand and make sure they are all free to turn and you should find you will have no problems.

Let me know how you get on or if you need further assistance ok.

Many thanks for using fixya

Posted on Dec 09, 2009

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