1996 Toyota Corolla engine rattling noise

1996 TOYOTA COROLLA
280,000 MILES
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MARTINFROMSYDAU
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hi, i have 1996 1.6L corolla AE102, it's been great car to me for almost 10 years. i experience rattling noise when exhilarating , but it's only when engine get's hot, that's approx after 10min, it sounds like pinging rattling ringing noise, which is the the worse at gear downshift between 70km/h and 80km/h ( it's a 3 gear automatic with approx 280 000km) i have changed the timing belt around 2 months ago that's when that noise escalated to a loud worrying level. old belt was stretched approx 5 degrees ahead ( crankshaft was ahead of camshafts 5 deg. ) when the car is cold , first few minutes or km, there is no noise, car is smooth , quiet and strong, but transmission doesn't change gears for those few minutes, it's still 3000rpm at 80km/h. if this noise is from valves that are rattling around, i guess i should measure the shim distance from the camshaft when the engine is warm (instead what is recommended in the Haynes repair manual - at cold engine) if it's something in the transmission - it's out of my abilities. thanks , martin.
May 31, 2013 at 2:48 AM
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HMAC300
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check yoru cam belt tensioner if automatic tensioner, that should have been changed same time as belt.
May 31, 2013 at 6:43 AM
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MARTINFROMSYDAU
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Thanks hmac300 , i did that as well, it wasn't the belt tensioner, trying someones elses advice, i took off PS belt, aircon belt, and alternator belt, the sound was still the same, so i took off ( mechanicaly) the alternator off the hinges to start with, and it was perfect, as soon as the alternator just touched the hinge , it started again, even without belt on it. so i guess this time it's alternator bearings and hinge that lost one of bush washers. after putting it all back together, ( store didn't have those bearings in stock) i can drive at least knowing that it's nothing that would suggest engine life coming to an end. thanks everyone. :)
Jun 3, 2013 at 3:25 AM
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