Human hands caused that. If not some significant outside influence. Never seen one "jump" by itself.
regards
mech
Human hands caused that. If not some significant outside influence. Never seen one "jump" by itself.
regards
mech
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View my fuel log 2015 Mirage de 1.2 manual: 55.7 mpg (US) ... 23.7 km/L ... 4.2 L/100 km ... 66.9 mpg (Imp)
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View my fuel log 2015 Mirage ES 1.2 manual: 49.6 mpg (US) ... 21.1 km/L ... 4.7 L/100 km ... 59.5 mpg (Imp)
Just another bearing to fail. Keep it simple, then the unnecessary parts are not there to fail.
regards
mech
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View my fuel log 2015 Mirage de 1.2 manual: 55.7 mpg (US) ... 23.7 km/L ... 4.2 L/100 km ... 66.9 mpg (Imp)
There are two potential scenarios at play here, according the the course of this discussion.
1. Either the belt jumped during the downshift, or
2. It was mispositioned by a mechanic.
I am not talking about the potential mechanics error, but the belt tension scenario. Do you suppose a spring-loaded tensioner pulley might possibly prevent a belt from jumping?
I do.
Just a thought. I wasn't there to watch it happen - it's all speculation.
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View my fuel log 2015 Mirage ES 1.2 manual: 49.6 mpg (US) ... 21.1 km/L ... 4.7 L/100 km ... 59.5 mpg (Imp)
Also, the original post mentions that the symptoms (sound) started at downshift. I would think this marks the start of the problem, and thus clears the mechanic from fault.
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View my fuel log 2015 Mirage ES 1.2 manual: 49.6 mpg (US) ... 21.1 km/L ... 4.7 L/100 km ... 59.5 mpg (Imp)
I'm with Old Mech on this. I've had numerous cars without automatic tensioners and have never had any issues with them. I actually have had less issues with them than ones with auto tensioners.
Custom Mirage products: Cruise control kit, Glove box light, MAF sensor housing, Rear sway bar, Upper grill block
Current project: DIY Nitrous oxide setup for ~$100
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View my fuel log 2015 Mirage DE 1.2 manual: 47.2 mpg (US) ... 20.1 km/L ... 5.0 L/100 km ... 56.7 mpg (Imp)
Could it be a fried tensioner? The noise on downshift could be explained by higher RPMs.
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View my fuel log 2015 Mirage DE 1.2 manual: 46.4 mpg (US) ... 19.7 km/L ... 5.1 L/100 km ... 55.7 mpg (Imp)
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View my fuel log 2015 Mirage ES 1.2 manual: 49.6 mpg (US) ... 21.1 km/L ... 4.7 L/100 km ... 59.5 mpg (Imp)
I totally understand what you are saying, and I also agree with Old Mech's sentiments that it is an unnecessary complication to be avoided. In another sense, I also agree with Old Mech when he says:andBut what if a automatic tensioner would help avoid something like this happening? It jumped at the downshift, indicating a tension problem.
Just speculating. Worth the cost of admission.
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View my fuel log 2015 Mirage ES 1.2 manual: 49.6 mpg (US) ... 21.1 km/L ... 4.7 L/100 km ... 59.5 mpg (Imp)
Not one time in 30 years including everyone I knew in the industry did a belt spontaneously jump a groove.
regards
mech
__________________________________________
View my fuel log 2015 Mirage de 1.2 manual: 55.7 mpg (US) ... 23.7 km/L ... 4.2 L/100 km ... 66.9 mpg (Imp)