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Old 01-08-2021, 06:31 AM   #1
ThinkPad
 
Drives: Yaris XP9 1.3 '06
Join Date: May 2016
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Cold start noise: worn out alternator bearings? 2006 2SZ-FE

New year, new noises/defects.

https://youtu.be/t8LSnVCurLw

Cold starting the engine on a winter morning (2℃ / 35℉) produced this noise. I suspect this might be the bearings of the alternator? After the engine was warmed up a bit i didn't hear it anymore. I have driven around 40 mins on the highway and thus the engine was warmed up nicely. It ran smooth without any weird noises.
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Old 01-08-2021, 07:17 AM   #2
ex-x-fire
 
Drives: 2010 yaris 3 door hatch
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Some engines are noisy when they are very cold, you can remove the belt and try it out. Then listen to see if the noise is gone.
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Old 01-08-2021, 08:23 AM   #3
nortonfb
 
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Belt slipping
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Old 01-08-2021, 11:24 AM   #4
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Quote:
Originally Posted by nortonfb View Post
Belt slipping
Sounds plausible, as the belt was squealing a little bit a few weeks ago when the A/C compressor got engaged.

I will loosen the tension on the belt so i can rotate the pulleys etc. by hand to check them. And if those seem ok i will tighten the belt again.
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