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Old 05-12-2021, 04:29 AM   #1
subiscoobie
Scooby Newbie
 
Member#: 518043
Join Date: Aug 2020
Location: Colorado,Europe
Vehicle:
many STI (3)04,08,14
Blk,Grn,BlK, Red, White

Default 08STI Broken T.Belt tensioner bolt

Hi. I have an 08 STI with a brand new 600HP motor with 3100km/1926 miles. I replaced all pulleys and tensioner with new parts. Tensioner was aftermarket. I was driving in traffic at low speed and car stopped abruptly. Tried to restart with nothing a couple of times. Had towed to mechanic, he tried to start and it started for 2 seconds and stopped, while belt was slapping and he pulled cover and found timing belt tensioner bolt broken. One motor builder said the bolt was either too tight or too loose? Mechanic said the hydraulic failed and caused the bolt to break?
I am guessing that I have 90% chance the valves are bent? If anyone could help me with possibilities of how the bolt broke, that would be great. I need to understand if the mechanic is to blame? Tensioner to blame? Bolt to blame?

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Old 05-28-2021, 09:05 PM   #2
Elbert Bass
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Member#: 283429
Join Date: May 2011
Chapter/Region: South East
Location: Down yonder.
Vehicle:
2016 Fuji Sunfire 03
Silver

Default

Are you sure the bolt is what is broken? Was it torqued to spec? You really can't overtighten a tensioner bolt until it breaks - it threads into an aluminum bracket and will strip the threads out of the aluminum bracket before the bolt will break.
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