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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 10-26-2019, 08:03 PM   #1
Rabrooks
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Broken cam head and sprocket. What caused it

Tearing down my engine and found this. Also found a spun rod bearing. 2013 frs 123k miles
What would cause it

Last edited by Rabrooks; 10-26-2019 at 08:50 PM.
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Old 10-26-2019, 09:00 PM   #2
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Was valve spring recall done?
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Old 10-27-2019, 12:58 AM   #3
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It could be a few things besides the common causes.
Some times it's due to poor metals, weak spots in the forging, machining, installation or just a bad luck.
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Old 10-27-2019, 01:07 AM   #4
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sumptin' got stuck. dat der stuckn' borked da cam geer.
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Old 10-27-2019, 09:25 PM   #5
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Quote:
Originally Posted by Rabrooks View Post
Tearing down my engine and found this. Also found a spun rod bearing. 2013 frs 123k miles
What would cause it
Did the spun rod bearing lock up the engine?


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Old 11-07-2019, 08:54 PM   #6
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Did the spun rod bearing lock up the engine?


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No, Turns out the bearing was bad but didnt hurt the rod or the crank throw.

The knock was coming from the broken intake cam sprocket.
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