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Old 02-17-2018, 07:13 AM   #9
Anker
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Join Date: Sep 2016
Location: Stow, MA
Posts: 918
Garage
When the noise starts after warming up it is almost 100% certainly bearing knock of some kind. The bearings that typically will knock like that are the ones at the ends of the connecting rod. Time for a rebuild or engine replacement.

Lifters tick and pistons slap.
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