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It does appear that the unit was overloaded, but all the up stream components that actuate it were in fine condition..
It appears that the tensioner wear pad may have worn and then been ripped off and that created the tensioner to operate at an odd angle that could have made it break..
An oil sample could seek out the wear materials from the tensioner pad in the oil and then if the chain is going metal on metal before a failure the elements of the tensioner would be in the oil as well..
Its a long shot, but we are already observing so many oil samples its just one more thing to add during analysis.
The newer tensioner being thinner with the plastic contact patch doesn't help anything.
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