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Duramax Fifth Generation: 2011-2016 (LML) Discuss the fifth generation (2011-2016) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.

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Old 10-11-2017, 04:33 PM   #1 (permalink)
jnlperformance
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No more decoupler....

Just figured I'd post it for the heck of it... No more decoupler pulley

Tensioner is fine sofar...

From what I have researched on the pulley it's supposed to help belt slip on shutdown and startup at the alternator, keeps from throwing the belt If the alternator locks up (don't know how that would work and I don't care to, I'll take my chances)... and it's supposed to help the tensioner (which is fine and if it's not, I'll go from there)

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Old 10-11-2017, 11:16 PM   #2 (permalink)
jnlperformance
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Looks like I have a slight jump in voltage in the gauge... checked it... sustains 14.53 volts now.

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Old 10-12-2017, 12:10 AM   #3 (permalink)
heymccall
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Five questions but only four answers
Who? You.
What? Alternator.
Where? Your truck.
When? Today.
Why? It just doesn't say.
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Old 10-12-2017, 12:25 AM   #4 (permalink)
jnlperformance
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Lol... why.... the decoupler seems to be a common fail point, and it's 107$ vs the 20$ standard pulley conversion... better than buying a new alternator too...

Figured the why would be obvious
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Old 10-12-2017, 12:27 AM   #5 (permalink)
jnlperformance
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And you cannot get the "correct" decoupler unless you order a factory oem alternator because the retention spring within is "calibrated" just for that specific system...

.... it all sounded like a great reason to just have a normal fail safe pulley to me...
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Old 10-12-2017, 12:50 AM   #6 (permalink)
heymccall
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Yeah, but what about your turbo dusting failure noise thingy?
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Old 10-12-2017, 01:01 AM   #7 (permalink)
jnlperformance
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I stated in that thread that it was not that or worse... and I'm damn glad...

I found what it was, the decoupler pulley... all is well...

Thanks for the hint at the pulleys... good call...

Tomorrow... heat wrapping or injection pump rebuild or both, have not decided
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Old 10-12-2017, 01:05 AM   #8 (permalink)
jnlperformance
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I looked up duramax blown turbo vids, sounds did not match, but neither did the idilers or tensioner... bad decoupler has a VERY distinct sound on the duramax.
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Old 10-12-2017, 01:06 AM   #9 (permalink)
jnlperformance
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.. and... I still blame it on the dust... it was filled with dust filled grease...
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Old 10-12-2017, 01:06 AM   #10 (permalink)
jnlperformance
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That and it was likely on it's way out anyway...

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