6bt5.9m SBMAR tensioner bouncing

[davebetsy]

The tensioner is 7 years old. Probably 2000 hrs. Both engines do the same thing. Is this normal?

Thanks, Dave

Topic

[davebetsy]

I bought it of you guys as part of the belt mod you recommend.

[Tony Athens]

This is a Cummins Part–Not a SBMAR part —- made by Dayco or some other manufacturer.

Replacement time at 3000 hrs  (in a marine environment) = I would 100%  if a single engine vessel——-Belt, Alternator & idler too–And I’d look at / check  the coolant pump too.. All spin at 2.5X engine RPM–Think about it.  Do the math at 1800 avg RPM— 800,000,000 + rotations ??

[davebetsy]

Is it normal to have to replace the SBMAR spring idler at 3000 hrs?

[Tony Athens]

Spring Idler vs Idler pulley

Let’s be sure we are all on the same page here.

[Rob Schepis]

Just identifying it for others. 

[davebetsy]

Rob, what are you telling me about the #8 bolt?? I bought the SBMAR modification kit for the new tensioner.

[Rob Schepis]

Idler bolt grade 8

[davebetsy]

I already did the upgrade. It’s an SBMAR tensioner sioner that’s in question.

[John Hobby]

Hey Rob,

A good time for the idler pulley upgrade from Tony also huh?  I did both last May on my 6BT.  

[Rob Schepis]

Looks worn to me, 2,000 hours, I’d replace them.  Here’s a running engine video for comparison

[Author]

Replies