6BTA harmonic balancer bolts loosening

[Antonio Guzzo R.]

Hello!

The harmonic balancer bolts of  the 6BTA (CPL 1975) enginen keeps loosening after being tightened to the specified toque in the manual. This is happening in 3 different engines (same CPL). I think that the harmonic balancers are… out of balance and the vibration is loosenig the bolts, what do you think?

Topic

[Antonio Guzzo R.]

Hello Tony,

The obvious bet may be the mechanic, but it was supervised personally by me, and thightened to 96 lbs. Nothing out of the ordinary, all cleaned an lubed, everything original, including the pulleys.

I noticed that the belt tensioner on the engine with the loose bolts jumps a litle more than the one that did not lossened the bolts but nothing extreme.

[Tony Athens]

Bet the common denominator  is the mechanic, related to the  installation and with who is overseeing does not see or know what must be obvious. 

Cummins  bolts, all clean and well lubed, and nothing has been “after-marketed” ??

[Author]

Replies