8.1 Volvo Penta keeps breaking serpentine belt

[Cobie105]

I have a 2010 8.1 375hp engine with 220 hrs that has broke 2 serpentine belts at different speeds in the last month. When this occurs of course the engine overheats and the alarm goes off. Obviously something is causing the belt to break. Has anyone had this issue? Any idea what might be causing this problem?

 

[Lou C]

When the engine is running watch the crankshaft pulley and see if it’s wobbling if so the harmonic balancer may need to be changed; then with the engine off lay a straightedge across the crank pulley and all the other pulleys one at a time to check alignment. Lastly check idler pulleys and tensioner pulleys for roughness and play and the same with alt, p/s, and water pump bearings.