Volvo KAD32 Engine Belt failure and lack of power

[amatas08]

Hi All

I have a Volvo KAD32 in a 24ft boat. On the first outing of the season the battery light came on on the dash and went into alarm. On closer inspection it was found that the primary engine belt had failed. We replaced this belt (checking all pulleys when replacing it).

We then put the boat back in the water for another run. The boat seemed fine at first and was working well at low speeds. It revved up as normal and supercharger kicked in. I then slowed down due to traffic. when I went to accelerate the next time i had no power and could not get above 1000rpm. I continued at low speeds and it was working fine. Tried turning off and on the boat and resetting supercharger speed controller reset but could not get above 1000rpm, this then started to decrease and i could not get above 500rpm. After about an hour of this the battery light came on and went into alarm. I check the primary belt and once again it had snapped. I had a look at the engine before this (i.e when there power was low) and did not notice any belt issues.

I plan to replace the belts again, but if anyone has any suggestions to the cause of the issue, or if the two issues are linked?

Thanks

[paintman]

Something that the belt runs on or drives in the process of seizing & applying a braking effect?
Belt being overstressed/overheating & then failing.

[beamishken]

Sounds like supercharger seizing you should be able to spin the front part of the clutch easily with the engine off. Did one recently & the inside of one of the intake hoses has a perforated aluminium sleeve which was breaking up & bits were intermittently jamming the supercharger, it was lucky it didnt grenade the engine to be honest but it must have only been small bits making their way into the intake