Engine had been recently serviced with a new alternator belt but it still squeals under high load. Problem is the 175 Amp Iskra/Mahle alternator with it’s solid pulley is too much for the 6PK belt running.
The alternator manufacturer fitted an 8PK solid pulley but engine mariniser runs it with a 6PK belt without the wrap achievable in other applications where idler pulleys/tensioners are used. Symptoms are chirping belt, need to frequently retension/replace and black belt dust. The 6PK freewheeling pulley I fit solves the issue.
Alternator bracket on the engine has to be modified to get correct alignment and everything shimmed to suit.
Customer can’t believe the difference and says it’s like a different engine.