Whining engine
This picture is of the BMW 330i.
This BMW 330i had developed a whining noise that only stopped when the auxiliary drive belt was removed.
As the belt drives the water pump, along with the alternator, power steering and air condition, as well as running around a couple of idler pulleys, there were quite a few possibilities of where the noise was coming from.
Stripping off the cooling fan and cooling, along with the air filter housing, gave plenty of room to access the problem area.
With the auxiliary belt off, all of the individual pulleys could be spun. Although the water pump was showing slight signs of wear, the bearing appeared to be smooth.
The tension pulley was showing a roughness when spun. The alternator felt smooth when the pulley was spun by hand, but this is not always a guarantee that all is OK as things can change when it’s under load.
In the end, it was discovered that it was indeed the alternator causing the problem when under load. We also took the opportunity to fit a new water pump and tension pulley, both of which needed replacing anyway.
No comments:
Post a Comment