Hi,
Just changed the alternater drive belt on my wifes cinq, but I now have severe bearing noise ( I believe its the bearings anyhow) I am not sure if its the water pump or the alternator. How can I check as Its hard to decide which it is by just listening.
Is there any way of lubricating either or both bearings whilst in situ.
She has apparently heard this noise ( nowhere near as bad as now) very slightly before but it went away quickly, and reapeared occasionaly.
Any ideas PLease.
Trev

Which engine is this?

Sorry should have said.
Its the 997 engine on a r plate cinq

Disconnect the alternator belt and listen if you can still hear the noisy bearing then it will be water pump but if you cant then it will be alternator.

Sorry Bandido but i am confused. But thanks for the reply.
Let me make sure that I have got this right.
The alternater belt fits around 3 pulleys 1 the crankshaft 2 the alternator 3 the water pump.
Therefore 1 belt is supplying drive to the 2 other components.
I dont see how taking off the belt will still allow the other component to be driven and therfore allow me to work out whats making the noise.
I am probably being thick so if poss could you clarify.
Thanks again

you sure the belt isn't too tight? thats one way to kill the bearings. Get a mechanics stethoscope on it to try locate the noise.

Failing the stethescope, a peice of wood or a long screwdriver between ear and alternator or water pump will do the job.

Thanks for the replies guys,
Off to my garage I go.
Trev

lastagain said:

Sorry Bandido but i am confused. But thanks for the reply.
Let me make sure that I have got this right.
The alternater belt fits around 3 pulleys 1 the crankshaft 2 the alternator 3 the water pump.
Therefore 1 belt is supplying drive to the 2 other components.
I dont see how taking off the belt will still allow the other component to be driven and therfore allow me to work out whats making the noise.
I am probably being thick so if poss could you clarify.
Thanks again

Click to expand...

Sorry i didnt think before writing , yeah the belt will be on all three components so it wont do much good taking off the belt so yeah best bet would be a long screwdriver or bit of wooden broom handle/dell stick if you dont have the stethoscope as suggested

Cheers for the reply though Bandido