Jump to content

Alternator noise, perhaps not alternator


Recommended Posts

Hello,

 

Cars (1.6 AEH, 2000 plate) started to make a worn out bearing noises that rises rapidly with revs - having problems trying to work out which bit it is.

 

Its not present if the car runs without the aux belt so isolated to something on that system - rather than cambelt.

 

the rapidly rising noises suggests its either the belt tensioner or the alternator, the other two pulleys (AC, PAS) are closer in size to the crank one. that and it doesn't sound like its coming from them.

 

The alternator (70a) turns freely, if i jam the vanes i cannot turn the pulley either way - is this likely the fault or would a 1.6 from 2000 not have a freewheeling type pulley. this seems to suggest it should turn on way? The pulley is of the longer type with the extra 'bit' (non flush as the presenter says).

 

the belt tensioner turns easily enough, certainly plenty of spring left in it. the belt runs happily, no bucking or anything.

 

turning the (manual) AC on doesn't change any of this nor does turning the steering wheel between locks.

 

i can't tell which it would be - does anyone have any suggestions based on the info above? The alternator is a GSF replacement from about 5 years ago. the tensioner is original. The belt is maybe 2 years old, maybe a little newer and looks fine.

 

cheers

 

toby

Link to comment
Share on other sites

if the alternator pulley is solid then it's likely the tensioner pulley bearing  you could take it off and try lubing it pry back the bearing shield with a needle  1 drop of oil and a lick of grease--see how it goes

Link to comment
Share on other sites

Try the trick my Dad passed on to me. Get a suitable tool like a long screw driver, run the engine, place the blade on the bits in question (obviously on none moving parts only) and then place your ear against the end of the handle. It will work a bit like a stethoscope and you can pin point the noise much easier than guessing. Do be careful about loose clothing, long hair or beard getting caught in any moving parts!

Edited by Leeboy
  • Like 1
Link to comment
Share on other sites

Hello,

 

Was the alternator, pulled it all to bits, the tensioner is a bit aged but works fine, the bearings are still all together. Pulled the alternator and its the bearings at the back (the bit behind the black plastic), replaced the whole thing. noise gone.

 

I didn't think to try the screwdriver thing - would probably have solved it without pulling the tensioner!

 

Anyway, Thanks for all input,

 

cheers

 

toby

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Community Partner

×
×
  • Create New...

Important Information

Welcome to BRISKODA. Please note the following important links Terms of Use. We have a comprehensive Privacy Policy. We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.