eliZium
06-06-2005, 07:32
Good morning :)
(actually not so good - had a nightmare weekend trying to locate a strange knocking noise).
This weekend I did some minor tune up stuff, changed plugs, fluids, filters, camshafts, belts...
After putting it all back together again I noticed a strange 'knocking noise' at all RPMs which sounded like it was coming from the front of the engine.
I first thought that maybe after changing the cams it may be related to ignition timing being a bit out or the cams being timed incorrectly, but I was hoping not :)
After giving some more thought about where the sound was coming from I removed all the accessory belts and started the engine again - there was no knocking noise. *Phew*
I put the belts back on independently (except A/C as I've decided to remove the A/C anyway). The knocking noise was only present when the alternator/waterpump belt was in place.
I changed out the waterpump and the noise remains. If I slacken the belt until just before it starts squealing, the frequency of knocking decreases to 'intermittant'. If the belt is squealing then the knocking goes away.
My current feeling is that it is the bearing in the alternator that's shot... but before investing my life's savings in getting a new alternator from Nissan, I wanted to get some other thoughts on what else the noise may be?
Your thoughts greatfully received.
Chris
PS: does anyone know the part number for the alternator for an NA S15 (and also front main seal part number as it is a little leaky - my local Nissan dealership in Moscow claims to be unable to find part numbers) :)
(actually not so good - had a nightmare weekend trying to locate a strange knocking noise).
This weekend I did some minor tune up stuff, changed plugs, fluids, filters, camshafts, belts...
After putting it all back together again I noticed a strange 'knocking noise' at all RPMs which sounded like it was coming from the front of the engine.
I first thought that maybe after changing the cams it may be related to ignition timing being a bit out or the cams being timed incorrectly, but I was hoping not :)
After giving some more thought about where the sound was coming from I removed all the accessory belts and started the engine again - there was no knocking noise. *Phew*
I put the belts back on independently (except A/C as I've decided to remove the A/C anyway). The knocking noise was only present when the alternator/waterpump belt was in place.
I changed out the waterpump and the noise remains. If I slacken the belt until just before it starts squealing, the frequency of knocking decreases to 'intermittant'. If the belt is squealing then the knocking goes away.
My current feeling is that it is the bearing in the alternator that's shot... but before investing my life's savings in getting a new alternator from Nissan, I wanted to get some other thoughts on what else the noise may be?
Your thoughts greatfully received.
Chris
PS: does anyone know the part number for the alternator for an NA S15 (and also front main seal part number as it is a little leaky - my local Nissan dealership in Moscow claims to be unable to find part numbers) :)