Hi everyone If some kind person can point me in the right direction about my squeal on my alternator It’s not the belt it’s like the alternator is seized up if that is possible Thanks in advance John
Posted: Tue May 10, 2016 9:48 pm Post subject: Re: Noisy alternator? One other thing to check: make sure the back of the pulley isn't rubbing against the alternator body. Sometimes aftermarket pulleys do not stand up well to over-torqueing, then the rear half of the pulley starts to break away from the hub and rubs against the alternator body. _________________ this is what I found it was grinding the alternator with the back pulley Is this an easy fix or new pulley/alternator
Maybe just replace the pulley wheel and see what happens It looks like it’s been grinding the alternator housing
Mine had done the same, under the PO’s watch. I was blissfully unaware (no squealing) as it had subsequently been set correctly before I purchased. I had the belt changed and still there was no squealing. On an engine rebuild I was told that the alternator was likely reusable in this condition, but there was also play in the shaft (sorry, don’t know technical terms yet) so we are changing it. Maybe that play caused the grinding. I was shown that the shaft was moving forwards and backwards slightly - perhaps check yours for that. Sent from my iPhone using Tapatalk
I have had this also @iblaze had it. The worn alternator bearings develop end float and the pulley starts rubbing. The bearings are replaceable if you have a bearing puller, the puller tool plus bearings can be a lot cheaper than a new alternator. The stop gap I used was some 0.5mm thick shims off eBay - that go between the pulley and the front of the alternator. I measured the shaft diameter at the alternator face, found some that were a bit big inside diameter ? 14mm but as they are so light the off-balance is tiny compared with the rest of the rotating mass.
If i replace my 55 amp for a 75 amp do i need to change anything else like fuel pump? Sent from my SM-G960F using Tapatalk
That 75A alternator should fit without any trouble. Hang onto your old alternator - either you or somebody else can change the bearings on it and it will be useful to them. It will make the bus go slower though - by the time you look at various losses thats worth 0.5 to 1HP extra for the extra 25 amps
Usual stuff radio usb's also a 12v fridge freezer. The 75 amp is actually cheaper than the 60 amp. Sent from my SM-G960F using Tapatalk
I’d go for whatever was standard. My bus has electric power steering, electric windows, central locking, fridge freezer, radio, CD, DVD TV, water pump, power sockets, reading lights, leisure battery etc. And a standard 55amp alternator (type 4 engine).
I think the bearings are standard shielded ball bearings and the bearing puller kit is like one of these https://www.ebay.co.uk/itm/391773336857
Squealing alternators I've looked into mending...the bearing at the pulley end was seized, the whole thing spinning and wallowing out the aluminium it needs to be pressed into...unfixable.
The bearing is lightly pressed into the body of the alternator. If the bearing seizes that part spins and wears away the alternator (inside at the pulley end). If that happens it can longer hold a bearing and the alternator is junk.
