hole in generator´s oilite bearing needed??

[Go Fleiter]

Hallo,

 I had reported from our Italy trip here (link, scroll down): the generator had failed loading and had developed sporadic bearing noises. After the car had been towed back home, I initially only had time to install a replacement generator and could only now look for the defective one. 

 

 The Oilite bearing at the rear end was completely gone, the shaft was flapping in the back plate and showed strong signs of overheating.

 

 The rear cover does have an oil pocket with channel (red/white in photo) to the bearing seat, but the bronze bearing has no hole from the channel to the shaft. I also haven't found any indication anywhere that you should drill a hole after assembly. I assume that none was drilled when refurbishing the generator either.

 

 

Question:

  Does the bronze bearing need to be perforated from the oil cup after assembly? The bearing material seems to me to be much too compact to allow oil to seep through.

 

 

Although the bearing noise had only been intermittent, I fear that the rotor may have damaged the windings. I have not been able to see this properly yet. In any case, he tore off the insulating tape wrapped around some of the wires (see foto in 8 o'clock position).

 

 

Next I will then have to look at the oil lite bearing of the spare generator so that its shaft does not suffer oil starvation too!

 

Thanks for help!

Greetings from Düsseldorf!

Go

Edited May 22, 2023 by Go Fleiter

[Eneto-55]

If it is a sintered bronze (oilite) bushing, then it doesn't require a hole.  But if the pores in the bushing are clogged, or if the ID has become 'smeared', then it will not allow the oil to flow through.  If it's just clogged, then there is a process of soaking it is hot oil that should clear it, but otherwise, it requires a replacement.  (Because if the ID has become 'polished' or smeared due to lack of oiling, then it is probably too worn to function as intended.  I think some here have replaced these with a "permanently lubricated bushing".)

Edited May 22, 2023 by Eneto-55

[desoto1939]

Oilite bromze beraring were an invention from Chrylser MoPar division. When they are original produced they are impregnated with oil under pressure. This is one of the reasons why you do not ream any of these bearing such as the pilot bushing bearing in the flywheel. The little grease cap will permit you to drop in a couple of drops of motor oil and this willthen lubricate the oillite bearing. Do NOT drill any holes inthe bearing.

 

Rich Hartung

[desoto1939]

here is some info on Oillite bearing and bushings:  Rich hartung

 

[Go Fleiter]

Porosity is the key word!

 

Maybe my bearings are not oilites!

I have 3 unused NOS, they have a completely homogen surface like polished and do not seem to provide the slightest permeability.

They seem to be far away from beeing able to hold any, not 20% of oil. Thanks so far, anyhow.

[Dan Hiebert]

Don't fret, "new" ones don't look porous at all, but they will indeed soak up oil.  They will not be slick or otherwise seem to even have any lubrication qualities.  Your NOS ones have likely been sitting for quite some time, you may want to check my reasoning whether this is necessary or not but doing the hot oil thing Eneto-55 mentions wouldn't hurt.  Some of the oil in them may have aged too much, or seeped out, or both.

[Go Fleiter]

Thanks for all these very helpful informations!

 

Edited May 24, 2023 by Go Fleiter