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MG TD TF 1500 - dynamo bushing

Hi everybody,
The rear bushing is supposed to be porous bronze.
I poured some oil on it through the oiler hole. 2 days later the oil is still there and the bushing remains dry inside. Do I have the right bushing ?
Other information the shaft is a bit worn (14.8 mm) and the bushing is not (15 mm).

Laurent.



LC Laurent31

According to all I've read, the bushing should be soaked in an oil bath for a couple of days before it's installed, as long as you have the porous bearing. PJ
PJ Jennings

Or, you place it on your thumb, fill the ID with oil until the oil “crowns” and squeeze between your thumb and finger. The oil will ooze through.

Regards, Tom
tm peterson

There is a wick in there on mine. I just oil the wick and it oils the bushing.

Bruce Cunha

AS Bruce writes I believe a felt "oiler" was in the originals beneath a brass threaded cap.The oiler should be soaked for 24 hours in oil and the felt then lubricates the bearing. It obviously should be part of your regular service check. I have some available if interested £20 plus postage. See Moss PART NUMBER: 147-900

JK Mazgaj

As Bruce mentioned, there should be a spring loaded felt wick in the lubricator, however the workshop manual recommends using high melting point grease NOT oil.
Oil will find its way into the generator and contaminate the brushes and commutator.

John
J Scragg

The bushing should be an "Oilite", or porous bronze. If it is not, you will need to grease it from time to time.
Steve Simmons

Thanks all.
But maybe I was not clear enough. Of course there is the wick, the oiler, the soak procedure... I know all that. The photo is just a test to validate the bushing is porous or not.
And I m wondering if my test is valid to say that my bushing is not porous.

Anyone has performed the same test on a known porous one ?

Tom's procedure let us suppose a very porous material.

Laurent.
LC Laurent31

Impossible to tell for sure without a closer inspection, and it will also depend on how many miles you've driven. But generally speaking if the oil isn't going through then it probably is not an Oilite bushing. If you haven't driven the car then the oil might not go down very fast. The original spec was actually for melting grease, not oil. Using oil you may need to lubricate the wick more often.
Steve Simmons

Laurent
To check it, wipe it nice and dry inside, then fill that oiler hole to the top with oil, then using your thumb press onto the hole and pressurize the oil, put as much pressure as you can on it and after a min. or so there should be oil on the inside of the bush if it's a proper oilite/porous bronze bush-
If it's a new bush that you've only just fitted it should have been filled with oil before fitting
Other option is if it was a pre filled one and the oil in it is thicker,stopping your oil from passing through by gravity
Try the pressure trick and see what you've got-

willy

The pic shows pressurizing the bush but you should get the same result pressurizing the oiler hole and pushing oil into the inside instead



William Revit

If you have the slightest doubt about the bush, just change it, they are available and cheap. At the same time you could also replace the brushes.

John
J Scragg

Thanks Willy. It works. My bushing is porous.

Laurent.
LC Laurent31

This thread was discussed between 26/10/2022 and 28/10/2022

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