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Micha
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Joined: 10/12/2007
Posts: 414

While installing a new rear crankshaft main bearing I warmed it up and maybe exaggerated a bit, however after pressing it to place, now I see that its outer race color is golden yellowish. I recall that extracting the old one was a pain in the you-know-what, and was accompanied by destruction of the oil slinger.
Should I be worried about this color change? Did I interrupted the heat treating procedure of the bearing? Must I go through the extracting procedure again?
I assume it was heated to about 200-400 Celsius. Its hard to tell.

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Michael Steinmann
R51/3 1952
Engine Nr. 529466

jimcarrr100rs
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VBMWMO #9590
Loleta, CA
Joined: 10/13/2019
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I think you are OK. If it had

I think you are OK. If it had turned blue you might have trouble.
How did you heat it?

Micha
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Thanks. I did it with an

Thanks.

I did it with an electric hot plate.

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Michael Steinmann
R51/3 1952
Engine Nr. 529466

Twocams
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Joined: 03/16/2014
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You should be OK. Guess you

You should be OK. Guess you haven't got a book yet? Some Items they suggest putting in the freezer to (shrink up some). You don't have to go that hot, as you found out. I have a used slinger, replaced mine with my rebuild. U pay shipping from Oregon you can have one of them for nothing.

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Twocams
92 R100RT/69 R69S
2004 Aprilia Atlantic 500cc single cylinder Scooter
83 Honda V65 Magna, fastest production bike in1983

Micha
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Posts: 414
Thank you. The freezer tip is

Thank you.
The freezer tip is well known over here Wave

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Michael Steinmann
R51/3 1952
Engine Nr. 529466

Captonzap
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Posts: 78
another trick

Micha wrote:

Thank you.
The freezer tip is well known over here Wave

That takes care of the cold, so next time you use the hotplate to heat a bearing, place a few drops of oil on the bearing, and when it starts to smoke, it is about 450 far,+/-. That is not hot enough to change the temper in the races.

CZ

Micha
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Thank you! That's a nice tip,

Thank you!
That's a nice tip, I will remember it Batting Eyelashes

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Michael Steinmann
R51/3 1952
Engine Nr. 529466

Micha
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Good people over here

Twocams wrote:

You should be OK. Guess you haven't got a book yet? Some Items they suggest putting in the freezer to (shrink up some). You don't have to go that hot, as you found out. I have a used slinger, replaced mine with my rebuild. U pay shipping from Oregon you can have one of them for nothing.

Twocams wrote:

You should be OK. Guess you haven't got a book yet? Some Items they suggest putting in the freezer to (shrink up some). You don't have to go that hot, as you found out. I have a used slinger, replaced mine with my rebuild. U pay shipping from Oregon you can have one of them for nothing.

Thank you! That is kind.
I already bought one over at Mark Huggett Smile

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Michael Steinmann
R51/3 1952
Engine Nr. 529466

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