Quick question about tempered steel
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Quick question about tempered steel

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    Senior Member H20MOFO's Avatar
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    Default Quick question about tempered steel

    Does anyone knpw at what temp. you ruin the steel? Probably a loaded question. My thrust bearing rusted enough over the winter I decided to change it. Last time I put the shaft in the freezer overnight. Then put the bearing in the oven for a couple of hours....and she dropped on the shaft slicker than goose shit. I just don't want to hurt the bearing. Would 400-500 degrees hurt anything here? Yes I know I could have it pressed on...that would likely cost me a 12-er or 2...I am on a budget here.
    Another Hot Boat refugee

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    Senior Member Oldsquirt's Avatar
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    You're going to need to press the old one off, so why not just take the new one with you and have them swapped all at one time. Quick and easy. Personally, I would NEVER bake the bearing.

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    Senior Member SoldHondaBoughtHondo's Avatar
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    Quote Originally Posted by H20MOFO View Post
    Does anyone knpw at what temp. you ruin the steel? Probably a loaded question. My thrust bearing rusted enough over the winter I decided to change it. Last time I put the shaft in the freezer overnight. Then put the bearing in the oven for a couple of hours....and she dropped on the shaft slicker than goose shit. I just don't want to hurt the bearing. Would 400-500 degrees hurt anything here? Yes I know I could have it pressed on...that would likely cost me a 12-er or 2...I am on a budget here.
    Never used an oven...i use a hot plate for jap bike trans brngs all the time....i'd call 400 a good number...if it needs to be any hotter to fit, the fit is to tight or your shaft is funky.
    The amount of size reduction you get from freezing is minimal....maybe 80* temp change....and it could cause a problem sucking the heat from the bearing...shaft having more mass....
    And ya 'bake a bearing' isn't the best idea...get it warm and get it done...
    I used to install press on cam gears (gm 2.5) with a torch.
    Wipe a little engine oil on the hub, heat it with a torch until the oil smokes and stick it on...
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    as to what temp will "ruin" a bearing, not sure, but have been taught by a bearing engineer that around 275 degrees is on the upper edge that it needs to be preheated. i use a bearing heater set at 220 to install the bearings and feel that this is a much gentler method on the bearing than brutally beating or pressing them on. i think one should use great care to press the bearing on using a fitted tool to only apply pressure on the inner race and when installing the shaft into the suction housing only apply pressure to the outer race. keep the bearing surgically clean when installing. others will use their own methods these have worked for me. .02

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    Senior Member H20MOFO's Avatar
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    Quote Originally Posted by johnray069 View Post
    as to what temp will "ruin" a bearing, not sure, but have been taught by a bearing engineer that around 275 degrees is on the upper edge that it needs to be preheated. i use a bearing heater set at 220 to install the bearings and feel that this is a much gentler method on the bearing than brutally beating or pressing them on. i think one should use great care to press the bearing on using a fitted tool to only apply pressure on the inner race and when installing the shaft into the suction housing only apply pressure to the outer race. keep the bearing surgically clean when installing. others will use their own methods these have worked for me. .02
    I think it would be easier on the bearing as well. I am still haveing a hard time figuring out why it matters how the bearing is heated. Isn't the heat from my oven that same as a hot plate...or a bearing heater. Good to know on the temp thing...thanks btw.
    Another Hot Boat refugee

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    Quote Originally Posted by H20MOFO View Post
    I think it would be easier on the bearing as well. I am still haveing a hard time figuring out why it matters how the bearing is heated. Isn't the heat from my oven that same as a hot plate...or a bearing heater. Good to know on the temp thing...thanks btw.
    i too dont think that it matters if you use an oven or hot plate, either would be preferred over a torch as the goal is to evenly heat the bearing and not localize a hot spot. if using a torch had an old master show me to heat the underside of a steel plate for a heated surface and not use the torch directly on the bearing, i think any type of even heat is ok, dont laugh saw one old dude keep hot oil in a deep fryer, if it works for you.

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