88 FXR - Is this case toast?
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Joined: Jan 2017
Posts: 74
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From: Southern NH
Any recommendation on what temp to heat it to (or not exceed)? I'll give it a try, couldn't hurt..
HDF Community Team
Joined: Dec 2005
Posts: 5,422
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From: NC USA
To remove the pinion race (just below that bearing) you heat the case half to 275-300f in an oven. But I sincerely doubt you'll ever get it to that temp with the cases assembled without getting the area in question overheated and really damage the case. If you're worried about it, just go over it with a heat gun or a small butane torch. If there's a crack there, the heat will draw oil out of it and you'll see it 
I'm sticking with my first thought especially after you cleaned it all up - run it, don't worry about it. There are certainly people on here more versed in metallurgy than me, but doubt that many, if any have seen the insides of more Evo cases than myself... not bragging, just saying.
I'm sticking with my first thought especially after you cleaned it all up - run it, don't worry about it. There are certainly people on here more versed in metallurgy than me, but doubt that many, if any have seen the insides of more Evo cases than myself... not bragging, just saying.
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Joined: Jun 2017
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From: Granville New York
Theres a spray dye you can use to see if there are any cracks. It's a two part deal, if I remember correctly it's only been 30 years it's a red dye spray then followed by a white and any cracks show right up in dark red. There's gotta be something like that still available. I'd do that before I went to heating them...but they sure look like they're gone in the second picture.
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Joined: Mar 2020
Posts: 659
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From: Sierra foothills
Spot Check from welding supply stores. Red dye and a white powder developer. There is also a special cleaner. Years ago it was trichloroethylene. Don't know what they use now. Spot Check will show any cracks
Last edited by tdrglide; Jan 27, 2023 at 10:28 PM.
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