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» Hello Spec Miata Community » Spec Miata Archives » Garage 2002-2009 » Frozen Rear Bolt in Knuckle

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Author Topic: Frozen Rear Bolt in Knuckle
Muda Verified Driver Made Donation to Website
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Region: WDC
Car #: #23
Year : 1991
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As I am doing the 99 hats and new shocks I figured it was about time I fixed the two rear frozen long bolts so if I bent one at the track I could replace it. Cut out the left rear LCA and the stub is frozen solid in the knuckle. Pulled it, soaked it with three different rust busters, heated it (MAAP), drilled one side and cut it about 7/8ths of the way through in the middle with a Dremmel. Still won't budge. Don't have a press. These knuckles are nasty looking but have no play. Any ideas? Is it better to get new ones or keep trying?

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Muda Motorsports
"We're all here 'cause we're not all there."

Bad Al Bell Verified Driver Made Donation to Website Series Champ
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Year : 1991
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New ones aren't that pricey

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Greg Bush Verified Driver
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Air chisel might poke it out of there. I know they can get moderately bent ones out pretty easily.

Muda Verified Driver Made Donation to Website
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Year : 1991
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Thanks guys.

Got the ds after about 2 hours of cutting and pounding. Doing the ps now. Hoping it's not as bad but I wouldn't bet on it.

Edit: The other one is locked up and is showing signs of the seal leaking. Time for new hubs.

[ 04-26-2009, 02:27 PM: Message edited by: Muda ]

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Muda Motorsports
"We're all here 'cause we're not all there."

davew Verified Driver Made Donation to Website
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You need an oxy-acetelyne torch, a good air powered impact and a 5 pound hammer.

Heat the bolt to cherry red in the exposed area of the knuckle. Using the impact try to spin the bolt. Once you get it spinning, hit the end of the bolt with the hammer. Keep it spinning and keep hitting. It will come out.

Using this method I have only had 1 bolt that I could not get out.

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planet-miata.com
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quote:
Originally posted by davew:
You need an oxy-acetelyne torch, a good air powered impact and a 5 pound hammer.

Heat the bolt to cherry red in the exposed area of the knuckle. Using the impact try to spin the bolt. Once you get it spinning, hit the end of the bolt with the hammer. Keep it spinning and keep hitting. It will come out.

Using this method I have only had 1 bolt that I could not get out.

+1

I am sure everyone knows but after heating this bolt to the point it's cherry red, make sure you replace it.

this method always works for us but sometimes while using the impact, we'll see the middle of the bolt actually twist.

new ones i think are around $8 from mazda.

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Muda Verified Driver Made Donation to Website
ComingToAMirrorNearYou

Region: WDC
Car #: #23
Year : 1991
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I got them out by cutting them, drilling the centers, heating them and driving them out.

Major PIA!

Thanks for everyone's advice.

--------------------
Muda Motorsports
"We're all here 'cause we're not all there."

   

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