1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Crossmember Stud- Why so tight?

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Old 07-10-03, 08:56 PM
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Crossmember Stud- Why so tight?

This is somewhat trivial, but after painting my front Crossmember (K-member, etc.) I'm putting it back under the car and I can't seem to tighten nuts onto the four studs. I can get the nuts on about halfway easily and then they get REAL tough to turn. I don't believe Im crossthreading them- are these supposed to be really tight compression fittings or something? Just in case I grabbed the wrong 4 nuts, does anyone have the thread count of these studs? Thanks, as always. -Adam
Old 07-11-03, 03:25 AM
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I think they're crimped at the end, or have nylon or something. I think they're supposed to be hard to get on, so hopefully they'll stay on with road and engine vibrations.
Old 07-11-03, 09:47 AM
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make sure you didnt strip the tread when you took them off. me and coldy13 just took off his tranny and stripped the bolts. he got new ones from a mazda dealer and the went back on pretty easy.
Old 07-11-03, 01:26 PM
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I only stripped one of the threads. When I took out one of the bolts, somehow part of the threads from the hole became fused with the bolt. I just ran a tap through the hold and used new crossmember bolts. Now they're fine. A mazda dealer charges $4.50 for each crossmember bolt. Or, if you know the thead pitch of the bolts you're using, the right pitch is M10 x 1.25. When I put them back in(yesterday) they went in easy until the last little bit, so I don't think it's right that they get very hard that soon.
Old 07-12-03, 02:29 AM
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M10 x 1.25 is correct for tranny mounting hardware. I just messed with mine today. Got 'em all clean and they all went on easier than they came off.

Do yours have a nasty old oil and sand buildup in the threads?
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