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Old 08-06-2014, 01:35 PM   #1
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Default Source for bellhousing bolts?

I haven't had much luck with this. Last time I did an engine swap, i busted *two* bellhousing bolts. This time, I've got an m12x1.5 rethread chaser (not a tap, i understand the dangers there!) to clean the threads out from the block before I try to torque them.

All the same, I'd like to get some brand-new steel on there. One of the ones that broke last time broke in the block, not sticking out either end, and it's nearly impossible to recover. The other one fortunately came out with vise grips.

Anyway, I have hunted down thread measurements and I know what size bolts I'm looking for. The larger bolts are m12x1.5x60 and x75, with 20 and 40mm shanks.

If I figured this correctly, that means they have 35-40mm of threading. A typical partial-threaded bolt from fastenal or similar has 26mm of threading. That's a big enough difference that I don't want to order and find out it's a no-go. Also, the best I can do with fastenal and similar is a cap screw and a washer - they don't make m12x1.5 flange bolts.

Anyone have any ideas on this? Dealer doesn't sell them, said "it's a standard bolt" - not so in my experience. Maybe I'm paranoid, but I really don't want to use the remainder of my bolts or get junkyard bolts after having them snap so easily. (Yes, I used a torque wrench and did so correctly...) Any input appreciated, especially helpful input. Thanks.

Also, any idea if buying fully threaded bolts would hurt anything here? I could easily do that and a washer if it's kosher, it would fix the threading problem entirely.
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Old 08-06-2014, 01:42 PM   #2
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Contact partsgroup.com
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Old 08-06-2014, 01:42 PM   #3
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Thanks, but I'm trying to source new bolts.
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Old 08-06-2014, 03:08 PM   #4
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Just in case anybody else has this problem:

This youtube video has the thread specs: youtube.com/watch?v=nDDPAMwAiqw You need m12x1.5x60 and x75mm bolts, but the threading needs to be longer than a standard partial thread (35-40mm instead of 26mm)

Rosenthal Mazda has them, just not online. If you call them up, they can find a part # that supercedes the old one, and with a little digging, they'll get them to you for $3.60/bolt.
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Old 08-06-2014, 04:55 PM   #5
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Guys, use the Mazda parts diagrams, found in many places, including .pdf files from Mazda Motorsports Development. This diagram is not from them, but diagrams like these will allow you to order anything for the car, just type any one of those part numbers for bolts into a Mazda parts website, and they pop right up, for cheap too.

Just FYI so you don't have to rely off of calling someone, although it does show Rosenthal's customer service.
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Old 08-06-2014, 05:29 PM   #6
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That is good to know, I should have thought of that. Still ended up being the same price, fortunately.
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