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General E46 Forum
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Old 04-25-2015, 11:21 AM   #1
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Socket or t wrench for tap

I need to helicoil an OFH bolt hole. The tap is huge and wont fit on my twrench. Can I use a socket wrench or should I get a bigger t wrench?
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Old 04-25-2015, 02:52 PM   #2
invisible man
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Never use a wrench for tapping unless you want the first 2-3 threads of the hole to be oversize and out of alignment. T-handle only.

Last edited by invisible man; 04-25-2015 at 02:52 PM.
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Old 04-25-2015, 05:25 PM   #3
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Depending which hole it is, you might be able to get away with not having to coil it. The OFHG bolt holes into the block are blind, but (on my last car at least) they are drilled and tapped deeper than the stock bolts reach, about 10mm on the top two, 8mm on the middle two and 4mm on the bottom two.

I stripped the top left and in the end just got a washerless bolt from the dealer that was 5mm longer than stock (giving 7mm more reach total) and it torqued up and held fine.

You probably want to measure the holes in your block to be sure, you could use a straw, or you could use the long bolt in the stripped hole and measure how far you can thread it in, make sure to leave yourself with at least 2mm spare depth though.

OR, just put in a threaded rod in finger-tight till it stops and put a locking nut on the other end to hold the OFH on. Would probably want to loctite it in though to stop it backing out when torquing the nut on.

Good luck, I was glad I didn't need to tap it, let me know if you would like the part numbers of the longer bolts.
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