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Old 11-02-2017, 02:53 PM
ngoma ngoma is offline
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Join Date: Nov 2009
Posts: 1,351
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I ordered the Time-Sert kit m12 x 1.75 x 30mm.
The hole is just under 30mm deep below the counterbore (on the one I measured, assuming they are all the same depth). The flange of the insert will probably stand at least 6mm proud of the counterbore base since the insert cannot be installed to the bottom of the hole. The included tap is not a true bottoming tap so cannot thread to the bottom of the hole.

Dremel should be able to cut off the protuding section of the insert.

Our drilling session attempt at extracting the remains of the broken-off bolt managed to get the drilled hole off-course by 1-2mm (toward the IP side)-- hoping there is enough slop in the gasket and head's bolt holes to allow for this when reinstalling.

One great tip from Time-Sert: Cover the block deck with packing tape (like that wide clear tape for taping up cardboard boxes) to make a kind of "dental dam" to protect the oil ports, cylinder bores, etc. from metal chips and other foreign matter during drilling and tapping operations.

That's where we are at now, after cleaning up the other bolt holes and the steam port holes that were packed solid around #5.

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1985 744 gle d24t
1985 745 gle d24t
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