Join Date: Jan 2002
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12mm Bolt For Motor Mount on 4.0L Swap
I know the rear hole for the driver's side motor mount is 12mm fine thread but I can't get a 12mm bolt to fit. I tried both 1.5 and 1.25 fine threads but the hole is pretty rusty and the threads are gunked pretty bad (even more so now that I tried to jam the bolts it!).
Anyways, I have access to hundreds of 9/16" fine thread taps and the proper pilot hole for the tap is 1/2". However, after the threads are cut, this would be a little bigger than the 12mm hole and I don't wan't to drill into the oil passages in the block. What did you guys use and/or do you think the casting is thick enough for the slightly larger hole?
Thanks in advance - I think it will be fine and am just having some pre-install jitters. I just inspected the bottom end of the engine and everything lools great so I don't want to screw it up.:bangtard: