I have a 1998 Integra GS, about 130K. I don't know much about Acura's (or even Honda's) and had only had this one for about a year. My friend drove through a puddle (after I warned him NOT to drive in the rain) and the CAI pulled in enough water to hydro-lock cylinder one.
Great, I was just about to sell it and now engine rebuild time. Long story short, only the rod was bent (and twisted), the bearings, piston and cylinder looked fine. I still went through with a "compete" rebuild; one new rod/piston, rings, bearings, seals, head tanked, pressure checked and decked.
OK, now I am reinstalling and find all but the solid rubber (upper/driver) motor mounts are toast (as in webbing cracked or completely torn). I didn't think much about it and order the three bad mounts, then look at the (two) old mount holes vs the shaft they fit onto (not the rear one with a bolt). mmmmm, the holes are about 20.0 mm while the shafts are 15.4 mm . It's the same hole size on the old mounts as the new mounts. Is this standard? Am I missing some bushings? Almost 5 mm of "play" in engine mounts makes no sense to me (but then I come from a Miata/Ford background, lol).