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stealthfti | all galleries >> Galleries >> the B230FT short block > view of a properly resized rod
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view of a properly resized rod

When con rods are resized properly, the locating dowel sleeves [visible on the rod] have to be removed in order for the machinist to mill a couple of thou off the bottom of the mating surface. A couple of thou of steel is also removed from the cap mating surface. The dowels are reinstalled; the bolts installed and torqued; and the journal is honed to correct diameter. By removing material from both halves of the rod, the halves remain halves, and the same amount of metal is honed from the rod body AND from the cap.

this procedure is sometimes short-cutted: the machinist mills more than a couple of thou from the mating surface of the cap piece only before honing to size. This saves time and cost of new dowels; but results in the halves not being equal halves around the rod bearing shells. Some are unconcerned with this shortcut approach; my machine shop does the job correctly. The dimensions are restored to spec; and the rod will hold it's bearing in place.

the rod bolts on the B230s are 'torque/angle tighten type' [TAT] bolts. There is a max length spec: if the bolt length is longer than 2.187in from the bottom of the shoulder to the end of the threads, the bolt must be replaced. For a high performance use, it is smart to replace the rod bolts as SOP. For a DD, the bolts can be reused if they are within length specs. These rod bolts all measured out to just under 2.165in; and since this is for a DD, I reused the rod bolts. If they had measured closer to the limit; or if any were longer than the others, the longer bolt(s) would have been replaced; or a whole new set would have been purchased.

Panasonic PV-SD4090
1/79s f/3.9 at 11.1mm with Flash full exif

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