MTFCA Forum

Hard to tell from the limited pix. What do those 3 extra pieces look like?

Best guess - To true up rod journals. Make em round again.

John is correct - crank pin turner.

This reminds me of a tool that was used on my Dad's 1949 Jeep Station about 1958 or so. It had the normal 6 cylinder flat head engine that had a rod bearing knocking a little.

A "mechanic" came out to fix it. He jacked up the right rear wheel and put a "driving device" of some sort under the wheel. He then put Jeep in high gear - manual transmission. He dropped the pan. He then used a tool much like a pipe cutter except it had a grind stone instead of a cutter and had a small electric motor instead of a tee handle. He put this on the loose rod journal and turned it on. The engine rotated and the tool went up and down grinding the journal round again as the crank turned. He then polished it with crocus cloth wrapped around the journal with a leather thong and oil. An undersized bearing went next and then the pan went on and everything was fixed.

I always though that was really kool. I still do.

I have one similar, however, mine appears much older (likely 1920s). I have used it a few time to clean up minor damage to crankshafts. I then use emery tape starting with fine then moving to finer to polish the journals.

It is difficult, but mine can also be used to clean up a damaged crankshaft in the car. I generally always work on crankshafts out of the engine so I can carefully inspect the work and accomplish the task more easily. However, right after I got the thing (original complete kit in its original metal box) at a garage sale of all places, I tried it on a crankshaft in a block to see if it could be done that way.

One does need to be very careful to not cut or score the crankshaft in such a way as to cause a future fracture point.