I've been helping a friend to freshen up his 1921 engine and we are on a budget. After checking the rod and main bearings we found that they all can be tightened up with the shims, but #3 rod bearing has a crack in the rod end of the bearing. The cap is OK. The crack doesn't look new, but I'm a little concerned about this one.
Looks like the babbit is pulling away from the rod. I'm thinking that it would be best to either re-babbit this rod or to replace it. Mike
Yes, re-babbitt or replace it. Do it now while the engine is open.
Just my opinion.....
It doesn't appear there is much of a tinning on the rod for the babbitt to adhere to. Makes me wonder what the other rods are like.
Replace it is my opinion. You can find nice used rods at swap meets if you look for them.
I found a never used rebabbitted set at Chickasha for 40.00.
They came from an old dealership.
I passed up some good used ones that were 5.00 each.
Thin or cracked babbitt best be avoided.
Replace it. If the babbit breaks, you might find that the entire engine will need rebuilding. I have a friend whose babbit on #4 broke up and ruined the magneto coils. It could also ruin the crankshaft or cause other worse problems. It might run a while as it is, but when it goes, it will be at an unexpected time and place.