I'm new to asking questions here. My question is I have a 19 model that had an engine knock, when I pulled the rods and pistons out they were cast iron pistons and heavy rods. I am going to order new pistons and rods , the rod journals are 1.237 - 1.241 diameter. will this give me to much side clearance on the sides ?
Chris, new rods on journals which vary as much as your measurements show is not a good mix. Your crankshaft needs grinding and rods selected to suit, or vice versa.
Hope this helps.
Allan from down under.
If the journals are round and not tapered then you can fit the rods. For instance if one journal is 1.237 and the next one is 1.241 then you are in luck. However if one journal is 1.237 one end and 1.241 the other or 90 degrees out then you need to do as Allan suggested and grind the crank, or buy a new crank.
If you are in luck and can fit the rods, the best way in my opinion is to use the yellow Time Saver lapping paste, available from the parts houses.
What does your cylinder bores measure. Philip
With skill and patience it might be possible to file the rod journals round, then polish with emery cloth. A rod journal tapered or out of round by 0.004 will not hold its adjustment.
I have polished one journal on a 1923 Buick using emery cloth that had a small amount of surface damage but still round and not tapered. For out of round or tapered journals, I would recommend a re grind over filing.