|
You sure its a wrist pin knocking and not a worn out thrust bearing? My 53 MM RTI knocked when I first got it. Sometimes the knock would go away. It would just bang to beat the band. There was no rhyme or reason. I could start it up and it would not knock the entire time I ran it. Other times, it would be knocking right off the bat. I decided that I better take it apart and check the rods, etc. I put in new piston rings and rod bearings did the valves, etc. when I restored it. I did not do the mains at that time because I could not find a set. The RTI uses a Rollar bearing in the front and normal main bearing in the rear with the thrust surfaces on it. When I started the tractor back up after doing the rods, etc. It knocked.. I then pulled it back apart and split the thing. It turned out that the rear main bearing was worn at the thrust surfaces and this was allowing the crank to move fore and aft slightly causeing my "knock". Once I replaced both main bearings. The knock went away. My 1949 ZAU does the same thing once in awhile. I have had it all apart as well, except for doing the mains.. Just have not had the time. With haveing to split the tractor. Besides that the knock is not real pronounced. It needs to be done however. I do not want to ruin the crank. I am sure I will find that its the same kind of deal with it as well.. worn thrust bearing. Just another thought.... Phil
| 
