|
Farmall Daddy
01-09-2006 15:36:08
|
I have recently rebuilt my 1962 Farmall 560 into a higher horspower farm/pulling motor. I had the motor bored from a 263 out to a 301 cubic inches. All new parts including pistons, rings, pins, keepers, rod/main bearing, cam bearing, new camshaft, and a new oil pump. Had problems throughout the year with the engine not hitting on #5 and #6 the way it should. I pulled the head off and took it to a local head machine shop and come to find out, the previous place I took the head to have it "redone", didn't find that the valve guides and seats were totally shot. To top it off, the second guy I took the head to had to shave .015 off one side, and .002 off the other to make the head parallel and true. After I got the head redone and in operational order, I pulled the pistons out the motor, checked rod bearings and the rings to make sure they were still in good shape, in which they were. I put the pistons back in, although I didn't take #1 piston out because I used that cylinder to check clearances when I went to do the head work. After I assembled the motor, I set the valves at .030 cold, and she fired right up. Purred like a kitten on all six, and when she warmed up, I set the valves at .027 hot. I ran it for around 30 minutes, no problems. I went out the next day, fired her up, and it started to knock. First thought....she was about to throw a rod bearing. Then I thought, I checked the rod bearings, they were in good shape, and I retorqued all of them, including #1 down to specs from the shop manual. I was stumbled by this, and then I though, well...I wonder if it is compression knock from a leaking head gasket. I checked the oil, no water there. Dad came out and took a listen to it, and he said, do the easy stuff first. We adjusted the timing, did nothing. We moved to the valve train, and on #2 cylinder's exhaust valve was a little loose, so I tightened it to .027 hot and it seemed to quite down on the knock, so i though, hmm...lets tighten it down some more, and see what happens. Tightened her down more, the knock was hardly noticable. When I set it back to loose, just testing it by the way, boy did she sound like a diesel 560. I tightened her down till the knock went away and not too much that the motor died out, and took her for a drive. Sounds pretty good even with the timing retarded a little bit since i haven't put her on the dyno yet. My question is, has anybody ever had this problem of knocking like a diesel motor, and it just been a valve problem? I have worked on a lot of motors, and I haven't ever ran into this before. Thanks for any input guys/gals!!
|
|
|
|
