Hey ladies and gents. Here's the jist. I have a 72 AMC 304 that I just had honed, had the crank turned to .020 and installing new main and rod bearings. I got the .020 bearings and installed them with a ton of assembly lube. The problem is when I torque the 1,2,3,4 rod end caps and try to turn the crank to torque 5,6,7,8 it won't budge. If I loosen 3 of 4 caps it turns easily. I'm positive the pistons are in the right cylinders and facing the right way. Is this normal or should I be worried about something else? Thanks
Need to get some plastigauge and check your clearances just because the bearing says one thing does not mean it is so it is best to check before assembly. I bet one of the bearings is binding down and that in turn locks the crank down it happens. When I do engines I always check the clearances not knocking the machine shop but we are human.
They say money can't buy happiness but it can buy Jeep parts...and Jeep parts make me really Happy.
I didn't measure end gaps because I'm reinstalling the same crank and rods. I'll get some plasti-gage and measure them. Is it possible the crank is just a bit bigger than the rod guides and it just needs to be worn in?
Not likely. If it's binding at all, there is a problem, and it will likely cause fire-up problems, or worse. I learned that lesson the hard way....
My heads had residual glass bead dust in them, that wasn't cleaned out properly before reassembly. This caused to much friction between the pistons and the cylinder walls. Although my crank assembly would turn manually, it took a considerable amount of force to do it. My first fire-up attempt, at the dyno shop, was a complete bust due to this condition. The engine wouldn't spin fast enough to fire. It cost me another $800 to have the dyno shop diagnose and correct the problem.
The only reason i didn't check end play out rod end gap is cause that's the word i got from the machinist who honed the block and turned the crank. It's my first rebuild and everything else has been done according to specs. Ring gap, timing, timing chain play allowance etc. i just started with the pistons last night so plasti-gauging the rod ends can still be done. What if the gaps are too small?
Please tell me you are using a manual, of some sort, to do this overhaul.
Yeah. I'm using a Chilton manual. I'm mechanically inclined but mostly on helicopters.. I do all our auto maintenance, I've just never been this deep. Its fun so far, i just wanna do it right. Thank u all so far.