400 sb binding

towacoman · Newbie Joined: 24 Jul 2012 Posts: 4 235.18 points

I have a 400 short block that was rebuild a while back. When i rotate the engine it will reach a spot and then hang up. I removed the lifters and the fuel pump still hangs up in this one spot. Any ideas? I think I will pull the timing chain cover next to see if there is a bind are obstruction there

clay · Posted: Mon Jul 30, 2012 10:51 am Post subject:

Maybe something dropped down the intake during assembly sitting on top of a piston? Look through the plug holes with a flashlight and you might be able to see something. Is is on the engine stand? You could rotate it on the stand and see if you hear anything "spare" stuff rattle around. Welcome to Smokemup! Clay

towacoman · Newbie Joined: 24 Jul 2012 Posts: 4 235.18 points

Thanks Clay,I have the heads off, I think my next step is to take the timing chain cover off and see if its something with the chain

clay · Posted: Mon Jul 30, 2012 1:33 pm Post subject:

was it a stock rebuild or were better rods installed? factory 400 rods are different to clear the camshaft and not all rods will clear. clay

10sec.et · Posted: Mon Jul 30, 2012 2:10 pm Post subject:

does it have a windage tray ? had a "builder" send me one that he didnt bother to check clearances and it would only make 1/4 turn in either direction.

towacoman · Newbie Joined: 24 Jul 2012 Posts: 4 235.18 points

Clay, stock rods

af2 · Posted: Mon Jul 30, 2012 8:47 pm Post subject:

squeeezer · Posted: Sun Aug 05, 2012 12:21 am Post subject:

Oil pump drive rod?

Knarley Darley · Member Joined: 22 Apr 2004 Posts: 1149 536969.38 points

I had one once hitting the crank counter weight on the small end of the rod where it flares out slightly around the wrist pin. It cleared the under side of the piston, but the pin boss hung down slightly below, and the counter weight hit it at bottom dead center, and you could definitely feel it stick when rotated by hand

10sec.et · Posted: Wed Aug 15, 2012 11:05 pm Post subject:

Knarley, where the hell ya been ???????

zz485ss · Posted: Wed May 08, 2013 1:44 am Post subject:

So what was the out come of this?

10sec.et · Posted: Sat May 11, 2013 1:07 am Post subject:

Paul P · Posted: Sat May 11, 2013 10:22 am Post subject:

Even if it was that shouldn't kill the post?

10sec.et · Posted: Sat May 11, 2013 11:22 am Post subject:

some people are too embarrassed to admit a screwup. embarrassment will kill a thread instantly. however, im just speculating. i really dont know what happened. he probably just didnt like Adam Laughing

.

af2 · Posted: Sat May 11, 2013 7:38 pm Post subject: