I'm in the middle of building up my motor. I have completed tighting the thrust caps and removing the paper clips out of the timing chain tenisioners. I rotated the crank a few times and notice that both the right and left timing chains will slacken (not both at the same time) and then tighten as the crank is being rotated. Is this normal?? Of course I'm only rotating the crank clockwise and never counter-clockwise.
This is normal. This happens because of the valve springs pushing the cams around. The ratchet mechanism in the tensioners keeps most of the slack out of the chains at startup. Once the tensioners get oil pressure, any remaining slack is taken up.
