1998 chev silverado hydraulic valve tightening...?

Question

Ok, maybe I'm just stupid like other people have said, but i have followed HAYNEs word for word here. The truck has a 5.7 vortec v8, and It sounded like the rocker arms/pushrods were knocking around a bit too much. So I followed the instructions--tigthening the appropriate (closed) valves at tdc and 360 degrees out. When I tightened hydrualic valves before It was always to torque, and sometimes finishing with an angle meter.

Here the instructions say (in short) to "tighten until all play is removed, then turn each nut an additional 270 degrees to center the lifters." I did this, and now the engine sounds really really bad (I triple checked the spark plug connections and other electrical, all is ok). All I did is tighten the rocker arms as specified, now people are telling me I just turned my rocker arms into spaghetti. What did I do wrong, or could something else be the problem (engine was running ok this morning before tightening). I'm a backyard mechanic who is learning from books, so call me ignorant-- just don"t call me stupid.

Answer 1

Join www.fullsizechevy.com and ask your question there. Largest FSC forum on the web. Tell them PHATSPEED7x sent ya.

Answer 2

No one here should do anything more than try to help you with this problem.The one thing that pops up is did you tag the push rods when you removed them? This alone could be your problem.It is critical these push rods go back in the same place.Ive always on the 350 torqued the rocker arms at 22 ft pounds cold and never had a problem.Please look at this link maybe it will give you some incite to help you work this problem out.Best of luck.  http://www.autozone.com/shopping/repairG...

Answer 3

had similar problem with a 4.3 v6 hydraulic rollers  if the nut on the rocker has       [ locking]  dimples on top of nut . supposed to replace nut and stud to be able to get the right torque  i just used a punch  once i got the valves adjusted on the stud and nut to keep from backing off . this might help or not? it worked for me  one rocker still rattles a Little bit only when motor is cold but when motor is at running temp the push rod expands  and no rattle.