got rid of the chain slap, replaced the ,trickflow, chain tensioners <- junk. now it sounds like a lash adjuster or two is not priming up after 10 minutes at idle

video-2012-10-30-19-11-50.mp4 video by Fast150 - Photobucket

im going to test oil pressure at the head tomorrow..

this is idling at 900rpm

 

lifter failed and it's wiping out the cam lobe or lobes

pull it before it trashes the rest of the engine with shavings



have you tried taking off the belts and running it?

 

 

uha hoo . . . it's a DOHC motor !

can you run it with the valve cover off?

 

yeah doing that saturday or sunday, to see which tappet/lash adjuster is flat

 

Is the picture with the valve cover off before or after the video.

My buddy had a 2v mustang, and a couple rocker arms fell off and sounded similar.

 

before the video, posted a picture to show TooTall how the tappet/lifters/lash adjuster are oriented on the modular motors

 

What engine is this?4.6?5.4? my 04 3v F150 made that sound 10x louder it ended being the timing chain tensioner plastic guides or whatever you call them

 

guides are new, i just replaced both tensioners which got rid of my chain slap, now i can hear other noises from the valve train. one of those i build a brand new motor with top of the line parts and everything from trickflow has failed me thus far....

 

got it fixed, turns out my builder forgot to install two small 1/8th in plugs in both front and back of the passenger side head. i got the rear one installed a while back after the first start up it leaked a lot of oil. but as it turns out the drivers head had 65psi of oil pressure at idle and the passenger side had 0. i pulled my old heads off of the stock motor and found where the missing plug went. it was a pain to get in buy dad and i got it in. we had to cut down a 3/16in allen wrench down to the curve to get it in and tight. but it was a lot easier than pulling the head and all of the studs.