Ok good- that's what I was thinking. So, what are everyone's thoughts on changing oil and using rislene or miracle oil, vs swapping out the lifters as a next step?
The camshaft pushes on the lifter. (either solid or hydraulic)
The lifter pushes on the pushrod.
The pushrod pushes on the rocker arm.
I would focus on the lifters and pushrods.
Since the mechanics stethescope yielded no surprises, I would surmise the rocker arms are lubing fine.
bent pushrod or failed lifter is my "bet".
The camshaft pushes on the lifter. (either solid or hydraulic)
The lifter pushes on the pushrod.
The pushrod pushes on the rocker arm.
I would focus on the lifters and pushrods.
Since the mechanics stethescope yielded no surprises, I would surmise the rocker arms are lubing fine.
bent pushrod or failed lifter is my "bet".
I've ruled out a bent pushrod- pulled them all and rolled on a pane of glass yesterday. So, I just ordered a new set of 8 risers from iboats
With a little luck, I'll get those in without any major headaches and the noise will be gone this weekend. I'll post back with an update when finished. In the meantime, if anyone has any advice on things to be careful about, or to look out for, or procedure for replacing the risers- I'm all ears
The manual has very little information about the process. Is there any special lube I should put on them since they mate directly with the camshaft? Or is regular engine oil sufficient? Thanks in advance, and thanks for all the help with this so far everyone
Yes- lifters- thank you. My fingers are crossed as well. What's a rod bearing? Does that have to do with the push rods? Is it lodged somewhere in the head where the rods pass through? I can try that spark plug trick before replacing the lifters.
Oooohhhhh- I just watched some videos and I see what you mean by rod knock. Jeez- now I'm really crossing my fingers. I don't think it sounds quite that serious when I run it though- so hopefully it will be the lifters. I guess I'll be posting back either way at some point this weekend
I think I'm OK on that front though. I had a guy who rebuilds engines for a living give a listen to my video, and he felt that the noise was too slow to be a rod bearing- he feels it's in the valvetrain, or elsewhere in the head. He's suggesting I do a leakdown test before jumping to replace the lifters though- so I may be doing that this weekend first. He also suggested I readjust the valvetrain from 3/4 turndown (after zero-lash) to only 1/4 turndown (preload). Anyone have any experience with this?
Flipbro- I remember you saying I should use a half turn of turndown after zero lash as opposed to the 3/4 in the manual- this guy said 3/4 is crazy, and way to tight.
Mike the 3/4 down is fine and in my opinion 1/4 is not enough. 1/2 would also be fine aslong as your sure on the zero lash. This is not your problem. And I dont see how a leak down will tell you if you have a bad lifter
