Broken fulcrum, bent pushrod, all hell has broken loose

DEEZUZ · Nov 9, 2015

Ok chicken or the egg type deal here.

First off I have never ever seen this on a 7.3. #7 had an ever so slight misfire and an obnormal crank cadence. I just put UVCH on last month, figured one of them let go already but I found this.

I can get a pry bar on the intake valve and hit it with a hammer and can hear the valve open, but exhaust I can't get a good angle on it.

Truck was driven to me over 100 miles like this so I can't imagine what was happening to all the fuel in the cylinder...

I can't look at the lifters good, I didn't bring me borescope home...

Any ideas?

DEEZUZ · Nov 9, 2015

DEEZUZ · Nov 9, 2015

Swapped the rocker and good pushrod to both sides and both valves move freely.. Pending lifter inspection I'm just going to throw a good pushrod and fulcrum in and see what she does

And no its not a manual so chances are over Rev didn't cause this

Vader's Fury · Nov 9, 2015

I have seen the rockers crack around the ball bearing cup and cause the valve not to open but never seen a mount break like that.

Did the intake or exhaust break?

I would think that it should be fine. The one that was brought to me was run for weeks with it popping out the intake and after changing the 2 rockers it ran fine. Still running now and that is over a year ago.

psduser1 · Nov 9, 2015

Maybe just plain wore out?
Don't hear much of this on a stock, or well setup engine. Usually bent pushrods.

DEEZUZ · Nov 9, 2015

Broken fulcrum on exhaust and bent pushrod on intake. Stock, 100k.

psduser1 · Nov 9, 2015

Sounds like an over-rev. Just guessing, cause 100 isn't much, lol.
New truck owner?

DEEZUZ · Nov 9, 2015

Who knows whose driving it at any day. Plow and work horse.

psduser1 · Nov 9, 2015

Gotcha.

Bustedknuckles · Nov 9, 2015

Ether?

DEEZUZ · Nov 9, 2015

Nope. Starts great bone cold and hot. Was running down highway when this happened

Arisley · Nov 10, 2015

Sometimes it just happens. Maybe a rocker was loose and you didn't notice it when you changed the UVCH (not looking for issues). Swap everything out and see what it does.