Loud Knocking after replacing broken head bolt...Update

[Pabz]

Hi all,

About 3 weeks ago I had coolant spewing into my oil, thought it was a head gasket but it turned out to be a broken head bold. Got the heads refinished with a valve job.

Got it all back together and running but i am hearing constant knocking.
Check out this video, you can hear the sound clearly.

VIDEO

I took the front valve cover off and noticed a valve wasnt even opening. could this sound be comming from the lifters, rods, and rockerarms not building up sufficient pressure because the lifters got clogged with all that coolant. I will be taking off the intake manifold and cleaning the lifters out.

I just want to know if i will be waisting my time and if something worse happened that caused that head bolt to break. Requiring me to remove the engine.

Thanks for any help on this one!

[SappySE107]

RE: Loud Knocking after replacing broken head bolt

If a valve isn't opening, you either have a worn down cam lobe or a collapsed lifter. You will need to remove the lower intake and inspect it but its either those 2 or a broken pushrod.

[bszopi]

RE: Loud Knocking after replacing broken head bolt

It could also be a broken valve guide, allowing the pushrod to slide out of the rocker. Kind of sounds similar to mine when I broke a valve guide.

[Pabz]

Two broken lifters



The arrow is pointing to the bad one, it was alot more pushed in, but you can see how loose it is.



So what now??? Can i put new/used lifters in without changing the cam? I know this is not recommended, however i do not want to take the engine out and i only need it running for the winter. Will i kill the cam if i throw new lifters in there??? guides look good no grooves. When i took the lifter apart there was alot of dark oil that was thick inside, i think this is what did it.

[Juglenaut]

Looks like they went dry after you removed the heads. Always make sure they are prime after removal and reinstall.

New lifter and push-rod is all.

[Pabz]

Oh i primed the engine driving the oil pump with a drill, i think it was the coolant and crap that was in there.

Replaced the lifters, and now no noise, idles ok but no throttle response.

[Juglenaut]

That might prime the lifters, but the only sure way is to soak them in motor oil upon removal with the little hole facing up.