88PatrolCar

So Im driving my car minding my own buisness and all of a suden my engine starts knocking bad. This is a hard knock too. You can hear it coming from what sounds to be like the #5 cylinder and it is ecoing out from the intake manifold. The thing about it is I havent even gotten on it since the rebuild. Do you think that this may be a broken valve spring? Or something more severe?

import slayer

Does it do it when your on the gas or let off the gas or both?
Pull the valve cover(s) and take a look. A broken valve spring will be obvious. You would also notice a loss of power.

88PatrolCar

It does it all of the time, It will barly idle, Im almost afraid to start the stupid thing. Fortunatly when it started doing this I wasnt more than a half mile from my work wich is an auto shop so I kept it under 2000 and putted my way down a busy street.

import slayer

Yeah, i would say start with removing the valve covers and take a peek.

pena8759

I agree with importslayer. But IMO it sounds a little more severe than a broken vavle spring.

import slayer

Since it does it all the time and not just during decceleration, that rules out a connecting rod bearing.
If it is a valve spring, I would say it's an intake valve spring because and exhaust spring would cause backfiring.

88PatrolCar

Thanks for the help. I guess Ill do a compression check on it and find out what cylinder it is and then ill tear into it.

import slayer

You seem reluctant to take those valve covers off....why? I'm telling ya, if you take those valve covers off, you'll know immediatly if you have a broken valve spring or not.

88PatrolCar

Its not that I was being reluctant, it was the fear of what I might find when I do take the covers off. Anyway I took the drivers side valve cover and much to my suprise the the rocker arm on the exhaust valve of the #5 cylinder is broken off and just laying next to the valve (theirs my knocking noise), then I pull the pushrod out and see that it has been bent. So now I begine drilling the broken off rocker bolt so I can get an easy-out in their. I sucesfuly removed the broken bolt, and then I put a new pushrod in, put the rocker arm on with a new bolt and did a compression check. WTF now the cylinder has no compresion and before I took it apart it had 150psi. Now im stumped

vfast

you may have wore the lube of the cam.....my advise is put the plug in it and start it to listen is you here a poping sould this will indicate a hole in the piston.......while rolling it over make sure you sell the rocker moving up and down on the valve