Ka24de valve knockin please help me

[alex7542]

Hey guys

I jsut finsih replacing my head on my car. And i started the car and it sounded fine with no problems. then i shut it off . and the next day i turned it on and reved the engine i let it get hot. Also i did rev the engine up the first day i started it and it sounded perfect. We did have a problem that while it was idling. IT would idle at 1000 and the it would start going down and shaking like crazy and bogged off. IT wouldnt stay on unless i gave a little throttle. I am not to sure what is wrong with the idle but ill figure that out.

BUt then the second day i turned it on. It turned on fine and at idle made no noise. but then we reved it up. and you hear a nocking noise. a loud as* nock. like if it was a blown rod.Its not a blown rod bye the way. I made sure the block was fine. And we turned the engine off. Turned it back on, and the noise was there again when we reved it up. and everytime we reved it it got louder and louder. i finallly decided to turn it off. and when i tried to turn it on again it didnt turn on. it seemed like if the timing came off.Well if you guys can help me with that it would be great. I have searched around and cant find anythign exactly with my problem.ThanksAlex

P.S. it sounds like if the valves are sounding real bad.but i dont know why. i relaced all my valves and springs and stuff. and its making the noise and now it doesnt turn on.

Please help me out as soon as possible thanks

I did search by the way and i found one thread which i posted the same thing and have gotten no response so i decided to post again.

[TrunkMonkey]

did you triple check to make sure everything was lined up correctly when you put it back together?

-demetrius

[deviousKA]

You will find out what you did wrong when you take it back apart.

check timing chain first, inspect the valvetrain, then pull the head to check your valves if need be.

you have the proper shims with correct valve lash?

im sure you will find the problem with one of those. If not you may have a bad bearing in your rotating assembly, doubtful

[C-Kwik]

Did you lap each of the valves into the head? If you put brand new valves on(especially on an old head), it may not be seating squarely. Also confirm the valve lash like Devious mentioned.

It seems odd that it would start knocking a day after though. A spun rod bearing can sound an awful lot like a valve that is off...

[Nathan]

Did you snap a camshaft? Pull the valvecover and see what's going on under there.

[alex7542]

Yea i did triple check everything to make sure everything was lined up with no problem. And the valves were seatin in perfect as it was sent a machine shop to be fit right. I havent been able to take the valvecover off till lik january the 6th the warehouse were the car is parked i cant go in till then. But im just trying to see what possibilites could be.

All the shims were in the correct order and everything. I spoke to a mechanic yesturday and he said maybe the timing chain tensioner is bad and the timing chain would be knockin real bad and then either it broke or came of the sprokets causing the timing to go bad.

What are the possibilities of brakin a cam shaft in half. arnt cams preety strong.

[C-Kwik]

They are strong, and the chances are low. And if a cam did break, It's doubtfule the car would run.

[alex7542]

Yea the car stop runnin. after the second day. the timing seemed to come off. what im goign to do is turn the crank manually and see if the pistons get to contact the vavles at all. Obviously ill do this after i check the upper timing chain. and if its ok hopefully i dont have any bent valves thats what happened to my old head. and i dont have the money to send the head to a machine shop again. But hopefully i can figure that i dont have to take the head off again. if nto that leads to new headgasket and stuff. And im out of a job and car so im screwed.please if u can think of anyhting else guys ill appreciate it alot.also around how much is the upper timing chain?thanksalex

[Nathan]

The chances are pretty low, I only mentioned it because I've amazingly, heard of it happening before. Also, it causes symptoms very much like yours and usually knocks around like crazy. Hopefully it's just timing chain related and can be easily fixed. You really wont be able to figure out much more until you get in there and look though

[D Money]

check rod bearings

[alex7542]

Hey Crazy Its not the rod bearings. We checked them before we put the head on. Plus the noise is comming from the top of the motor right under the vavle cover.

[C-Kwik]

but you said the knock came after the second day. A lot can happen in one day. Perhaps oil wasn't reaching a bearing and as it wore out, the tolerance got higher, or it suddenly spun a bearing at some point and now it knocks. Check all possibilities.

[alex7542]

Well guys i finally got to take the vavle cover off and see what happened.

And i figured it out.you guys know where the timing chain sprockects go screwed into the cam shaft. well right there on the cam shaft there is a lil piece of metal comming out of the cam shaft that round and the screw goes inside of it. Its like a guide for the sporcket.

WEll they were warn out and the exhaust came one was broken. cause the cam not to move while the sprocket would move. The intake came did not completly break but it had a lot of wear on it.

So know i have to change the cams which suxs hopefully i can find some. And i also pray that i did not get to the point of bending any vavles.

Anyone have ka24de cams for sell the cams from a s13 chassis.

But just as a precaution i will be removing the head again and see if i bent valves.Thanks guysAlex