What is this Noise?!??! Video Clip included

[TrueSlide]

Awhile back my timing chain wore a hole in front cover. Caused oil/antifreeze to leak and mix. Had the front on ramps. After I got the motor running, runs great! But it has been making this odd noise. I cannot figure out if it is a lifter or exhaust gaskets are bad.

Anyone got a clue?

http://media.putfile.com/KA-Noise

[DjPantsSpecR]

oh man, ive never heard that before... maybe you accidently converted your 240 into a diesel truck

i couldnt really see anything in the video, but if you have an E, you need to be worried about that timing chain wearing a through a particular water jacket. this has nothig to do with your noise, but is associated with excessive timing chain noise. you'll be looking for a blow headgasket or a warped head that doesnt exist

[TrueSlide]

Yes, the timing chain already wore through that jacket. After fixing that this is where that noise started to come in.

[TrueSlide]

Another video so stuff can be seen.

http://media.putfile.com/KANoise2

Cant isolate this noise, aAhhh!

[DjPantsSpecR]

have you tried using a tube or fuel hose and listening stethoscope style? that has helped me several times....

however, your noise sonds ridiculous, and loud. like something is definately coming in contact with something else. Now i dont have an E, but i know they have hydraulic rocker arms. like i said i dont know anythign about these motors, but have you checked for excessive clearance between the rocker arm and its contacting surface?

[TrueSlide]

Have not done that yet.

Could gunk got wedged in there and stuck cause the lifter to mess up.

I will do that tomarrow. As far as performance wise its not affected or doesnt seem affected at all.

If there is excessive clearence how can I fix that? Just replace the lifter?

Thanks for your help!

[Chezedik]

I assume you replaced the front cover AND the timing set? Those motors are notorious for tensioner failures. In fact, I had a friend who ruined his 90 that way.

[Chezedik]

Also, I would pop off the VC and check valve lash, shouldn't take a second, and you will be able to write it off if I am wrong.

[TrueSlide]

All that stuff checked. Even swapped out lifters with some other lifters I had from another head. Still making that noise?!??!

[TrueSlide]

Maybe it could be exhaust gaskets?!?!? Going to unbolt the header to check. Who knows??!

[240TweakerNewbee]

Sounded just like my SOHC KA before I did the swap, I was told it was the cam chain... the guide is plastic and can easily become worn or broken, there was a guy that did a tutorial on how to change it, but I lost that link. Hope this helps.

[TrueSlide]

I replaced those when I got the front cover fixed.

[TrueSlide]

I replaced does when I got the front cover fixed.

[Chezedik]

Check compression, then get a mechanics stethoscope? Listen and find out exactly where it is coming from. Maybe wrist pin knock or piston slap?

[DjPantsSpecR]

argh, it almost sounds a little like a spun bearing, especially if oil adn water mixed somewhere.

but my question is how is the power? if it was a spun bearing power would suck hardcore, but it does sound a bit like what you have

[Chezedik]

Good call.

[TrueSlide]

Power is great. I have been to a full track day like that and beat on it for hours. A PCA event and recently a autoX event.

I will pull oilpan and check bearings.

Rod bearings seem replaceable with ease. What about main bearings. Dont see how I could get those in without pulling crank? Possible?

What about my cam, could that be advanced or retarted alot and cause that?

[Chezedik]

Is the SOHC equipped with the crank girdle? If not and it just has main caps, it should be easy to hit the mains. And I bet that if you left the pistons in and left the crank hung on them, you may be able to change crank bearings without pulling it. But that is speculation. And when I speculate, it never works.

[DjPantsSpecR]

chances are its the number 3 rod bearing if it is anything at all.... i think alot of us KA guys have spun number 3



youre looking at the bearing that should be in the cap, not on the rod. only its welded to that part of the rod journal, and the side edges from both of the bearings have stacked up and welded themselves into the "sheet" you see ozzing off the side

[TrueSlide]

Will check that in the weekend.

[Reno]

Awhile back my timing chain wore a hole in front cover. Caused oil/antifreeze to leak and mix. Had the front on ramps. After I got the motor running, runs great! But it has been making this odd noise. I cannot figure out if it is a lifter or exhaust gaskets are bad.

Anyone got a clue?

http://media.putfile.com/KA-Noise

t its a time bomb?

[doriJDM180SX]

argh, it almost sounds a little like a spun bearing, especially if oil adn water mixed somewhere.

but my question is how is the power? if it was a spun bearing power would suck hardcore, but it does sound a bit like what you have

im with this guy cuz my old DOHC sounds like it and louder

[TrueSlide]

Havents pulled the oil pan yet and checked the bearings. I was checking the exhaust gaskets today and had unplugged the 4th cylinder spark plug. Well this is where things changed. I started it up forgetting the 4th cylinder was unplugged and well, the motor was quite! It idled good I didnt even think that the 4th was unplugged till I went to rev and it hesitated, plugged the 4th cylinder back and clack clack clack again and loud.?!??!?!?

[Sonikfuri]

What year is ur car again? The 89 240sx I'm buying makes that noise too, I just don't know what it is. the owner put 15/40 oil in it to see if it'll stop, but it didn't (lol....i think) maybe I should see if I can try that.

[NateDogg]

Havents pulled the oil pan yet and checked the bearings. I was checking the exhaust gaskets today and had unplugged the 4th cylinder spark plug. Well this is where things changed. I started it up forgetting the 4th cylinder was unplugged and well, the motor was quite! It idled good I didnt even think that the 4th was unplugged till I went to rev and it hesitated, plugged the 4th cylinder back and clack clack clack again and loud.?!??!?!?

Well by unplugging the 4th cylinder lead you arent stopping the mechanicals from rotating so it must be related to spark. Probably a dirty/cracked lead or oil in the galley which is leaking spark to ground.