the noise is not constant, everyone tells me its not a rod knock sounds like its coming bewtween head and block to me under the vavle cover...i check everything i can with out taking motor apart , the timing is right no bogs nothing is loose , new clutch and tune up , i just swaped this motor first start up its been doing it ..idk wat else i can do before i take motor apart

 

its more likely not a rod knock if its not knocking constantly...when i had my rod knock it did it constantly... i would just check your spark plugs and everything like that... also when your rod knocks, you can not tell where its coming from because its loud....try posting a video of it..

 

Is it an obvious knock sound or is it more of a tick sound?

 

Almost 100% sure you just need a valve lash adjustment. If it's coming from right under the VC then that's most likely it. A valve adjustment should be part of your major tune-up procedures.

 

idk its not like a tap like a loud idk like something is loose or not tight all the way, when u rev it up is when u hear it clear after 1500 or soo but its not too loud at idle u can bearley hear it , ill try to post a video

 

Yeah I agree it's probably loose valves. Do a valve adjustment and it should get better

 

well its constant when u leave it at certain rpm , tomarrow ima see if it needs to be adjusted

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by preludeboybmw &raquo;</TD></TR><TR><TD CLASS="quote">well its constant when u leave it at certain rpm , tomarrow ima see if it needs to be adjusted</TD></TR></TABLE>

How are you going to do that? You have feeler gauges and a Helms manual?

 

its most likely rod knock, if you cant hear it at idle.. but hear it while driving..

does the sound change when the throttle % is changed? ie no noise at 0% throttle input.. then you can hear the sound around 30-50% throttle

also does it sound like as if you have a exhaust leak? but only sometimes.??

if so.. its most likely rod knock.. rod knock also means ur bearing is gone..

which means you`ll need to rebuild.. and get a new crank..

do not regrind a stock crank.. the surface are heat treated to make it hardned..

 

yeah i got the manual lol , and tomarrow ima have my buddy bring over the feeler guage

 

well no one knows wtf it is , he said maybe oil pump he dont know nither , heres some videos i found this wat it almost sounds like

http://youtube.com/watch?v=lNM...lated

http://youtube.com/watch?v=2P7...lated

 

thats sounds like rod knock to me man

 

sounds like piston slap or rod knock.

and why are you posting nissan related stuff in the prelude forum?

 

Yeah, those videos sound worse than valves ticking for sure...

 

im showqing you guy wat noise it makes in the videos...

 

lol wow... if your car makes the sound like that nissan does than thats a big prob....

 

I can't open the video to hear it now, but what you are describing may be the LMA's making noise. If its up top on the motor, could be it.

 

If it sounds like its coming from inside the valve cover.....its valve lash.And just so u know u can feel a rod knock in the gas pedal,and its constant,not periodicly.

 

not sure if it applies for you but my h22a1 used to make a knocking sound like that only around 2500rpms. it turned out to be my timing belt tensioner.

 

I think I know what noise you are talking about. My H22 makes a similar noise when it is cold and at low rpm. I am due for a valve adustment and I will see if that clears up my problem.

 

Hey did your H22 make that noise only when the car was hot? And/or only when driving under a very light load?

 

are you in a 5th gen? if yes check your timing belt tensioner. mine made a slappy-knocky noise when it failed at 30k. was worse around 1200rpm then faded away with an increase of rpm you could hear it at idle though.

be careful of the auto tensioner. it can cause a lot of damage if it fails.

 

Its actually a 6th gen...

I dunno.. doesnt quite sound like the noise you described i guess..

 

I am confused by 6th gen... but if you have an h22a4 from usdm 97-01 I would really suggest inspecting your tensioner if it is an auto (hydraulic) type. the way you describe it to me sounds similar enough to make me suspicious. the auto tensioner is a common failure.

 

Hey, actually - if you don't mind... Could you check out this post that was made on Driveaccord.net or whatever.

http://www.driveaccord.net/forums/sh...ad.php?t=15602

My noise sounds EXACTLY like the poster's noise with the exact same symptoms and everything... I also made a post there...

If you got the time, check it out and let me know your thoughts - (if you dont mind!)

The guy who made the post doesnt seem to use the website at all anymore, but at the time, he didnt know exactly what the noise was.

(just to add... Its been makin the noise since I got it like 20K miles ago... and hasnt really gotten any worse...) but it really does sound bad and only does it when hot and under light load...