Tapping in the engine!!!
 

well i just did a rebuild on my stock ls bottom end, new main and rod bearings new, oil pump, water pump, etc....

well i started my car up and drove it for 100 miles and it started to make a tapping sound like it was a rod nock sound but it didnt come from the bottom end, it mostly sounds like its coming from the head, i checked the oil for metal shavings didnt find any so idk what else to do, i just took out my cams but didnt find anything interesting of where the sound would come from

Vtec head? Possible valve adjustment.

timeing right? could be knocking valves into the pistons lol

maybe dirty lifters????

no vtec head stock ls head with new valve train, about 7k miles on it, i did the valve adjustment but still knocking sound

i thought i had the timming right maybe i was off idk could there be something else

how can u tell if it is rod knock? or not

loud knock from the block it might be a stuck lifters like i said before try putting some seafoam in the head it should clean it all off.

ok ill try that gotta put the cams back on and redo the timming so lets see if that helps

did you check the specs on the bearings?if it was not making it when you first started then sounds like there was to much gap and is now starting to wear down,why did the bottom need rebuilding?was the crank checked?is it a tapping or more like a light thuddish rattle sound

bottom end needed to be reworked bc i had a rod nock, and no i didnt get my crank check but we did a gap test with plastique gauge or something like that, its more of a loud tapping sound coming from where the intake manifold is... idk exactly how to explain it

if you used the same crank after it already had a rod knock thats your problem.your going to have to rebuild it with another crank it will only get worse im on this if you reused the crank..jack the car up and start it get under there you will hear it nice and loud under the car.

^^ x10

im pretty sure its coming from the valve train. the crank was reused, and he didnt have it checked by the machine shop, though i would have liked him to, but he did plastigauge it and they all checked out. i've listened to it breifly, using a stethescope and from what i could tell its coming from the top end.

Post video of the sound then we can evaluate from there. The crank should have been checked with a micrometer on the journal that had a spun bearing previously. Just because the bearing was plastiguaged doesnt mean that journal is straight all the way around.

ehhh if you had rod knock befor and reused that crank ruff surface not good

ok, funny thing is that im experiencing this in my 420a eclipse, at first i was scared out my ass that is was a rod know or spun bearing, but i have driven the car within time and time and it still hasnt blown or spunn, and i actually floored it acouple of time in second gear and first gear and it doesnt wana blow or anything lol, but it does sputter.

it sound like a knocking/tapping sound. now this is where it get intresting, i have brand new lifters in the car beause previous ones where starting to click. so i put in these new ones, but i didnt know and after i installed them, they told me i had to take them to a shop and bleed them, so they told me to leave it alone and they will bleen them selves, noise will enventually go away, but seems like it just gets louder and louder, (its quite embarrising to drive, people just laugh) so yea, i dont beat on it, just like i floored it twice like i mentiones, but i feel like its performance has worn out, like it bogs and sputters time and time and spark plugs are new and wires and coil are in good shape. for some reason im thinking its valve adjusment, but idk how to do that. any tips on checking and fixing valve adjustment?

i dont have super sonic hearing but i hear the lifters, but within that sound like there is an extra knock/tap and it sounds like its runing on the cylinders (sorta like a lawn mower lol) but it could be my imagination.

aftermarkt cams and valvetrain? they are always noisy.

it can be ur LMA

the crank may look good and when you put the plasti on it then yes it looked good BUT, it is alot tighter or looser on the sides. I'v never seen a spun rod bearing and the crank or rod be ok

jus wana say sorry to OP for thread jacking, but maybe we can knock out 2 problems in one thread lol.

so yea, thats my problem

im gonna take off the head to check for damage i dont think its a rodnock, bc it was the main bearings that were worn out not the rod bearings they were brand new and didnt see any damage on the rod bearings, mostly seen them on the main bearings but it wasnt that bad, but i did go under the car and the noise was coming from the top of the motor dont think its a rodnock, its gonna be something in the valve train

lets see if i find the problem

100 bux its ur lma

can you gona get a rod knock in an n/a motor without using boost or nitrous?

and LMA would be what?

sorry not good with fourmus abreviations =/

I have no clue

its not your lostmotions if the info you gave is true in the first post its your rod bearing i will take that 100$ beat on the lma if you stand behind the car can u still hear it loud?

bro my la are tapping i think i know the description lol, wouldnt ur knock sensor send the code to the ecu ?

no on the sensor i wish the knock sensor did more its like the appendix its just there.the lostmotions would have been makein the noise the whole time he said after time it started where u located?

This SAME thing is happening in my EX. I had the motor rebuilt a few weeks back, and for the first 600-700 miles all was fine. Then one afternoon I started backing up and I could hear that thudding/knocking noise. ALMOST sounds like its in the valve case, and I can hear it mostly at about 2300 RPM's. It's a dull thudding like if you knocked on the valve cover really fast with your nuckle. Sound the same as yours?? From the center just above the headers. We checked the oil pan for shavings too... nothing. Checked everything we could think of. I have no codes either.... I had 3 bad motor mounts, and after replacing the upper driver's side the noise has subsided, but it's still there a little - I still have to replace the driver's side lower and I'm hoping that takes care of it. It could be a combination of things...but so far I haven't had any major trouble...please keep us updated as to what you find! :D

so basically if its a rod knock or if if the bearing is gona spin i should check my oil pan for shavings?

Definitely. If you've got a spun bearing you'll know.... it gets louder and louder and you'll have metal shavings in the oil. Make sure you check all through the bucket or whatever you use to drain the oil in to. The metal is going to settle in the bottom if there is any in there.

i jus change the oil the other day and have the bucket next to me, ill check it in a bit.

now how can i check if its a rod knock?

im locATED in Clearwater, by countryside mall im gonna do my oil change too and see if there is any shavings plus im gonna take the head out tomorrow

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Morty

bump, any info?

we did the valve adjustment and re did the timming and its still tapping, it sounds like the valve is bend for over reving

when you drive there car, does it bogg or sputter a tad bit sometimes?

when its a normal operating tempeture, and you stop at a light, does your oil light pop on, and when it idles between 800-900 when it hits the 80 do you here a little click clack within the the tapping noise?