Lifter tick maybe valve tap?

[kpc_0721]

So my intake mani gasket was leaking so replaced it and shortly after that I tick started and I thought maybe it was a lifter tick or maybe I might have dropped a peice of the gasket into the head and bent a valve possibly....dont think it is a bent valve or any problem with the valve because I can only hear the noise at idle and car dosent smoke or anything like that. I flooded the car a bunch of times and got gas in my oil so I think I may have thinned the oil and got a lifter tick? I changed the oil yesterday and it was black after only about 400 miles.

Heres a video of what my car sounds like at idle but sounds fine when it is revved up http://www.youtube.com/watch?v=84-FoHXFUVw and I can feel a tapping on the valve cover when I put my hand on it.....Anyone give me insight on what this might be beacuse I refuse to drive the car even down the street because I dont want to be driving it and have it turn out to be something serious..... A little info on the motor is it is a rebuilt motor, bored .20 over, arias forged 8.8 pistons and only 4500 miles on the rebuild so far.

I'll try and get a video up of my actuall car so you can see exactly what noise its making but it pretty much sounds like the 300zx in the video I posted

NEED HELP ASAP PLEASE

[nissan2.4]

What i would do first is check the valve lifter to cam lobe cleareance. Do this with the engine hot or normal operating temperature, intake valve clearance should be .012- .015 and exhaust should be .013- .016. Now ur problem on ur oil getting burnt that quick, the amount of miles u have on this rebuilt motor should be enough to consider the motor fully broken in. It appears to me that you have excessive blow by that can be caused by incorrect rings or not installed correctly. Lemme know if this helps.

[kpc_0721]

Im no expert on working on cars so how exactly do I check the lifter to cam lobe clearance? Think auto zone or advance auto will have the tool I need to measure it? If I had blow by wouldn't the car smoke beacause mine dosent smoke at all?

[kpc_0721]

Anyone know how to check cam lobe clearance??? Well anyways I just did a compression check and heres how it came out and take into consideration that this has arais .20 bored over forged 8.8 pistons in it...... #1 148 #2 148 #3 145 #4 130 Thinking it could be a stuck valve now but no smoking or anything and would a lifter fuk up the compression on a cylinder? I'm about to pull the valve cover off so anything in specific I should look for exactly other than the obvious? I'll update after I pull the valve cover off n check it out

[kpc_0721]

Someone chime in and help me out here........

So anyways I pulled the valve cover off last night and there really wasnt anything that I noticed that looked out of place like that I could really see, everything looked normal to me but then again I'm no expert and not exactly sure wat I should be looking for? Also the little circular plates that sit on top of the valve, are those the lifters?

So do you think with compression numbers like that the car will be safe to boost because that is what the build of the motor was intended for and I might be a little pissd if I find out I have to tear the head or bottom end apart?

SOMEBODY HELP MY POS 240 OUT HERE......

[nissan2.4]

The way to ceck the valve clearance is you will need a feeler gauge. The circular plates on top of the valves are the lifters. First run the engine till ur temperature gauge is at half. Shut it off and remove ur valve cover. The clearance you are measuring is the clearance between the lifter and the cam lobe. When measuring clearance, make sure the valve is fully closed. When the valve is fully closed, the lobe of the cam will be pointing straight up, and the circular part of the cam will be right on top of the lifter. Sorry if this is confusing but its best i can explain it without pics. Write down the specs i gave you in the previous post. Just stick the feeler gauge between the cam and lifter and write down every measurement for every valve and compare them to the specs. Keep me posted

[kpc_0721]

Gonna try and see if I can get a feeler gauge later on today after my buddy gets off work then I'll go take the measurements, so can just turn the crank pully everytime then to get the lobe's in the right position to measure?

Come on people I know somebody on this site has to know a little something about 240's.......HELP ME OUT HERE AND GIVE ME SOME IDEAS AS TO WHAT IT MIGHT BE!!!

[JDM vs. 318]

I had a knock like that and I thought it was a valve also but after I took everything apart it was a clutch bolt that was making a knock just like that only at low RPMs.

[nissan2.4]

Yeah you can just turn the crank anytime. The crank bolt should be a 27mm, just make sure you turn the crank only clockwise, cuz if you turn it counter, you can cause the timing chain to jumo a couple of teeth

[hessianben]

You had a clutch bolt causing low-rpm knock??? I wonder if that's what i'm hearing?! Usually when the engine is under load, i can hear a knock/rattle. I also hear a valve tap in sync with the rpm's (sounds like rear of valve cover)What did you do to fix it?Thanks!

[Sonikfuri]

May sound stupid, and I'll post more up when I get off of work, but check your oil. My 240 sounds like that when she's low on oil, I remember a few other things, so I'll post em up in a couple of hours.

[stinky180]

intake valve clearance should be .012- .015exhaust should be .013- .016

are these measurements for the SOHC KA or DOHC KA motor?

[BlueMellonPop]

let's not get confused. he has a 300z motor; i think, he's on the wrong forum section. check the video. you can see the motor.

[anumeric]

let's not get confused. he has a 300z motor; i think, he's on the wrong forum section. check the video. you can see the motor.

Nah in the first post at the bottom he says his motor sounds just like the the vg30 in the video.

Wei