Rust Advice 78 280z

[gotham22]

The car did not always make this sound. My first step is to find out where the smoke is coming from. 

In case you missed it here is what I did to the engine while it was out of the car

Engine Work done:

new fuel injectors

oil pan gasket

lashed valves

replaced EGR

new oil filter

rear main seal

pilot bushing

[Dave WM]

a large bore rubber hose (like a heater hose) held up to the ear and then move the open end around the engine bay may help zero in on the noise. it sounds external. this technique is very good at finding exhaust leak noise.

[gotham22]

I bought a car stethoscope to do that. Hoping to have time this weekend to troubleshoot.

 

[Racer X]

2 hours ago, gotham22 said:

I bought a car stethoscope to do that. Hoping to have time this weekend to troubleshoot.

 

A stethoscope won’t “hear” an exhaust leak. It is great for tracking down mechanical noises though, like that knock on the video.

[Patcon]

A little story...

I had a 95 suburban that went in for an oil change. Well they forgot to refill the oil but I really couldn't prove it. It had a rod nock after that. A local racer told me to run 20w-50 in it. Quiet as a mouse. We ran it that way for a long time

[gotham22]

Been slow progress but I wanted to send an update.  Oil pressure seems good.  Its around 20psi during idle. I also fixed the down pipe exhaust leak (noise is still the same).  Next I am going to do a compressions test and then check timing. Again thank you all for your help

 

 

 

 

 

[gotham22]

great news!  it was just a valve adjustment when the engine was hot. 

[Dave WM]

did you find one super loose? that was a lot of noise for a valve setting. 

[gotham22]

there were a couple that were loose. I adjusted it while hot.  Then I ran the engine and did a second adjustment.  I think I finally got it.  Sounds good now, right?

 

 

[Dave WM]

sounds fine, maybe the microphone in the camera was making is sound louder, I mean it was REALLY loud before, more than a typical valve tic.