Zed Head

Adjusting the hood rest bumpers and the latch should get rid of the vibration. Looks like you're assuming that air from underneath is lifting the hood and causing it to flutter as it squeezes out. But the vents should help with heat soak of the injectors and the hot start problem. Some people have the hood louvered via stamping. On that video, the guy writes about later 280Z's and hood vents and implies that it was done for hood vibration. Only one of them was functional. Fun fact. Not really clear why Nissan did the vent. It also leaked water on the battery, I think. Something to be aware of. They look good though.

This thread probably has some good knowledge in it, even without the Photo****et non-pictures.

As usual, the FSM has good information. I'd have to have a rack in front of my eyes to know where to put the nipple and observe the outlet but apparently there is a lubrication procedure defined. Also, various grease applications described before this section. 1976 FSM - Steering.

I've never seen the multiple figure pages like that, with the arrow you have to click on to get to the next figure. Didn't know they existed on the carparts site. You're right, there's two versions. Many (some?) people remove parts 17, 18, 20 and 21 and pack grease in there. On the 2nd figure, Aug 73 and up. You can tighten it up a bit too, but you have to be sure it doesn't bind at the extremes of travel.

Was it running correctly when it got "bumped"? How hard was the bump? Where is the module mounted? Check the grounding to the mounting grommets. If it was a hard bump it might be that the air gap in the distributor got moved. Probably worthwhile to go through the basic distributor maintenance described in the FSM. It might not be the module, it might be the distributor itself. Maybe even something simple like the distributor cap got knocked loose.

The parts site shows no change of location over the years. Part 25, I think. https://www.carpartsmanual.com/datsun/Z-1969-1978/steering/steering-gear/25

Some people buy their cars to drive and enjoy. If you've been doing collector cars for years you might just see "restoration potential". There are other types out there! But...this person might not be one of them. Unless he has six other cars that he drives and enjoys. Who knows. "Sep 26 at 11:04 AM veyagus This author's likes: 1 Good run.. Ontarioglen. Almost had me give up. Thanks Skbarsdale. IT will be the 7th in my collection."

So it allows the true seller to stay anonymous. Makes sense now. Seems shady. The240ZGuild might actually be back there somewhere. Edit - actually he's posting on the page. Not clear if he's claimed ownership, have to read more.

Same seller as the one I mentioned above. Who is 911r? Looks like a heavy hitter. 1,470 past listings. Portland, Oregon. https://bringatrailer.com/listing/1972-datsun-240z-339/ https://bringatrailer.com/member/911r/ He made a BaT podcast. Didn't know that there was such a thing. https://bringatrailer.com/2021/02/13/the-bring-a-trailer-podcast-episode-2/

p.s. it should work. Probably best to match the year of booster. Not clear what changed for 82 and 83 280ZX's, which are left out of the fit list.

Here's a good starter Z. The usual been sitting for years but ran when parked problems, probably. https://bringatrailer.com/listing/1972-datsun-240z-337/

The rod from the booster fits in to the spherical pocket. The internal bore doesn't matter for connection to the booster. I'd worry more about getting the booster rod depth correctly set. That's where problems happen. If the internal bore has been enlarged it would affect pedal stroke slightly (more volume would give a shorter stroke) but, as CO points out, it's probably correct down where the piston is.

Autozone says it's right for some ZX's. https://www.autozone.com/brakes-and-traction-control/master-cylinder-brake-system/p/remanufactured-brake-master-cylinder-m51837/719096_0_0

Here's an investment car. Third time on BaT. Three data points on the value chart. $41,250 and $62,500 so far. The presentation gets more dramatic with each listing. Looks like it wasn't driven after the last transfer. Just noticed that this is a 240ZGuild car, on two of the sales. Vague memories of much discussion. 149 comments and 259 comments. The new seller is not the buyer of the last sale unless there's been a name change. Interesting... https://bringatrailer.com/listing/1972-datsun-240z-339/

Did not sell. The seller wasn't very responsive, apparently. https://bringatrailer.com/listing/1970-datsun-240z-123/

Something here might help -

Are you posting about the Z on the Volvo and Fiat forums? Actually, curious, do you have three identical threads running on three different forums? The Z, the Volvo, the Fiat, the house, all updated on three different forums?

Why so much off-topic posting? The title still has Z in it but there's a lot of extraneous stuff. Free image-hosting? I can't remember the last Leaf Green Z post. What's up with it?

Looks like you're getting it figured out. How did he evaluate wipe pattern if the retainers were interfering with the rocker arms? Maybe he centered the lobes on the pads at a certain rotation point and didn't actually see the whole wipe. Or he checked it with the interfering parts and didn't realize. Not clear. Just seems odd that he missed the interference between the parts.

This is interesting. How deep did he go? This would also change chamber volume. Considering the variation and the odd logic it might actually be worthwhile to remove the head and take a close look at what's been done. Trying to grasp sinking the valve seats to deal with "archaic design". Esthetics, function, machining problems? Curious about what he was trying to fix.

Just an observation, but I'd guess that any 80's era ECU of any brand would have those types of parts inside. If you have a local wrecking yard and get tired of waiting. I don't think that electronics were as varied back then, they probably came from the same supplier. You probably know that. Looks like a fun project.

Low number 1970. 5201. Interesting blend of old crustiness, new paint, new parts and lack of critical information. Not sure what to make of it. No engine number mentioned or shown so can't tell if it's matching numbers. Wonder how it will do. https://bringatrailer.com/listing/1970-datsun-240z-123/#comments

I see "taking things apart" but not the corrective actions to be applied. Trying to help formulate a plan of action. Assessing the wipe pattern before going further will tell a lot. Might be that many of the others are actually off the edge but just not too noisy yet.

Might be just me Edit _ I see Diseazd suggested starting with patterns. So not just me. Anyway, more observing and measuring seems in order ...but I'd do the wipe pattern before doing anything else. If all of the patterns are good except the last one then you know you have a one valve problem. What can you fix on the other eleven if lash and pattern are good? Besides that you meed a starting point. The wipe pattern gives you that, telling you if you need taller or shorter pads. Might be a simpler problem than it seems. Good luck.

So, summarizing the state of current affairs, is there a problem besides the