Zed Head

Surface preparation is key. especially on cured paint. You'd want to find a good shop and let them know what kind of paint you had sprayed and what you've done to it since. If you've used certain waxes to shine it up it might not be a good candidate anymore for a clear coat. But it is done in the repair business, so the expertise is out there. Look through some of these videos. https://www.google.com/webhp?tab=ww&ei=dq5PVNe5B8j8igLU9ICABg&ved=0CAMQ1S4#q=clear+coat+automotive&tbm=vid

Most new cars today have a clear coat on top of the color coat. It adds a lot of depth and shine and holds it even as it gets dirty. So if you're comparing yours to a new car's paint job, a single coat can't really compete. A clear coat on top of what you have would help, and might not cost much. Stick a piece of clear packing tape on to a hidden spot and you'll see the effect. Hidden, just in case you can't get it off.

Don't the friction materials char and glaze after a few extreme slippages? The flywheel can heat check too. Clutch and transmission problems tend to make people angry, which leads to cursing, abuse, and more problems. The reverse problem could just be a simple hydraulics need bleeding problem.

What's wrong with it?

Why replace the HG? Lost track of the original problem. Make sure to study the dirty parts before you clean things up. Clues.

Pretty sure it's fairly easy to scale the injector duration up after you correct the injector flow rate. There might even be an auto-scale function in MS. The one thing that everyone who runs Megasquirt eventually agrees on, is that every map is different. But really, this is not a Megasquirt forum. Madkaw is the only guy on here that is using it I think. You want to be on Hybridz.org or one of the Megasquirt support forums. This site is good for everything else though.

The turbo is not really the issue since all it does is change intake manifold pressure. It's the ignition system, injectors, sensors, etc., that matter. If you have the same components as a turbo engine but no turbo then a map for a turbo engine will probably work fine. Megasquirt will never use the boost part of the map. You just need a list of the parts controlling the engine to find the right map, for starters.

Check the vacuum hose that attaches to the bottom of the fuel pressure regulator (FPR) for liquid fuel. It might be leaking. The rubber diaphragm inside can fail. And I think that you're measuring the temperature sender, not the sensor. There are pictures in the Service Manual. Go to the site Download area and download the Factory Service Manual (not Chilton's or Haynes, but Nissan) and the Electronic Fuel Injection Guide. Read Engine Fuel and run the tests shown n the Guide.

Sounds more like percolation, I think. Basically, fuel getting too hot in the carbs and forcing/finding its way out unmetered, adding extra fuel, I believe. Still heat-related, so the rubber lines Jeff G described should help. Progress! It's been discussed before, part of the saga. Might even be in previous pages of this thread. Here's Nissan's take on it. - http://xenonzcar.com/s30/files/1973 240z 1974 260z fuel system modifications.pdf That document is on the CZCC site also -

madkaw has Megasquirt. @madkaw

Maybe they'll have second thoughts, after seeing the rush to buy before they shut the the Z section down. They seemed a bit behind the times, with their copied paper catalog pages on their web page. Although, ironically, the other big vendor is going back to phone-in orders since the internet order system doesn't seem to work for them. Amazon and Rockauto type web sites must be hard to create.

Edited - Never mind. Made no sense at all. Just throwing out some ideas. I see some rust on a few of the head bolts. I think that dowels are close to the water passages. Rust grows when it forms, making things tight. And the head bolt that broke might have bent in to the head a bit when it twisted, causing a side load.

zKars' block of wood and a sledge is a good idea. Won't hurt, the wood is soft. I can't remember but I think it might have been part of my "work it off" procedure. My engine was out, on the floor though, so easy to maneuver around. Take a picture of all 14 bolts. We'll count them for you, just to be sure.

Mine wouldn't budge either, one of the center bolts broke off and rust had packed the cavity. Once I got a small gap though I worked it off. Took time. That's why I asked if there were any gaps. If there's a gap between head and block then it's probably not the gasket sticking, it's the locating dowels or a broken bolt. If there's no gap at all between head and block then it might be glued on. If there is even a hint of a gap you can squirt carb cleaner or rusted thread breaker in the gap and let it work. Actually you can do it anyway because there should still be some small passages that will wick in some solvents. Even if they don't dissolve the sealant they might swell it and loosen it it up. If you keep with the lever in the ports, you might want to loosely install some head botls like sb suggested. So if it breaks free from sealant it doesn't cause any damage, or you don't get damaged yourself.

Put it back together without the head bolts and start it up. That should pop it loose.

Where's the link? Is it for sale? Looks like it still has some good parts.

Were any of them rusty? Rust can lock things up. And there are some dowels around a couple of the bolts that can be tight. If you get any tiny gap at all you might try a lever on each end and slowly working/rocking it off. And you can get small plastic wedges from harbor freight to hold any gaps open. Don't stick anything metal n the gap.

Not trying to start an argument, but really, the whole experience of selling the car should be considered. The big auctions are kind of like parties or events that people attend. Having a car for sale and seeing all of the other cars might be worth the fees, and expense of getting the car to the show. Selling the car to an overseas buyer might be fun just for the challenge of getting it done. https://www.carbuyingtips.com/articles/blog/guide-to-the-barrett-jackson-auctions.htm On the other hand you could go like a certain family member of mine who likes a transaction as hassle-free as possible. A sign with a very low price in the windshield of the car, at the end of the driveway. No phone calls, no traveling, the sale is final, no negotiating and no complaints because the price is so low. People just stop in, pay the price and it's gone.

Hate to bring it up but if this is the first time removing it you might find that the breaker plate is rusty and not moving well. If you're lucky you can clean it up before it breaks the plastic bearing cage. Time for a "while I'm here" project, maybe.

I don't know the details but I think that SteveJ probably does, about how the fuel pump relay is powered from the voltage regulator. I think the the N pin on the back of the alternator powers the relay so that the pump only runs when the engine is running. And that small fuse block you show might be the fuel pump fuse, or it might be the one that blew (can't tell which is which is your pictures). In short, you might have a shorted fuel pump wire or fuel pump relay wire. Just a guess. I looked through the FSM and found some things that fit. EF-7 and EE-16. Edit - here's a thread where SteveJ mentions it - http://www.classiczcars.com/forums/topic/47739-73-alternator-upgrade-specifics-with-respect-to-fuel-pump-relay/ @SteveJ

I think that I've read about broken sleeves, or snouts/noses. Comments about aluminum over steel. I have one that has a shallow notch worn it, probably from a throwout bearing that was seized. Edit - found one example. http://forums.nicoclub.com/transmission-front-cover-shaft-broken-t553719.html Edit 2 - notice the comment at the end about the pilot bushing. Don't know if it's true, but worth a look. Might also explain the broken bearing. Not uncommon, I would imagine, to forget to install a pilot bushing when swapping from an automatic.

How wobbly is the main/input shaft? I don't know how loose it could get but if the input shaft bearing is the one that went bad it might have enough wiggle room to contact the throwout bearing support. And the misaligned shafts can cause shifting and pop-out problems. The front covers are all the same for the 71B transmissions, except that the early ones are made of steel. Get that free 4 speed that was recently advertised here and you'll have a replacement front cover.

Where's the broken front cover? The metal debris in your hand is the ball retainer from one of your bearings. Check all of the bearings, one or two will not be the same as the others. Check the nuts that hold the shafts also, one of them might be loose. Which could have caused the bearing failure. Doesn't look terrible. People have shown similar and reported good fixes.

Arne? @Arne

Certainly possible that the carbon is full. It is 40 years old and the material doesn't last forever. It's not a real concern, just an interesting to me observation. That's why I added I added "est" to faint. I have to get my nose right down by the filter to smell the fuel, which I do to check for leaks since there are several hose connections there. Otherwise I wouldn't even notice. Everything works except that my gas cap doesn't hold pressure. Might make the fuel smell more noticeable of course, but I can't follow-up until I find a good cap. The early 280Z caps are not cheap. On the other hand, the system is open and those gas molecules will exit the carbon canister eventually if the engine is not run at speeds off-idle. Another odd factoid - it's a designed vacuum leak.