LanceM

Wow that must have been some pump! Considering the inlet size of the needle valve in the carb I find it hard to believe that you could put enough pressure on the needle to force the floats into a full bowl. It may be more of a case of the seat and needle being worn and gas bypassing causing the overflow. A regulator wouldn't hurt and I would set it between 5-10 psi, that should give you more than enough flow.

I'm the second owner and believe the car was all original when I bought it in '79. Mfg date 11/72 HLS30-135546 L24 142045 Original color orange, now yellow. Restored and modified both engine and body.

'73s use both an electric and mechanical pump. If I remember right the electric doesn't turn on until the engine reaches 600 rpm for safety, if the engine stops the fuel pump stops. That way if in a crash the fuel line ruptures and the engine is stopped but the key on you won't be pumping fuel all over who knows what is hot or sparking while you are in the car wonding what happened!! I would not eliminate the mechanical pump myself, but have no problem with adding an electric as a boost pump to the mechanical one.

I understand now. Yes you could use this outlet for a fuel return line but I wouldn't. Doing so would lower the fuel pressure available to the carb, in a high boost situation you might not have enough pressure to feed the carb. I would leave it as it is, you don't need a fuel return line. Cars never had them before the early '70s.

Adding an electric fuel pump won't hurt, it will keep fuel to the manual pump and reduce the amount of work it has to do to keep the fuel pressure up. You don't need a fuel return line, it was added as a way to reduce emissions, a polution control device. I don't quite understand your second question, so I'll answer it this way. You can't use the fuel return line for feeding a carbarator, looking at your attached photo it looks like the fuel pump has two outlets, so I assume that one is currently blocked and would guess that it could feed two different lines. A single line should be able to feed multiple carbs with no problem using a Y or other connector to split the line.

Sounds like you have to pull the tranny to find out but it sounds to me like the throwout bearing "disapeared" if you have that much play, the only other thing I can think of is broken fingers on the pressure plate. Since you'll have it apart I'd think about clutch and pressure plate and a new throw out bearing. I'd probably throw in the 5 speed, no use doing everything twice. Hey and since you have it apart now would be a great time to put on an aluminum flywheel

If the exhaust temps are that high I would have to say that the engine is lean, the only other thing I can think of is restriction in the exhaust system.

Forget the clear ones, go solid. Of course there is a little more work involved but they sure look neat

It's really easy, the only thing you must do is block the timing chain in place so that the tensioner dosen't fall out. if it does you have to pull the front off of the engine to get it back in place. They make a plastic tool for the job, but if I remember right I just used a hunk of broom handle. If you look down inside the front of the block you will see the tensioner pushing on the chain, that is where you need to put your block. Other than that just loosen and remove the rockers, remove the drive gear, 2 (I think)bolts on the cam hold down and carefully remove the cam from the cam towers. installation is just the reverse. You are right that it is easier than a pushrod engine to change.

Gotta tell somebody, the wife don't care After sitting 14-15 years waiting, the Z fired up tonight! Changed the oil, greased the cam and dumped a couple of quarts of oil over the gear train. Turned it over for a couple of minutes with no plugs (30 seconds on 2 minutes off) to get the oil up and around. Put in new plugs and pulled the trigger. She fired right up but wouldn't idle, found the problem to be clogged idle jets (tripple webbers), cleaned them up and now she runs just like when I put her away. Can't believe it, figured I'd have a month of fussing just to get her to start and run. If I had brakes I'd take her for a drive! Love to hear her idle, nothing like the lope of that big arse cam of course the rotted out inlet to the muffler sure adds to the sound ) And to think I was thinking of getting her running and selling her off, NOT GONNA HAPPEN!!! I feel like a kid at Christmas! Well thanks for listening!

for comparison, my '73, mfg date 11/72, vin 135546, engine serial # 142045 Lance

The Cap on the regulator is to reduce noise from the altenator in the radio.

You're probably right, but a lifetime of fixing things is hard to overcome, expecially when you get old I had to try! Besides, I had a bad experiance with rebuilt master cylinders a few years ago, '67 Pontiac, put in 6 rebuilt in 2 weeks, none of them any good. Finally spent the money and bought a new one. I was told that the problem with a rebuilt is that there are no oversized seals, so if a core is honed once it's probably ok, twice maybe, three times probably not. I asked what happened to all of the ones I returned?? " Oh they probably just rebuild them" !!!! So much for quality control! So I'm sort of shy of rebuilt things that get honed out as you can see.

Well it's been decided, I had to try but that piston won't come out. Drilled and tapped and busted off a screw using a slide hammer trying to get it out! Never had that much trouble pulling door locks, oops I mean dents out! Time for a new one, well I had to try! Thanks again, Lance

I would only cut back until I had good metal, find a doner, cut to fit, flange, weld. If you are looking to remove the whole quarter you will have to drill out all of the spot welds holding the pannel on and make a cut somewhere behind the roof gutter.

I just saw a tank for sale on line in the last day or two but I'll be dogged if I can find it now. Good ones are still out there. Lance

You could try leaving the cam in place and moving the towers as a set. Bolt them in place and see if the cam turns freely or if it binds. Probably not the best way to do it though... Taking the towers off a head and then putting them back on the same head is one thing, moving them to another I would think that they would need to be line bored. Just my $.02

Thanks for all of the replys. I have it soaking right now and when I get home tonight I'm going to try one more time. If I can't blow it out then I'll try drilling and tapping and pulling it out. The bore that is exposed is perfect, no scores or marks and I believe the piston is stuck with dried gunk. I figure I've got nothing to loose, if I wreck it taking it apart I was going to have to get a new one anyway. Rick I'll get back to you on that rebuilt unit if things don't go well tonight! Thanks, Lance

What comes in one? do you get new pistons or just seals and springs? I can't get my front piston out, may be just crud but it won't blow out. I figure I can drill and tap a hole in the end and pull it but if new ones don't come with the kit it's time for a new master cylinder. I'm hoping that someone has been there done that and can tell me what comes in the kit or another way to get the piston out. Looking forward to any hints, Lance

Did some looking on line and have found rebuild kits and pistons (pucks ), new pistons are only $6 a piece so I won't even bother messing with the old ones. I find it interesting that a rebuilt caliper is about $26, a new piston is $6 and the rebuild kit is $4 for 2, pin kit is $6. I can rebuild both of mine for what one would cost and have beer money left over! Thanks for your replys guys!

Right, but the rust is the other way around, or should I say at the other end, the exposed end. Fully compressed I don't think the rust will touch the o-ring, the puck is like new from 1/8" in from the outside to the inside. Batteries are dead in the camera or I'd take a picture. Anyway I don't believe that rust will touch the inner O-ring from fully compressed to fully extended, if it does touch fully compressed it will only be during installation as the puck should move out enough after first use to be past it. Another question, are these rebuild parts available at the dealer or is there another source? I've been out of needing Datsun parts for 14 years I ordered a MSA catalog last week but they still haven't charged my card, are they usually slow on getting catalogs out??

Too weird to be true!!! Glad to hear that it's back together and ready to roll!!! If all fixes could be so simple, and less difficalt to find!!

My 240 has been setting for 14 years, it had new brakes when it was put away. I've taken off the calipers and have popped the pucks out after a little work. They were pretty much fully compressed when on the car but rusted to the caliper a bit in front of the inner o-ring. No rust in the body or on the puck other than the outer 1/8". My question is after cleaning should these be OK to rebuild? I'd rather rebuild these than buy rebuilts. I've had bad experiances buying rebuilt parts for old cars, you just never know how many times they were rebuilt, and I can't afford new at this time. I'm figuring that since the rust is in front of the inner O-ring this won't affect anything once it's cleaned up. Am I right or greatly mistaken??? Lance

Ok, so the mounting points are correct and not the problem, brake worked before and didn't rub on the rotor. You had the rotors turned, did you replace the bearings and races or are the original ones being used? (this may have been posted before but I want to be sure) In either case you must have replaced the seal, is it the correct one? If the ID of the seal is too small it will be butting up to but not going over the seal area of the spindle, everything would appear to tighten down correctly but the rotor would be spaced out. Did you put the seal in the right way? (searching for clues here) the open side of the seal should go towards the grease you want to keep in. Last as was mentioned before, if you replaced the races and the inner one wasnt seated fully this would cause the problem too. I don't think you bent anything, the wrench or wheel would have broken first.

Yep I remember now, no gear, well it's been awhile and a lot of other cars since