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About NC280z

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    1975 280z, 1987 300zx *sold*

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  1. Looks like filing it by hand was the solution, don't know why I didn't think of it before. I'm honestly just surprised that the hub had been damaged, I have no clue what could've caused it.
  2. I thought it might be a wheel/tire, but I've swapped wheels and only the driver's side has the shake. I've got the car on stands and when you spin the wheel it's pretty visible that the wheel isn't evenly mounted to the hub on the driver's side, due to the ridge. I'll go snag a photo and post it shortly.
  3. Good evening all! I've finally located the cause of a mild, persistent wheel shake. It would appear that the driver's side front wheel hub has a slight ridge near the rim between two of the studs, which is preventing the wheel from mounting flush. The ridge isn't significant and should be easy enough to flatten, but I'm looking for some guidance before I take a drift to it. What's the best way to flatten out the ridge? OEM hubs are NLA, so I'd be looking at T3 replacements if I can't fix the stocker.
  4. NC280z

    Rebuild N42 Head

    Fortunately they sent a return label without any difficulties, I'm just waiting on it to arrive at the retailer for a full refund. Based on the box the head came in, it would seem that Go-Powertrain is a storefront for Allied Motor Parts from GA, and AMP does not have very good reviews. Oh well, on to the next project.
  5. Hi all, I was doing a bit of work on my '75 280z and noticed something odd on my passenger side strut tower. The seam closest to the front of the car for the passenger side strut tower has a few spot welds that are curled up, the rest of the strut tower spot welds/seam is nice and flat. I've owned the car for 7 years, and I don't recall the previous owner mentioning any sort of accident history. Is this indicative of damage from an accident, or just something resulting from age or factory oversight? Nothing around the area is wrinkled, or suggests any sort of major accident.
  6. NC280z

    Rebuild N42 Head

    The pits on the deck were my biggest concern, that and one of the valve guides is so corroded that it looks like the upper portion of the guide is missing. Overall, it looks like they shaved the head, painted it and shipped it out. I don't know how you get so many metal shavings in the box it was shipped in, it's as though they took it off the mill and just chucked it into a box and sent it out. Not too happy, I've sent a polite request to return the item, so we'll see how it goes. As always, I appreciate your input (and sanity check!) datzenmike. I'm glad I wasn't over-thinking this one.
  7. NC280z

    Rebuild N42 Head

    Good evening all, I recently purchased a rebuild N42 cylinder head from "Go-Powertrain" to prep for a larger cam and use on another build and noticed some things with this remanned unit. Cylinders number 5 and 6 have a bit of pitting, both in the chambers and on the deck of the head. I haven't measured the head yet, but I'm guessing it's been shaved a bit, as there's metal flakes all over the head, and some of the flakes are trapped under the valves along with bits of shop rags and other debris. Would these pits present much of an issue? I know that pitting is usually a sign of ca
  8. Good afternoon everyone, I'm restoring my '75 280z to the original radio system and need some help figuring out the polarity for the single (mono) speaker that these cars came with. The original speaker is missing, but the stock white and white/black wires are still there. The FSM and factory diagram available from XenonS30 and other sites do not show which color wire is which polarity, and the replacement Hitachi speakers I've acquired from a Datsun 1200 have the striped wire going to the negative side of the speaker. Does anyone here still have their original speaker
  9. So it's been a few weeks and I'm happy to report that the oil leak has been resolved. I just figured I'd do a follow-up in case someone else runs into a similar issue, I'd recommend following the Chilton/Haynes manual's advice of coating the side-seals with RTV rather than with engine oil as recommended in the "How to rebuild" book.
  10. That helped, thanks! I ended up purchasing a 260z expansion tank, as it's made of metal (early 240z are plastic) and it had all the requisite vent inlets. It's very odd that the stock '75 setup didn't have all the correct inlets, I'm not certain what the stock setup would have done to ensure proper tank venting with all the extra outlets.
  11. Good evening everyone, I'm doing a refresh of the fuel system to my '75 280z (changed the topic of the original post to suit), and I've got a quick question regarding the vent lines on the expansion tank and the outlets on the fuel tank. It looks like the '75 model year was an oddball for differences between the fuel tank and expansion tank, as the fuel tank has 3 vent tubes but the expansion tank only has connections for 2 vents, plus the line that runs up front to the evap canister and a line to the fuel-filler neck. The main difference is that the '75 and older fuel tanks have a
  12. I appreciate the quick responses! I tend to drift towards the worst-case scenario when I notice things like this. I had a machine shop bore and hone the engine, and I reassembled/refreshed the engine with new internals about 7 years ago and never noticed the damage during the reassembly process. During today's inspection I also noticed deposits on all of the pistons (see below), but all of them have this same even coating of deposits, which I'm guessing is normal for an engine like this. My idle AFRs are between 12.5~13.5, so a bit rich. N42/N42 with flattops, so compression is around 9.69~1 a
  13. Hey all, I decided to sneak an inspection camera into my Z's engine during some routing tune-up procedures and found a nick in the cylinder wall of the #3 piston, near the top of the bore. Attached below is a photo of the damage. The car idles well and draws a steady 20" of vacuum once warmed up, though I've not yet done a compression test to see if this damage has affected the engine overall. I also searched the bore for any foreign objects and couldn't find anything, so I'm not certain what would have cause this damage. Is this something I should be concerned with and address qui
  14. *FINALLY* figured out what was causing my leak. The side-seals were not sealing correctly and were allowing oil to pool up in the seal's registers and then leak down through the oil pan gasket. This also explains why my leak would continue even with the engine off and the car on a level surface. The registers for the seals were basically acting like little reservoirs of oil that would continue to leak until the next startup, where they'd refill and then continue the cycle after shutting the car off. Both of the old seals were completely soaked with oil when I removed them, and not all of the o
  15. I'll look into "the right stuff" gasket maker, all the threads that I've read on other forums have indicated excellent results. Could I use the right stuff to seal the front cover and rear main joints at the points indicated in the FSM and use a gasket as well? I ended up putting my car on stands and used my UV light to check for leaks last night, and it looks like both joints for the rear main have a slight leak, possibly due to the RTV not sealing up well enough. One quick question on side-seals, the "how to rebuild" book recommends leaving around 1/16th of the side-seal stickin
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