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Jon's AD3 720

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About Jon's AD3 720

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  • Location
    Mount Vernon, Washington
  • Cars
    1983 Datsun 720, 4x4, King Cab
  • Interests
    Being outdoors, riding my Harley, working on my vehicles, and spending time with my wife and kids.

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  1. Jon's AD3 720


    are you talking about valve lash or the amount of acceptable movement, side to side if you will, between the valve guide and the valve?
  2. finally got time to tackle this head. i thought i would see more damage to the head gasket as well as the exhaust manifold gasket seeing as how i had coolant in the oil as well as coolant squirting out between the head and the exhaust manifold. I still need to test the head for warpage. intake valves look good. exhaust valves have very minor pitting. the seating surfaces look good. (i forgot to get a picture of this) i have not inspected the valve seats yet. (tonight). i will have the head dye penetrant tested this weekend for cracks since my head gasket had no visible damage. Questions: if a coolant passageway opening interfaces with a metal inner ring of the head gasket is that a source of gasket compromise? there are also coolant passageways in the head and block that do not have corresponding holes through the gasket. is this normal? (shown in picture above. teardrop imprints in the filter.) some of the threaded holes in the head that bolt the exhaust manifold on are stripped out. should i high temp epoxy studs in these locations? it appears that is what the previous owner has done on some of the exhaust and intake holes. ( shown above. guessing the three posts on my head aren't factory done) Or should i up-size the hole and re-tap and use larger hardware? what is the torque spec for the Intake, Exhaust, head, and rocker arm bolts? besides replacing the head bolts, is it advised to replace any of the other bolts? does anyone have the part number for the aluminum valve cover gasket? NAPA gave me the rubber one which i believe is for the stamped steel cover not the cast aluminum one. from my research i need a cork rubber gasket. i have the raw gasket material and i could make one if needed. any help would be greatly appreciated. getting started "Milky" mess cleaned up somewhat. still need to finish prepping block surface. bought a wedge off amazon that didnt work for shit. ended up making my own out of wood. pretty filthy valves. keeping things organized.
  3. Time Left: 8 days and 16 hours

    • WANTED
    • USED

    looking for a Z24 head. not sure what year truck it came out of, but it is in my 83 720. i have a few potential donor vehicles, but if someone already has one pulled i would prefer that. i am located in NW WA. im not looking to pay an arm and a leg on shipping. let me know what you have.


    Mount Vernon , Washington - US

  4. i know i have read it before, but i can not find the thread. mike i think you said that buying OEM gaskets will get much better longer lasting results over cheaper aftermarket brands. where do i order those (intake, head, exhaust, and valve cover), and does anyone know part numbers for those?
  5. I have seen your previous posts about blocking the chain tensioner I will buy that plastic wedge tool. Let the fun begin.
  6. inspected some more. my oil level is fine. and it isn't smoke coming out of my exhaust it's steam. i have coolant coming up out of the rear exhaust manifold gasket when i start it after it sits warm for a few minutes. i also have milky oil stuck to the oil cap. so i have water in my oil, i have a bad exhaust manifold gasket for sure, I have a bad head gasket, and i may have a bad/cracked head letting water into the exhaust and oil. am i diagnosing this correctly? do i have a bad head gasket for sure? Is my next step pulling the head straight away? Shit! 😕
  7. I was a quart low on oil the other day so i put a quart of Lucas heavy duty oil stabilizer in instead of oil and now my engine is smoking a lot more than it used to ( from the exhaust). i have the Z24 that was rebuilt in the last 3k miles. should i not have used the Lucas? is there a reason why the Lucas and the smoking would be related and occur at the same time? Also, i don't know if it is related, but i think i developed what sounds like an exhaust leak coming from the manifold. this also started the same day that i added the Lucas stabilizer. are these all related, or does the smoke and exhaust least have nothing to do with the Lucas? i haven't done a soapy water test on the exhaust yet, and i haven't done a compression test since the symptoms occurred either. any ideas or thoughts on the Lucas Oil? i don't know if this info sheds any light on a potential solution, but my compression from the front of the engine to the back was 146, 126, 141, 142 before these symptoms. the engine purrs smoothly at idle when it is warmed up, but you can still hear the "ticking" sound that i think is the exhaust leak. when i accelerate the sound gets louder and more frequent. the sound does not go away from thermal expansion as the engine warms up either. any ideas? thanks.
  8. You aren’t talking about these right? I think we already talked about the 1” ish drain holes in the floor pan, and this is what I used for replacements. Hope the amazon link works. I still have to get to get my floor pan dried in. I sunk it in a puddle last week and got a bunch of water and river silt inside. 1" 1 inch Flush Mount Black Plastic Body and Sheet Metal Hole Plug Qty 10 https://www.amazon.com/dp/B00PEZS37I/ref=cm_sw_r_cp_api_i_kkICCbZ8JHJFA
  9. I bought a replacement carpet for my 83 720 at Auto Custom Carpets Inc. I haven’t installed it yet because still have some work to do on my floor pan, but it appears to be custom fitted for the truck. Several colors are available.
  10. Wish I could make it. Gotta work tomorrow. Might be taking a Monday-Friday shift soon, so I hopefully will be able to make it to future events.
  11. all three have brown interiors. two of them are rough.
  12. i have three potential parts trucks north of seattle. 84/85 720 4x4
  13. a few updates. working on the floor pans. wired and installed new speakers in the toe kick. did these trucks come stock with only two speakers in the toe kicks? rewired the dome light and door open sensors. finally got the original service manual does anyone have a good method to seal/fix these pin holes at the base of the toe kick? once i get it dry and rust free i will paint with rustoleum and install the carpet.
  14. go to your local junk yards and try to find a a comparable donor truck to get parts off of. may be hard to find, but that is a good start.
  15. Well I figured there was something thicker than 12 or 13 gauge steel down there, but I haven’t dove into it yet. I know a few good fabricators and have access to metal so let’s see what happens ?
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