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rharm78

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    49
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About rharm78

  • Rank
    Newbie
  • Birthday 12/23/1997

Profile Information

  • Gender
    Male
  • Cars
    1978 620
  • Interests
    Marching Band, Driving my Datsun
  • Occupation
    Machinest/Mechanic
  1. rharm78

    78 Datsun 620 Smog help

    Well the headgasket is good I hope lol. I just replaced it
  2. rharm78

    78 Datsun 620 Smog help

    Wet compression check? As in adding oil to cylinders to see if the compression goes up? Isn't that a tell tale sign of the rings being bad?
  3. rharm78

    78 Datsun 620 Smog help

    True. I'll add some atf and do a compression check before and after. The engines already going south I don't think much can hurt it lol
  4. rharm78

    78 Datsun 620 Smog help

    Well I know the truck externally leaks oil pretty bad. Also hence why a rebuild probably isn't a bad idea. It doesn't smoke. At least not that I ever noticed. Actually I take that back. The one time I remember it smoking was once when getting on the freeway, the auto tranny kicked down and I looked in my rear view mirror and there was definitively something. It was at night, but I could see a large cloud coming out of the exhaust pipe through the headlights of the car behind me. It worried me for a while but it never smoked any other time. And it was a rare instance where it kicked down to a high rpm
  5. rharm78

    78 Datsun 620 Smog help

    I'll have to check the carb later. Probably tomorrow when I do compression check. I use a quart at least every 500 miles.
  6. rharm78

    78 Datsun 620 Smog help

    Yes after I warm the engine up with throttle wide open, right? I should be able to check that on Saturday. I have a long commute everyday so I don't get home until it's too late to work on the truck
  7. rharm78

    78 Datsun 620 Smog help

    So should I try these on an engine that's already worn out or should I go for a rebuild? About two years ago I did a headgasket, the bore looked good. No deep marks. Probably could get away with ball honing it? That's probably what I would end up doing. Install new rings and a valve job. New oil pump. Put it back together and reinstall. I would do an in-frame but the rear main leaks pretty bad, along with other external oil leaks so mind as well pull it. The timing chain isn't even 10,000 miles old, would I have to replace that? I assume not. But as I said before if it is worth it to just keep driving then I will do that
  8. rharm78

    78 Datsun 620 Smog help

    I'm running 20w50 right now. I know it's not overfilled I checked it yesterday before I started it. Again I knew that the hotter plug was not going to fix my oil consumption issues. I thought it would buy me more time because I did not realize it was this close to needing a rebuild. So I guess the reason why it is not passing is the engine is so worn out its burning to much oil? That sucks lol I was thinking about doing a tranny swap anyways so I guess this is my chance. I know this may be ignoring the obvious answer which is oil consumption, but could it be an egr or anything like that?
  9. rharm78

    78 Datsun 620 Smog help

    I also run 91 because its what the manual says with all the emissions crap. And thank you so much for all the replies so far!
  10. rharm78

    78 Datsun 620 Smog help

    I went with the hot type plug because i figured if i had a hotter plug it would burn more or cleaner? I replaced them awhile ago but the truck has not had too many miles since then either, like maybe 1,000 but i doubt that. Probably more like 600 ish. I thought regardless if it made a difference it was still a plug that is recommended in the factory service manual i have so it should be ok. But it was just something i thought i would try, i did not expect it to solve my engine issues. I know the engine is worn out, but it still has some life in it. If i can get it smogged and drive it once a week(if not more) that would be awesome. Yes the engine does consume oil, but i did not think it was to the point to where it was fatal. and if it is then its rebuild time
  11. rharm78

    78 Datsun 620 Smog help

    yeah i know theres lots of oil on the plugs, more then i expected :( last time i did a compression check i had just adjusted the valves(this was less then 300 miles ago) and i believe it was cold and i did not hold the throttle wide open. If i should retest it under these conditions i may have time to do that this weekend.
  12. rharm78

    78 Datsun 620 Smog help

    Front of the truck is towards the left, spark plugs in order BP5Es-11, its what the manual recommended for a hotter spark so its what i used I did not check the gap, but i will when i get home
  13. rharm78

    78 Datsun 620 Smog help

    I can check the spark plugs right now since i just let the truck warm up. Burning oil could be a possibility but compression is good, could it be burning that much? Thermostat does not open until just before halfway on temp gauge, i warmed it up to check that. As for the carburetor i sent it to a carb shop about 4 years ago. It was completely overhauled then and passed smog soon afterwards, but the Cat was also brand new at that time Pretty sure the choke isnt sticking. That would also cause the high idle to be on which it isnt. As for the jets i have no clue like i said i left that to a shop. I tried rebuilding it once, and did not do a good job so i had it sent out. It seems to me that at my friends shop it seems fine because it is under no load, the engine is in neutral because he doesnt have a dyno, just the CO meter. Once it gets on the dyno for the test, it fails. But he works on vintage 911's and he checks all of them that way. I will pull the plugs right now and post a picture. Also spark plug wires are less then 4 years old, but i have new ones that im gonna install. I'll double check cap and rotor. Truck has electronic ignition because it is a 78'
  14. rharm78

    78 Datsun 620 Smog help

    Just in case the first image is too small
  15. rharm78

    78 Datsun 620 Smog help

    So im trying to get my 620 smogged. I have a friend who has a CO meter and it seems to be ok until i take it to get it tested and then it fails, by alot. The plugs are okay air filter ok and it has a new smog pump. Any ideas appreciated, but I will not be putting a weber on it and it needs to pass. Thank you!
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