rharm78

I found a 75-78 280z flex plate and I’ll get that one to be safe

Good to know. Thanks Mike!!

And yes for my 78’ 620

Mike, sorry the link doesn’t work. It’s a link for an 82’ maxima flex plate. It says 2.4l and it’s a 6 bolt crank. As long as the ring gear is the same I should be good right? I’ll try the link again here : https://www.ebay.com/itm/For-1982-Nissan-Maxima-Flex-Plate-37141FK-2-4L-6-Cyl/392400078582?pageci=ae82c317-8722-4619-8c1a-301eadc17435

Looking for a compatible flex plate for my 620. Would i be able to use one from a 6 cylinder? Found this on eBay. Thanks in advance https://www.ebay.com/itm/392400078582

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

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?

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

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

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

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

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

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?

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!

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