Steelie Glare Posted April 1, 2015 Report Share Posted April 1, 2015 I was looking for a 720 on CraigsList thinking that'd be the oldest I'd find. I had a 720 KingCab in high school and wanted to get another. Then BAM, there's a 620! 127,000 original miles, automatic and in awesome shape. Long story short, I've now changed out the fuel pump and filter, spark plugs, PCV valve, muffler and have rims waiting. (18" Titan Steelies) Since doing all this work under the hood it's started smoking pretty bad. Bluish, white in color. I have some, not a whole lot, of experience with carborated motors. Any suggestions on what I should check next would be greatly appreciated. BTW, how do I post a pic? For some reason I'm not seeing a way to do that. Lol. 1 Quote Link to comment
abbylind Posted April 1, 2015 Report Share Posted April 1, 2015 Is the smoke on acceleration (piston rings) or in between shifts? (valve seals) Blue smoke generally means oil is burning. Time to do a compression check...and a gander at your spark plugs 3 Quote Link to comment
74datsun620 Posted April 2, 2015 Report Share Posted April 2, 2015 http://community.ratsun.net/topic/54932-photobucket-ratsun/ For the pictures. Welcome to Ratsun!!! 2 Quote Link to comment
Steelie Glare Posted April 8, 2015 Author Report Share Posted April 8, 2015 Cool. Thanks for the info. It's slight smoky while idling but really puffs out while accelerating and on shifts. Looks like white smoke. Also, a new problem has arisen and I'm not sure if it's related. I had my fluid on my automatic transmission swapped out and was told that everything looked ok it was just low. Since then I've had to add an additional quart or two each time I drive. I've read elsewhere that the tranny fluid could be getting pulled in and burnt off. Is this possible? 1 Quote Link to comment
ericsb210 Posted April 9, 2015 Report Share Posted April 9, 2015 White smoke indicates coolant, most likely a blown head gasket. Is it overheating? Loosing coolant? Loosing power? Look under the oil filler cap and on the dipstick, do you see a milky thick tannish goo? On the transmission, where you having to fill the fluid before the change? Is there fluid under the truck after sitting? 1 Quote Link to comment
Grahem Posted April 9, 2015 Report Share Posted April 9, 2015 atf burns white as well, there is a vacuum line from the trans to the intake that has something to do with shifting, if the diaphragm fails on the transmission side you will burn atf 3 Quote Link to comment
ericsb210 Posted April 10, 2015 Report Share Posted April 10, 2015 ^^good to know 1 Quote Link to comment
Steelie Glare Posted April 13, 2015 Author Report Share Posted April 13, 2015 The oil and antifreeze looks good. No overheating or fluids under truck when parking. I hadn't had to add any ATF until I noticed it shifting rough and skipping. I'm certain there is a vacuum issue. Now to just track it down. I'd seen another article on the AT diaphragm going out and it sucking in fluid and burning it here. http://datsun1200.com/modules/mediawiki/index.php?title=Automatic_Transmission 1 Quote Link to comment
ericsb210 Posted April 13, 2015 Report Share Posted April 13, 2015 Glad that it is not the head gasket. Modulator shouldn't be to hard to replace. 1 Quote Link to comment
Steelie Glare Posted April 13, 2015 Author Report Share Posted April 13, 2015 Awesome. I'm hoping to have time one of these days to post some pics. Lol Quote Link to comment
sebpv Posted April 13, 2015 Report Share Posted April 13, 2015 photobucket app, then find pics , click on IMG address, and paste on here. DONE... Quote Link to comment
Steelie Glare Posted April 14, 2015 Author Report Share Posted April 14, 2015 And her new shoes. Quote Link to comment
Steelie Glare Posted April 14, 2015 Author Report Share Posted April 14, 2015 Thanks sebpv! 1 Quote Link to comment
hobospyder Posted April 14, 2015 Report Share Posted April 14, 2015 Dude that thing is gorgeous, how's the interior and under the bonnet? Quote Link to comment
HOGIE Posted April 14, 2015 Report Share Posted April 14, 2015 Nice truck man, but we're going to need more oics than that. Interior, engine bay, ect. Is the green paint in the bed underneath the blue? Repainted? And nice titan steelies! Quote Link to comment
HOGIE Posted April 14, 2015 Report Share Posted April 14, 2015 Dude that thing is gorgeous, how's the interior and under the bonnet? That what I was thinking. I was literally typing the same thing while you posted....question twinsies 1 Quote Link to comment
Steelie Glare Posted April 14, 2015 Author Report Share Posted April 14, 2015 The original color was that light green. Apparently the Alabama farmer who owned it before me wasn't too thrilled with such a happy color. LOL. Quote Link to comment
Steelie Glare Posted April 14, 2015 Author Report Share Posted April 14, 2015 Sorry about the multiple posts...I forgot to show the interior. The driver's side seat is shot, but the passenger's side is like new. Not a crack or even a wrinkle on it! Dude who originally bought it back in '74 only drove it on the farm and to and from the store to get supplies. I'm also not sure what the seats are from. They look like they're era accurate but I know it had a bench originally. Quote Link to comment
hobospyder Posted April 14, 2015 Report Share Posted April 14, 2015 Nice, looks like it's all stock with the l18 in there and still the original Hitachi carb. If it weren't for the head rests I would say z seats but I really couldn't tell you on the seats. Quote Link to comment
Steelie Glare Posted April 14, 2015 Author Report Share Posted April 14, 2015 I was curious about the carb. Guy I bought it from said he just had a new one put in along with the alternator and battery. Quote Link to comment
hobospyder Posted April 14, 2015 Report Share Posted April 14, 2015 Here's a shot pre Weber in my 73. I don't have anything better atm, would have to wander down to the shop to get a picture of the Hitachi so you could compare but that is the original air cleaner you have Quote Link to comment
hobospyder Posted April 14, 2015 Report Share Posted April 14, 2015 Just noticed that thing is an automatic Quote Link to comment
ggzilla Posted April 14, 2015 Report Share Posted April 14, 2015 Those are B210 seats Quote Link to comment
Steelie Glare Posted April 14, 2015 Author Report Share Posted April 14, 2015 Interesting. I was all thinking this was the wrong carb, as rough as it was running when I got it. Now I know... B210? Awesome. At least they're Datsun seats. Quote Link to comment
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