minimechanic Posted September 30, 2012 Report Share Posted September 30, 2012 so, i just took on an abandoned 20 year old project my grandpa left behind at my uncles. its a '79 620 p/u, 20 years ago the cylinder head warped and blew. 5 years pior to that the motor was swapped cause the original L18 died, so im having some big issues determining whether its a L20 or L22... can anyone provide some insight? Quote Link to comment
Wide14u Posted September 30, 2012 Report Share Posted September 30, 2012 it should say on the side of the block Quote Link to comment
minimechanic Posted September 30, 2012 Author Report Share Posted September 30, 2012 it was a 20 year old abandond project my grandpa had left behind, its now my project. just started really diggin around it yesterday, already found all the parts in my garage and a extra cylinder head. the problem.... dont what motor is in it. im not familiar with Datsuns but what i do know is its not the L18, it say Nissan Z on both of my valve covers. im hoping ill have it running if not close in a month or two though, atm im working on getting it off the ground. all four tires are dead flat, but not roughted. luckily its been in a garage all these years Quote Link to comment
RedBanner Posted September 30, 2012 Report Share Posted September 30, 2012 Thats a napz motor, the next genaration after the l motor. Quote Link to comment
Wide14u Posted September 30, 2012 Report Share Posted September 30, 2012 Its cool it has ac in it Quote Link to comment
RedBanner Posted September 30, 2012 Report Share Posted September 30, 2012 Napz motor, the bottom end is used alot, but you dont see many trucks using those heads, you should read up on the lz motor builds, where people use l series heads on those motors, its a common, easy way to make a torquey little motor. Quote Link to comment
Willdatsun Posted October 1, 2012 Report Share Posted October 1, 2012 Nice! love seeing old 620s like this getting some love. 1 Quote Link to comment
Farmer Joe Posted October 2, 2012 Report Share Posted October 2, 2012 lol... its says right on the top, bud.. thats a Z-series nissan engine. under the exhaust ports on the block will be a flat area with either z20 z22 or z24 stamped on it.. im going to be doing the same swap here in a few weeks. ive got a z24. Quote Link to comment
minimechanic Posted October 6, 2012 Author Report Share Posted October 6, 2012 thats the problem, theres nothing stamped on the motor. i searched all over the block and found nothing, the flat spot is blank Quote Link to comment
minimechanic Posted October 6, 2012 Author Report Share Posted October 6, 2012 im actually looking into Nissans SD33T motor, inline 6 turbo diesel. Quote Link to comment
minimechanic Posted October 6, 2012 Author Report Share Posted October 6, 2012 she currently has Nissan Z motor, ive been doing some research and have taken an interest in the inline 6 turbo diesel made by Nissan in the early 80's (SD33T). anyone done this? or have info on doing a diesel swap? itd be greatly appreciated Quote Link to comment
Z-train Posted October 6, 2012 Report Share Posted October 6, 2012 Stop looking. Quote Link to comment
datzenmike Posted October 6, 2012 Report Share Posted October 6, 2012 It's on the driver's side below the #2 spark plug between the two exhaust pipes. Stamped into the very top of the cast iron block where it meets the aluminum head. Probably a Z22 as the cast aluminum valve cover is consistent with that motor. The Z24 uses a stamped steel one painted black. This must be the third motor in it as the '75 and up trucks had L20Bs in them. . Quote Link to comment
datzenmike Posted October 6, 2012 Report Share Posted October 6, 2012 You have three posts about his truck and it's going to get very confusing having people reply to one and knot know there were answers on the other two. I've combined all into this one to keep everything discussed together. If you plan to make a project of this truck start one (1) in the projects section and I'll move all this over to it. Otherwise here is fine. If you have questions say, about the transmission, ask them here so that the answers are directed here and they are easy to look back for. 1 Quote Link to comment
Willdatsun Posted October 6, 2012 Report Share Posted October 6, 2012 I would have thought an SD33 being 6 cylinder is way too long for a 620 engine compartment! They are also very heavy, which won't make steering much fun, not that you'd ever get one to fit that is, and I don't know how you'd connect it to the transmission anyway, aren't SD33 always on 4x4 trannys? A 4 cyl diesel from a newer Nissan pickup might be your best bet. Quote Link to comment
minimechanic Posted October 7, 2012 Author Report Share Posted October 7, 2012 i wasnt sure cause in a few things i read it had stated they were put into the 720's, i know theyre in the Scouts and usually have a T19 transmission, but im sure there are other compatible ones. it was just an idea i was looking into though, im sure ill run the Z motor for awhile till i find a motor i really like Quote Link to comment
minimechanic Posted October 20, 2012 Author Report Share Posted October 20, 2012 so im now looking towards a new clutch for this truck, i already the clutch line replaced with steel braided tubing. anyone have suggestions for the clutch? Quote Link to comment
]2eDeYe Posted October 20, 2012 Report Share Posted October 20, 2012 Sach's are good clutches. http://www.zf.com/na/content/en/united_states/sachs_us/homepage_sachs_us/homepage_sachs_us.html Quote Link to comment
minimechanic Posted October 27, 2012 Author Report Share Posted October 27, 2012 well ill be damned, both my cylinder heads are bad. the journals for the cams are worn and damaged, its a Z22 motor. so the clutch is on hold till i find a new head, ive down some searching but turned up 0 results... no bueno! are there other heads i can use on the block? or potential modes with a larger cam? Quote Link to comment
izzo Posted October 27, 2012 Report Share Posted October 27, 2012 Grab an L series head and throw it on there. Profit... 1 Quote Link to comment
minimechanic Posted October 27, 2012 Author Report Share Posted October 27, 2012 but what L series head should i get? im unfamiliar with nissans, my knowledge is mostly on chevy, bmw, and vw. so basically im a newb and need detailed info Quote Link to comment
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