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Topic: 3-point seatbelts into a ’70 521 (long)
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ADrummond
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bullet Topic: 3-point seatbelts into a ’70 521 (long)
    Posted: 30 July 2006 at 7:52pm
I'v been wanting to put them in since I bought the truck, mainly so I can put my daughter's car seat in easily. My 1970 521 has the flat spots in the pillar, but, as I discovered when I drilled an exploratory hole, no threads inside. That would have been too easy! After looking at the B-pillars that Mike Klotz had cut out of a scrapped cab, and wishing I'd done the same when I was cutting up the extra cab I had, I decided to figure out a way to add the seatbelts without the factory threaded bosses. I bought the seatbelts from Fatrodder on ebay, $67 for the pair (+ shipping, about $10 IIRC). On to the photos.

Here's one of the oversized nuts I made, along with the screw and washer (not strictly necessary) that hold this one in. It's about 2 1/4 x 1 1/2", 1/4" thick at the ends and about 3/8" in the middle. You'll see why it's tapered shortly.



The three holes I drilled in the pillar (3/16" and 1/2" diameters). I used a step drill (third photo), because it makes very clean holes in sheetmetal.





Here's the nut going in - now you can see why it's tapered toward the sides. Even after I bent the lip inside the upper edge of the inner sheetmetal down, it still barely fit. I wanted to keep as much material as possible around the threaded portion of the nut, though, so even if it was a pain to get in, it was worth it. I slid it along a piece of wire, and hooked the wire to the lip to keep from losing it. The next photo is of the nut in place, and then there's one of the washer installed with the screws. Last is the upper bracket installed.









In some cases, these seatbelts might bolt right in as replacements, but I had to make brackets to get everything to work right. The two on the left go in the center, and the two on the right go on the outside. They're made from 3/16 x 1 1/2" steel flat bar, bent in the bender shown and with some twist imparted by a big monkey wrench and a bigger vise, then fine tuned for fit with a ball peen hammer.









These were a little trickier than the center brackets. I don't know how the retractors and the end of the belt were intended to be anchored - perhaps with two separate holes in the body? Not having two holes, or an easy way to make something like the nut I used up top, I opted for a bracket with two holes and a clearance hole to recess the bolt head into. I used the step drill again (7/8" this time), though a bimetal holesaw would be fine. Photo 1 is the bracket being test fit to ensure the twist is right and to locate the hole in the sheetmetal. Photo 2 is, obviously, the hole. Photo 3 is the retractor mechanism installed on the bracket, showing the bolt head that's going to be recessed into the hole I just drilled. Photo 4 is of everything installed, and photo 5 shows how the bracket fits flat against the body.











It was a few hours' work, but well worth it. I may still make some changes, like twisting the center floor brackets (or making new ones if they're too short to twist) to better align the two halves of the buckle. They work fine for now, though. My turn signals still don't, however!

Andrew


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dan's_70'521
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bullet Posted: 30 July 2006 at 8:33pm

Andrew,

Those brackets look awesome!  When you are ready to produce more let me know!  I figure if I have better seat belts in the truck my wife might just start feeling better about my little hobby! 

By the way, thanks for the Japanes Gardens info, the wife really enjoyed it!

Dan

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ratwagon
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bullet Posted: 30 July 2006 at 8:35pm
NICE CRAFTSMANSHIP!!!!
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bullet Posted: 31 July 2006 at 5:16am

Whoa, nice work.  Can you take a pic of the setup with the seat installed?  521 seats tend to hug the cab pretty tight.  You thinking of marketing the design?  ;)

Brian
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bullet Posted: 31 July 2006 at 6:34pm
very good quality work and good choice on the more modern seatbelts.
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mklotz70
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bullet Posted: 31 July 2006 at 7:38pm
Sweet!! Nice stuff Andrew! I'll have to sit in it and check where it hits my neck when I come get the brackets.
Don't have to be too bright to be me!
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ADrummond
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bullet Posted: 31 July 2006 at 10:53pm
Thanks for the compliments. No shots with the seat in yet, because I'm still trying to get the rear main transmission seal out. It'll be tight, but I think it should fit. I don't have any plans to market the brackets, but I'd be happy to provide anyone who's interested with dimensions.

Andrew
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ADrummond
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bullet Posted: 06 August 2006 at 2:00am
I finally got around to replacing the output shaft seal on the transmission, so I could put the seat back in - here are a couple photos. The seat is all the way back, and there's about 1/4" clearance. Everything works, but I'd like to modify the inner brackets so the buckle is oriented vertically, like on many other cars. Seat belts in other cars often have a twist in the plastic sleeve holding the buckle up between the seat cushions, but I don't think I have that option.

The object in the third photo is one of the reasons the seat has been out - does anything look different about it?

Andrew





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bullet Posted: 06 August 2006 at 1:58pm
I saw a few days ago how nice a job you did but for some reason can't view the pictures any more...
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ADrummond
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bullet Posted: 06 August 2006 at 5:17pm
Sorry - I moved things around in photobucket (where the photos are) and failed to update the links in my posts. Should be ok now.

Andrew
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Bre620
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bullet Posted: 09 August 2006 at 2:32pm
Originally posted by ADrummond

... one of the reasons the seat has been out


?


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nwdeorg
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bullet Posted: 09 August 2006 at 2:34pm
...Because he changed the transmission. The last photo is where he welded up the hole in the flange so the gear oil doesn't leak out.
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Bre620
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bullet Posted: 09 August 2006 at 3:26pm
right yes yes ... what does this have to do with the seat having to be out ... Is the output shaft seal easier to get to with the seat out?


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datsunaholic
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bullet Posted: 09 August 2006 at 3:52pm
Probably a whole lot easier to get the tunnel plate out with the bench seat out of the way. Then the output shaft is right there.
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dat521gatherer
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bullet Posted: 10 August 2006 at 3:51am
exellent idea and a perfect job. and to think i just scrubbed the heck out of mine in the sink for my 71. i would pay money for that bracket setup. my 72 has the shoulder harness but i never liked the fact it doesnt retract. i shall leave my 72 stock and put in some cool ones like these in my 71. can you make some of those for me by chance?? those look awsome.
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ADrummond
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bullet Posted: 10 August 2006 at 11:54pm
nwdeorg and Datsunholic are right - but it isn't welded in, just a press fit. If you consider a hammer and a block of wood a press, that is.

"can you make some of those for me by chance??"

I don't know - can you fix my turn signals?

Andrew
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datsunaholic
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bullet Posted: 11 August 2006 at 1:43am
Actually "NWDEOrg" and "Datsunaholic" are the same person. I was logged in as the admin to delete the daily dose of attempted spam signups and forgot who I was logged in as.
'64 320
'68 520
'72 521 V6
'74,75,79 620s
'76,78 4X4
'76 KC
'72 510 Wgn
'78 B210
'78,81 510 Wgn
2X '78 510 Coupes
'83 720 KC

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farmtruck
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bullet Posted: 18 December 2006 at 3:55am
life is so cofusing for (some of) us.

      It's just a Farm Truck.
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]2eDeYe
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bullet Posted: 18 December 2006 at 1:39pm

How about some bigger and maybe some close-up pic's of that home built press brake?

dos datsuns
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