Jump to content

new member, first post.


Recommended Posts

Hello Ratsun members.


I want to start by saying thank you to all that have shared so much valuable info. My son and I started a frame off restoration on a 71

521 this past May.








I had 2, 521's when I was young and managed to find this red racer last spring, nice dog house hey. :thumbup:

Will post this as a test then send more pics soon to show where we are at.

  • Like 4
Link to comment
  • Replies 311
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

The truck will be mostly stock, my son would like to see it lowered with some new paint and modern rims. We've been doing our research on ratsun and will probably do a disc break upgrade. We have a short time line of a year from now till he's driving to get the truck done. So with that we will re build the 1600 for now and possibly a Ka and 5 speed swap after its on the road. The original bench seat was re foamed and upholstered along with the door panels,  sun visors and dash pad.



  • Like 7
Link to comment

Here are some pic's of where we are at.



The original 521 on the left and a parts truck we trailered from 5 hours away. We ended up getting a usable windshield, box and tailgate, rear bumperettes, bench seat etc.






The cab and box was soda blasted and epoxy primered. now comes the rust repair.



  • Like 5
Link to comment













So the passenger side is almost complete for metal repairs, now on to the drivers side. Also had the frame sand blasted and epoxy coated in a satin black.



  • Like 5
Link to comment

Unfortunately the parts truck is gone for the king cab option but we can see a light at the end of the tunnel for our rust repair. I see a chevy 3100 in your garage Wayno, thats what i restored for my first vehicle, very nice. The rockers we had bent up from some 18gauge at our local fab shop, gave them the old rocker for a template. The primer hasn't been to much of a hassle, just figured it would be nice to protect the raw steel.

  • Like 2
Link to comment

It was actually a commercial 1 ton longbed as it had the suspension that the big trucks have, it was a pain to find suspension parts for until I went to a commercial spring place, that is when I found out that they used that type of suspension into the late 70s, but the classic truck places didn't have/carry them parts, and were not forthcoming on where to get them either except for Dans Classics in Portland OR, he told me where to go when the other places played dumb.

That truck is in England now.

  • Like 1
Link to comment
  • 3 months later...

More and more metal work. Almost completed cab, finishing off drivers side floor pan, new rocker inner and outer, cab mounts and corners. My son is getting to be pretty good with the mig.








Had to cut drain hole from old rocker and add to new one.






We had to make new cab mounts and floor supports, (pieces under floor with gusset sides).




Also had to fill drilled holes in roof from previous dome lights. Used nails to weld in place then grind off spike of nail.







Looking forward to switching it up, were thinking engine rebuild will break up the monotony.

  • Like 4
Link to comment
  • 1 month later...

Going to look at a L20b this weekend, it is all apart and machining done. Would like to go prepared with specs on bore size and crank journal dimensions to make sure all is good. Have searched ratsun via google with no luck. Can anyone help with the specs I should be checking? Thanks

Link to comment
  • 5 months later...

We purchased the L20B, had the block bored 20 over, decked and crank turned 10 under. The head which was previously re built was checked over and given the thumbs up.






We plastigauged the main and rod journals as well as checked gaps on the new rings. They could have been an issue, had to file gap to spec.


38556413624_58eca2d808_n.jpg          38556410154_de26ed13ee_n.jpg                  25397281688_80f0731642_n.jpg



As for the truck body my son and I completed the metal work (still have to do the box}. Hired an expert to do the final body work which keeps the sanding mess out of our garage.


38556417674_abdbd31ac9_n.jpg   38556412194_c1b43ac3be_n.jpg   25397282648_64e13d773b_n.jpg   



As for the chassis, the differential is in with lowering blocks. Assembled the rear brakes and pressed in the new LCA inner bushings.



 38556408354_c409a2340c_n.jpg   38556406274_aaf6f7d413_n.jpg



As for the rear breaks can anyone comment on the placement of the bottom smallest spring holding tension on the shoes? Not sure if it's hooked in the right spot. the reference material we have doesn't show it clearly.







  • Like 4
Link to comment

As for the rear breaks can anyone comment on the placement of the bottom smallest spring holding tension on the shoes? Not sure if it's hooked in the right spot. the reference material we have doesn't show it clearly.



I want to say there's a hole on the rear plate of the brake where the short end of that little return spring (one end of the spring has a hook that's longer, one end is shorter). I didn't stretch that spring between holes on the 2 shoes. I'll see if I have a picture.

  • Like 1
Link to comment

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...

Important Information

By using this site, you agree to our Terms of Use.