Carb issue(old Datsun)

Hey guys,

Well some may remember I bought a 78 Datsun 510 two door hatchback a few months ago. Well this morning I started to dis-assemble the carb for a rebuild,and I either lost a small spring,or it wasn't there to begin with. I removed a cap screw in the centre section of the carb,and looked down in the hole,and didn't see anything that would fall out. I then flipped the carb over,and heard something fall out and plunge into the tupperware bucket of carb cleaner I had open. Well I quickly looked at the exploded view of the carb on the rebuild sheet,and saw that it was a check ball,weight,and spring that fell out. I used a magnet to get the check ball,and I fished around with my gloved hand to find the brass weight,but I cannot find the coil spring. I am not even sure there was a spring in the hole because I didn't see it,but the paperwork says there should be one there. I would think the spring should be steel,so the magnet should pick it up,but I have had zero luck. The paperwork says that the parts are all associated with "Pump Disc.". I wonder if the spring not being there would even make a difference,because I swear it wasn't in there. Any idea where I may be able to find this spring elsewhere? Anyone with old Datsun Hitachi carbs kicking around? Any help would be appreciated.

Chris

Check out the ratsun forum, they may be able to help:

http://forum.ratsun.net

The members are mostly from the west coast, but there is a member named fisch(?) from Carver, MA that might be able to point you in the right direction locally.

http://www.311s.org/

http://datsun1200.com/modules/news/

Thanks guys,

I am on Ratsun,and I have a post out,but thought I would ask you guys as well. Fisch is indeed from MA,but not my town. If he were in my town I would know about him I am sure of it. He is in the western part of MA. Hopefully I can find out if the spring is even needed,and if so where I can get one. I found a few carbs for the car ,and from a 200sx on car-part.com,but I don't know if I want to spend $50 for a carb to get just a small spring. Although maybe it would be good to have a spare carb hanging around like I do many times over fro my RX-7.

Is the secondary hard to open on yours? I've got the carb off mine right now, and the secondary does not want to move at all, even with the vacuum diaphragm unhooked. No wonder the damn thing had no power.

My secondaries open just fine manually by hand,but I have no idea if they worked via the vacuum because I never checked it out. The car ran pretty good,and the carb is really clean,but I think it could run better,and I wanted to rebuild the carb. Did you have a hard time getting the carb off? I sure did,mand are those 4 nuts buried under a bunch of things.

I thought the Mazda RX-7 4-barrel was a tough carb to get off,but this one puts it to shame even with a bent distributor wrench.

I almost didn't think it was possible to pull the carb by itself. The mounting nuts are buried in there. I pulled the intake and exhaust manifolds off mine. All those little vacuum lines on the smog stuff were shot. I don't have emissions testing here, so I decided to get rid of everything, and there was no way in hell I could cap off those AIR tubes with the manifolds on the car.