Dats Right Posted April 3, 2014 Report Share Posted April 3, 2014 Hello ratsun, could someone please educate me as to the name and purpose of part mounted on the firewall directly behind the air filter housing, looks like a vacuum, has a hose coming off it., thanks. Quote Link to comment
DanielC Posted April 3, 2014 Report Share Posted April 3, 2014 My first Datsun was a single headlight 520, with the J-13. It did not have that part, as far as I can recall. Quote Link to comment
67_1600 Posted April 3, 2014 Report Share Posted April 3, 2014 Have you followed the hose and/or wires to see where they go? Or are they not connected to anything? Quote Link to comment
Dats Right Posted April 3, 2014 Author Report Share Posted April 3, 2014 The tube connects to a fitting on the manifold directly below it, is that the pcv valve? It is a 69 521 with a j15 thanks Quote Link to comment
ggzilla Posted April 3, 2014 Report Share Posted April 3, 2014 That is a non-Federal part. Not the PCV valve. It might be California emissions. Does the aluminum.plate say J13? Does it have an emissions sticker underside of hood? Quote Link to comment
Dats Right Posted April 3, 2014 Author Report Share Posted April 3, 2014 Thanks i thought it might be somethin like dat, im not sure if it works correctly, is it better to eliminate it and plug off the manifold, or should i make sure the electrical is working and keep it intact, im in massachusetts so no emission inspection is required Quote Link to comment
ggzilla Posted April 3, 2014 Report Share Posted April 3, 2014 We don't know. Is it a J13 vehicle? What about the emssions sticker? Does it have month build date on the drivers door post? If you provide that others will know for sure. Quote Link to comment
Dats Right Posted April 3, 2014 Author Report Share Posted April 3, 2014 its a j15, im runnin out to check that door post now Quote Link to comment
Dats Right Posted April 3, 2014 Author Report Share Posted April 3, 2014 Couldnt find the sticker on hood or any thing on the door post, the aluminum plate says engine capacity 1295 cc, car no. 059096, engine no. j-747002, but on the engine it says j15-482781 Quote Link to comment
Dats Right Posted April 3, 2014 Author Report Share Posted April 3, 2014 Does that tell ya anything, im trying to eliminate any vacuum leaks, and that connection to the manifold seems like a good source, i cant seem to find another image of this part anywhere Quote Link to comment
ggzilla Posted April 4, 2014 Report Share Posted April 4, 2014 Yes, that tells us it is not the original engine. Quote Link to comment
ggzilla Posted April 4, 2014 Report Share Posted April 4, 2014 And that it was made between May 1968 and Feb 1969. Build plates were not required until Aug 1969. The 1969 model year 521 started Sep 1968, so if the state got the reg correct ... Congrats on it having a rare J15 swap. The original J13 was a bit under powered. Quote Link to comment
Dats Right Posted April 4, 2014 Author Report Share Posted April 4, 2014 Thanks for the info ggzilla, i had a hunch this motor was swapped, but hadnt compared those numbers till today, now if i can just figure out what to do with this mystery emissions device Quote Link to comment
wayno Posted April 4, 2014 Report Share Posted April 4, 2014 Just cap the intake manifold outlet and remove the mystery part, that's what I would do. If you can, follow the wires to where they go, do any of them go to the dist? What color are the wires? 1 Quote Link to comment
Dats Right Posted April 4, 2014 Author Report Share Posted April 4, 2014 Thanks, one wire is blue and one black and they connect to the carburetor harness Quote Link to comment
smoke Posted April 6, 2014 Report Share Posted April 6, 2014 I bet it's some sort of vacuum switch. 1 Quote Link to comment
ggzilla Posted April 7, 2014 Report Share Posted April 7, 2014 That's the emissions sticker right there. What does it say? Quote Link to comment
Dats Right Posted April 7, 2014 Author Report Share Posted April 7, 2014 It says something like, FUEL CUT OFF this vehicle is equipped with a fuel cut off to maintain emissions, set rpm to 700, timing to TDC, set idle screw, do regular maintenance on fuel system to maintain emissions, Quote Link to comment
ggzilla Posted April 8, 2014 Report Share Posted April 8, 2014 All right, that's what it is, same as a 68. Unplug the hose from the manifold, plug the port. Quote Link to comment
ggzilla Posted April 8, 2014 Report Share Posted April 8, 2014 When that part is working correctly, it activates the carb's "Fuel-Cut Valve" when decelerating. There is no downside to it unless the vacuum part is leaking. It will deliver more fuel economy. Quote Link to comment
Dats Right Posted April 9, 2014 Author Report Share Posted April 9, 2014 thanks didnt realize the sticker was refering to that part, seems obvious now Quote Link to comment
ggzilla Posted April 9, 2014 Report Share Posted April 9, 2014 This part, the fuel cut switch: Does not go with the the carburetor you have. Your carb has a 3-bolt "Coasting Air" solenoid instead of the original carburetor's screw-in "Fuel Cut" solenoid. Yep, just disconnect the hose from the manifold and plug the manifold port. Quote Link to comment
Dats Right Posted April 9, 2014 Author Report Share Posted April 9, 2014 Ok well that settles it for sure thanks a lot for the follow up 1 Quote Link to comment
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