EricB Posted March 1, 2003 Share #1 Posted March 1, 2003 Morning everybody, Have you noticed that if you don't know what something is called you are faced with leafing through hundreds of pages of service manual in hops of finding a drawing of the part you want to know more about.... I need some help as I'm unsure what these items are. I am looking to doing some cleanup in the engine bay and moving things around - thus the question.... the top is a vent which connects the block with ??? I don't think it's ever been correctly connected - I know i am getting fumes from it but otherwise is it hampering anything else?? the middle is on the firewall between what once was my heater hoses and the stock battery location. what's it called, what's it for? the bottom is the voltage regulator I think - is that right? What purpose does the small cylindrical resistor grounded next to it serve? Thanks and sorry for the (dumb?) questions... -e Link to comment Share on other sites More sharing options...
Ed Posted March 1, 2003 Share #2 Posted March 1, 2003 The first one i believe is part of the venting system to the fuel tank. The vapors from the tank and the engine get circulated back into the air intake. The exposed nipple on the top goes to the air box (which it doesn't look like you have).The second picture I'm wondering myself.And the third is your voltage regulator. Wish I could help more. I'm sure someone here knows.:classic: Link to comment Share on other sites More sharing options...
EScanlon Posted March 1, 2003 Share #3 Posted March 1, 2003 1) Fuel Return Valve; returns the extra fuel that has gone through the fuel line and the carburators to the fuel tank. This necks down the return so that there is pressure in the line to the carburators and also so that the line doesn't drain into the fuel tank when the car is shut off.2)Seat Belt Warning System Relay, if I recall right. Not present in early Z's but past 72 is part of the system for the seat, choke and key warning system.3) Voltage Regulator.I'm going strictly off memory, so 2ManyZ or some of the other Engine Bay Critters may shoot me down in flames....Enrique Link to comment Share on other sites More sharing options...
thefastestz Posted March 1, 2003 Share #4 Posted March 1, 2003 The first pic, In the hanes manual they call it a flow guide valve.There is a picture of it on pg. 66. (fig. 3.74)one hose comes from the fuel tank, and then there are two hoses that face the engine. One of those hoses goes to the crankcase and the other to the air cleaner.It is part of an evaporative emission control system. It says that when the engin e is not operating, the fuel tank evaporation makes a vapor pressure. When the vapor pressure gets to a certain point it passes the vapors into the crankcase.When the engine is started the vapors pass into the combustion chamber and are ignited.When there is low fuel there can be a vacuum in the system. When there is the flow guide valve will open and draw air from the air cleaner.I think the middle pic is the transistor ingnition unit. There is a diagram on pg.74 of the hanes manual showing what it connects to. (fig.4.2) also there is a diagram on pg. 79 (fig. 4.22) showing its location on the fire wall.the last picture is your voltage regulator. A pic of it in the hanes manual is on page 149. and there is a diagram on the same page in Fig,10.14.There is also other info on that same page. It hooks up to your wiring harness. Link to comment Share on other sites More sharing options...
Bambikiller240 Posted March 1, 2003 Share #5 Posted March 1, 2003 Originally posted by EricB Morning everybody, Have you noticed that if you don't know what something is called you are faced with leafing through hundreds of pages of service manual in hops of finding a drawing of the part you want to know more about.... I need some help as I'm unsure what these items are. I am looking to doing some cleanup in the engine bay and moving things around - thus the question.... the top is a vent which connects the block with ??? I don't think it's ever been correctly connected - I know i am getting fumes from it but otherwise is it hampering anything else?? the middle is on the firewall between what once was my heater hoses and the stock battery location. what's it called, what's it for? the bottom is the voltage regulator I think - is that right? What purpose does the small cylindrical resistor grounded next to it serve? Thanks and sorry for the (dumb?) questions... -e Top picture is of the Flow Guide Valve. It routes vapors from the fuel system to either the air cleaner assembly or to the crankcase depending on whether or not the engine is running. Second is..............I don't know. Some kind of relay, not sure what. You must have a 73 240? Third is the Voltage regulator. (240Z's and 260Z's did not come with an internally regulated altenator) Tttthats all folks! Carl Link to comment Share on other sites More sharing options...
EricB Posted March 2, 2003 Author Share #6 Posted March 2, 2003 First, yes my 240 is indeed a '73.Now, along the lines of what Carl said in the above reply, when I picked up my '81 F54 (only 75K miles!) from the local junkyard I also grabbed its nearly new alternator. When I do the swap to L28 power how do I need to modify my wiring to take the newer alternator (do I just unplug the voltage regulator? I doubt it is that simple) - or would it be simpler to just keep using my L24 alternator with the new engine?About the fuel vapor connecting to the crankcase item, other than having to deall with more second hand vapors what's the matter with removing it altogether? I can't connect its top portion up to an airbox as I've got Weber triples...Thanks again!-e Link to comment Share on other sites More sharing options...
Bambikiller240 Posted March 2, 2003 Share #7 Posted March 2, 2003 Originally posted by EricB nearly new alternator. When I do the swap to L28 power how do I need to modify my wiring to take the newer alternator (do I just unplug the voltage regulator? I doubt it is that simple) - or would it be simpler to just keep using my L24 alternator with the new engine? It is not as simple as pulling the regulator and installing the later altenator, but as I understand it, it's not that difficult to do the required mod. I believe that it involves making a jumper wire from one pin on the voltage reg connector of the wiring harness to another pin on that connector. (may need to do this for more than one set of pins) and intalling a diode in a specific location there as well. I do not know the exact pin locations for these mods, but you can probably find out by doing a search here or check the www.zhome.com website under "Index of Technical Articles", then "A 280Z Alternator For Your 240Z. " Many people do this when they want to increase the amperage of their electrical system.Good Luck!Carl Link to comment Share on other sites More sharing options...
2ManyZs Posted March 2, 2003 Share #8 Posted March 2, 2003 They have the first and third one pegged, but the second one has me stumped. It's not a transistor ignition unit since it's not a FI car, and I'm not sure about this, but the 73's didn't have the seatbelt interlock. That came out either late 74 or not until the 75's if I remember correctly. Did the car have A/C by chance? Where did you ever find that battery hold down?:devious: :cross-eye Link to comment Share on other sites More sharing options...
EricB Posted March 2, 2003 Author Share #9 Posted March 2, 2003 yes the battery hold down is a classy one isn't it... hahha... thanks carl for the link i'll do the digging. and keith, no the car never had AC to my knowledge... i am looking for an exact match (wire color-wise) for it in the wiring diagram of the nissan '73 240z service manual - i'll let you know what it is.... BTW i found no mention of a seatbelt warning system relay in the above mentionned nissan service manual.... -e Link to comment Share on other sites More sharing options...
beandip Posted March 5, 2003 Share #10 Posted March 5, 2003 My '73 has a seat interlock as well as seat belt. At least I think it does. I have wireing connected to both the seat bottoms and the belt retracters. If I remember Scanlon said that's what they were. Isn't there a way of introducing a vac line into the clean air side of the air fiter ? All the line does is allow clean air to enter so that the fumes can go to the crankcase. At least that is how I remember the diagram. Iwas having a problem with fumes awhile back and found that I was building pressure in the fuel tank and the smell was horrable inside the car . I cleared the lines and it seems to have taken care of the problem , so far . Will see this summer. :classic: Link to comment Share on other sites More sharing options...
Daniel Posted March 5, 2003 Share #11 Posted March 5, 2003 Part #2 is the horn relay on a 73. Link to comment Share on other sites More sharing options...
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