Rockatansky620 Posted October 25, 2011 Report Share Posted October 25, 2011 I found a rebuilt carb on eBay, and it says its a Hitachi for a 510 but strikes an uncanny resemblance to the factory Hitachi carb on my 620. A re these interchangeable? http://www.ebay.com/itm/130590111478?item=130590111478&viewitem=&vxp=mtr#ht_3618wt_1185 Looks like a rocking price and the seller has great feedback. This would save me the time of learning the innerworkings of a cab and let me rebuild my current one in my own time. Quote Link to comment
datzenmike Posted October 26, 2011 Report Share Posted October 26, 2011 They are all roughly similar looking, yes. The first electric chokes were on the '72 model but made June '71 so the description is sort of right. The one shown is consistent with the '72 L16 carb. This one would not fit the 620 exactly because of the different throttle linkage. It would also be jetted for a smaller L16. Quote Link to comment
DanielC Posted October 26, 2011 Report Share Posted October 26, 2011 A 510 has a linkage that rotates, that goes to the firewall, I believe. If the 620 os like a 521, the 620 is cable operated. Quote Link to comment
datsunaholic Posted October 26, 2011 Report Share Posted October 26, 2011 His 620 is a '73, which also used a L16 so the jetting wouldn't be that far off if at all. They're the same model carb, with a minor smog setup change and different linkage (that is easily swapped over). Quote Link to comment
datzenmike Posted October 26, 2011 Report Share Posted October 26, 2011 Somewhere in my head was 'L20B' but yeah that's a good deal. Quote Link to comment
Rockatansky620 Posted October 26, 2011 Author Report Share Posted October 26, 2011 Win! I'll drop a bid and see how it goes! Quote Link to comment
racerx Posted October 27, 2011 Report Share Posted October 27, 2011 That's a good price.... Quote Link to comment
Rockatansky620 Posted November 7, 2011 Author Report Share Posted November 7, 2011 Ok, got the carb in the mail, and from what I can tell, a simple linkage swap will make this carb useable. EXCEPT, for this missing sensor on the new carb. Here are some oics of the two: Hers the sensor with a single wire coming off of it: Another shot: And where it would be on the new beautiful carb: Any idea what this sensor is? And how important it is? I'm not thinking very much considering this is a 1973 pickup. Quote Link to comment
datsunaholic Posted November 7, 2011 Report Share Posted November 7, 2011 It's not a sensor. It's the idle cutoff solenoid (AKA the anti-dieseling solenoid). The AD solenoid wasn't used until '73. Quote Link to comment
anthonydeb Posted November 26, 2011 Report Share Posted November 26, 2011 It's not a sensor. It's the idle cutoff solenoid (AKA the anti-dieseling solenoid). The AD solenoid wasn't used until '73. what exactly dose the idle cutoff solenoid do? Quote Link to comment
Dguy210 Posted November 26, 2011 Report Share Posted November 26, 2011 what exactly dose the idle cutoff solenoid do? Prevents the car from continuing to run when you turn off the key (e.g. dieseling). Quote Link to comment
datzenmike Posted November 26, 2011 Report Share Posted November 26, 2011 All fuel going to the idle circuit has to get past the idle cut solenoid. It's an electrically operated valve that is held open when the ignition is in the ON position allowing fuel to the idle mixture screw. Many motors have a tendency to 'diesel' or 'run on' when the key is turned off. This is caused by many things such as crappy lead free gas (that does not prevent pre ignition as well) and higher engine running temperatures. When the ignition is shut off there is enough heat and compression (and idle mixture) for the cylinder if self ignite. An idle cut solenoid stops the flow of fuel to the idle circuit when the key is turned off and quickly stalls the motor. Quote Link to comment
anthonydeb Posted November 27, 2011 Report Share Posted November 27, 2011 ok yes iv noticed that on my carb that wire just gose nowere... im also having trouble with it idleing without using the choke well geting it to run all all the time without the choke Quote Link to comment
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