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Ford 9N, 2N & 8N Discussion Forum
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Re: 641 voltage regulator specs

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Author  [Modern View]

01-23-2013 14:01:14

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Quoting Removed, click Modern View to seeWayne, I see no responses & they may be hard to come by, so I will give you some data that "may" be useful to you, in the absence of good hard data on your specific regulator. Ford cars, trucks, tractors of that general vintage were set to have cut out close at 6.3 volts, + or -0.3 and the regulator section set to regulate to a voltage of 7.3 + or -0.2.

Setting up a VR is not real simple. To do it correctly, one really needs good voltmeters, ammeters, variable loads, , small files & a lot of time/patience. Temperature needs to be cover-on operating temperature as well (this really make things slow!). Typically, the contact gap needs to be set, the armature air gap set, and the spring tension set to obtain desired end results. The only specs that I personally have related to these parameters are that "typical" contact gaps are 0.020, armature air gap on cut outs of these vintage Fords is 0.017, and voltage armature gap 0.035. Having said that, sometimes those armature gaps are set with contacts just closed & occasionally at contacts open by a specific gap. Springs, generally set the voltage at which contacts close and the combination of spring /armature air gap yields contacts opening voltage for the cut out. Reverse current plays a role, but not independently adjustable.
For VR section, springs, generally set the voltage at which contacts open and the combination of spring /armature air gap yields contacts closing voltage for the VR section. Not simple and somewhat of a lost 'art' at this day in time of all-electronic solid state controllers/regulators. Maybe someone will be able to come up with hard specifics for your specific regulator & you will get lucky.

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01-23-2013 19:41:27

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 Re: 641 voltage regulator specs in reply to JMOR, 01-23-2013 14:01:14  
Thanks. These values will serve as a guide. I do not plan to make any radical adjustments. My idiot light seems to blink a lot and the voltage I measure running is a little low, 6.8 to 7.0 fluctuating. I plan to clean the contacts and maybe tweak the voltage reg spring force a little to get the voltage up over 7 to around 7.2.

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01-23-2013 18:32:39

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 Re: 641 voltage regulator specs in reply to JMOR, 01-23-2013 14:01:14  
I think you pretty much covered it. Unless somebody has messed with it before, those gaps should be OK. Clean up the points & adjust the spring tention on the field relay.

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