| Re: [GMCnet] JC-4 Vacuum Pump?? [message #323893 is a reply to message #323880] |
Fri, 15 September 2017 00:32   |
johnd01
Messages: 354
Registered: July 2017
Location: Sacrameot
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Just for comparison what is nominal engine vacuum in a braking situation?
On Thu, Sep 14, 2017 at 3:55 PM, Ken Henderson
wrote:
> Pete Pappas, past SunShine Statesman & Dixielander, devised a way to
> increase the cutoff pressure of the JC4. He sent me details at one time.
> Unfortunately I can neither remember nor find the details. I do recall that
> it involved adding something like a ballpoint pen spring and a small
> machine screw. I never did it because I figured I'd prefer to bypass the
> internal switch and add an external one -- which I never did because the
> Azure pumps came along first.
>
> Searching for that mod, I came across the link to Gene's brake postings.
> Here it is for the enlightenment of newbies:
>
> http://gmcmotorhome.info/addens.html
>
> Ken H.
>
>
> On Thu, Sep 14, 2017 at 5:30 PM, larry.whisler
> wrote:
>
>> ...
>>
>> Someone was looking into altering the internal switch to achieve a higher
>> vacuum. I have no doubt that the JC4 pump could provide an adequate
>> amount \
>> of vacuum if the switch could be overridden.
>>
> ...
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*John Phillips*
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Johnd01
John Phillips
Avion A2600 TZE064V101164
Rancho Cordova, CA (Sacramento)
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