| [GMCnet] Fwd: Emission Control System Check Valve [message #258525] |
Mon, 11 August 2014 18:27 |
emerystora
Messages: 4442
Registered: January 2004
Karma: 13
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Senior Member |
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Begin forwarded message:
> From: Emery Stora
> Subject: Re: Emission Control System Check Valve
> Date: August 11, 2014 5:26:52 PM MDT
> To: Peter
>
> OK. Now I understand. It is in the vacuum circuit for the TVS system (Distributor Thermal Vacuum Switch) and is only found on 1977 or 1978 GMC motorhomes with a 403 engine with some slight mods for the California model.
>
> I found it in the GMC Motorhome Maintenance Manual X7725 Section T.
>
> What I didn't know was that it was for the control of the distributor. That is what I questioned you for. There are a lot of vacuum controlled things on the GMC motorhome.
>
> I think what you want is a GM 497853
>
> Do a search on Goggle for GM497853
>
> I found one on eBay $9.95 shipping free
>
> $5.00 here http://www.buickfarm.net/index.php?option=com_redshop&view=product&pid=3003&cid=6&Itemid=126
> Don't know what shipping costs are though.
>
> I think that a cross is a Wells E9031.
>
> Hope this helps.
>
> Emery Stora
> 77 Kingsley
> Frederick, CO
>
>
> On Aug 11, 2014, at 4:32 PM, Peter wrote:
>
>> Emery,
>>
>> If you look at the Emission Control System for 1978 GMC’s you will see a vacuum line going from Vacuum Control Valve to the Carburetor “G” . This is the check valve I am looking for.
>>
>> Regards
>> Peter D. Huber
>> GMC Royale 1978 403
>>
>> From: Emery Stora [mailto:emerystora@mac.com]
>> Sent: Monday, August 11, 2014 3:13 PM
>> To: Peter
>> Subject: Re: Emission Control System Check Valve
>>
>>
>> I must be getting dense. I still don't know what it controls. Is this the vacuum line that goes to the vacuum modulator on the passenger right side of the transmission that controls the shifts?
>>
>> Emery Stora
>> On Aug 11, 2014, at 3:37 PM, Peter wrote:
>>
>>
>> Emery,
>>
>> To clarify regarding your question the check valve is in line of the Vacuum control Valve . I runs on top of the intake manifold to the carburetor. This is the check valve I need.
>> Any help? Thank you.
>> Regards
>>
>> Peter D. Huber
>> GMC Royale 1978 403
>>
>>
>
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