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08-25-2017, 10:59 PM
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#1 |
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Registered User
 
Join Date: Dec 2012
Location: North Carolina
Posts: 4,989
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Distributor is moving out of its zone
Alright
When I drive the truck multiple times the timing moves and starts to choke down? I am so confused on this as I have tried to think of some things that could cause this anyone have a clue?
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1971 GMC Sierra 1959 GMC 100 |
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08-25-2017, 11:36 PM
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#2 |
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Post Whore
 
Join Date: May 2015
Location: Alabama
Posts: 14,583
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Re: Distributor is moving out of its zone
the distibutor itself is moving or just the timing is getting off?
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08-26-2017, 07:15 AM
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#3 |
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Registered User
Join Date: Feb 2009
Location: Glendale, Az
Posts: 1,062
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Re: Distributor is moving out of its zone
what engine and dist?
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08-26-2017, 07:18 AM
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#4 |
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Registered User
Join Date: Dec 2012
Location: North Carolina
Posts: 4,989
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Re: Distributor is moving out of its zone
270 engine.. The timing is getting off or both. Im not really sure but when
I turn the distributor back to where it needs to be the truck runs fine
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1971 GMC Sierra 1959 GMC 100 Last edited by SCHRUMGMC; 08-26-2017 at 07:26 AM. |
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08-26-2017, 08:06 AM
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#5 |
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Post Whore
Join Date: May 2015
Location: Alabama
Posts: 14,583
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Re: Distributor is moving out of its zone
is the hold down clamp tight? if you have to keep turning the dist back to the same position each time it sounds like the clamp isn't holding
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08-26-2017, 11:34 AM
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#6 |
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Registered User
Join Date: Sep 2009
Location: Monroe,Iowa
Posts: 4,370
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Re: Distributor is moving out of its zone
Must have that Famous Optional Floating Distributor
 Bet your Hold down is Shot
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08-26-2017, 12:08 PM
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#7 | |
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Hollister Road Co.
Join Date: Apr 2005
Location: Houston
Posts: 6,134
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Re: Distributor is moving out of its zone
Quote:
The second clamp is for the fine tuning, The flat one with the degree notches. This is called an Octane selector. Its sole function is to advance or retard the timing a few degrees according to the octane of the gas you were running. Main timing is done by the collar clamp mentioned above. Frist set the octane selector to the center line matched to the line on the block. tighten that screw. Loosen the screw on the collar and set the timing pointer to the ball on the flywheel and clamp the collar tight. If its loose the dist. will rotate on its own and get out of time. The screw is sometimes hidden behind the grease cup on the side of the dist. If it pings a little or you want a little more power you adjust the octane selector in what ever direction you need. |
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08-26-2017, 03:50 PM
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#8 |
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Registered User
Join Date: Dec 2012
Location: North Carolina
Posts: 4,989
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Re: Distributor is moving out of its zone
The distributor is supposed to move a little due to the Vacuum Advance but I don't have a hold down clamp and never have.
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1971 GMC Sierra 1959 GMC 100 |
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08-26-2017, 07:56 PM
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#9 |
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Hollister Road Co.
Join Date: Apr 2005
Location: Houston
Posts: 6,134
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Re: Distributor is moving out of its zone
You should have all this, if not your missing parts
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08-26-2017, 09:29 PM
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#10 |
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Registered User
Join Date: Dec 2012
Location: North Carolina
Posts: 4,989
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Re: Distributor is moving out of its zone
I just looked and I have all of that except for the spring or whatever that is
right there on the Vacuum advance
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1971 GMC Sierra 1959 GMC 100 |
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08-26-2017, 11:32 PM
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#11 |
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Hollister Road Co.
Join Date: Apr 2005
Location: Houston
Posts: 6,134
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Re: Distributor is moving out of its zone
Post a picture of what you have it would be easier to tell if its missing something
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08-27-2017, 08:01 AM
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#12 |
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Registered User
Join Date: Dec 2012
Location: North Carolina
Posts: 4,989
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Re: Distributor is moving out of its zone
I will when I get off of work
__________________
1971 GMC Sierra 1959 GMC 100 |
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08-27-2017, 08:44 PM
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#13 |
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Registered User
Join Date: Dec 2012
Location: North Carolina
Posts: 4,989
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Re: Distributor is moving out of its zone
See, I have everything.. I am thinking the collar thing must be loose?
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1971 GMC Sierra 1959 GMC 100 |
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08-27-2017, 09:30 PM
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#14 |
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Hollister Road Co.
Join Date: Apr 2005
Location: Houston
Posts: 6,134
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Re: Distributor is moving out of its zone
This screw is most likely loose
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08-27-2017, 11:05 PM
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#15 |
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Registered User
Join Date: Dec 2012
Location: North Carolina
Posts: 4,989
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Re: Distributor is moving out of its zone
I've tried tightening it as tight as I could get it
__________________
1971 GMC Sierra 1959 GMC 100 |
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08-27-2017, 11:59 PM
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#16 |
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Hollister Road Co.
Join Date: Apr 2005
Location: Houston
Posts: 6,134
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Re: Distributor is moving out of its zone
can you turn it by hand with it tight? the only other part that could cause this is the pin that holds the gear on the shaft has sheared.
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08-28-2017, 01:09 AM
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#17 |
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Registered User
Join Date: Dec 2012
Location: North Carolina
Posts: 4,989
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Re: Distributor is moving out of its zone
Do they reproduce these Distributors?
__________________
1971 GMC Sierra 1959 GMC 100 |
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08-28-2017, 09:51 PM
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#18 |
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Hollister Road Co.
Join Date: Apr 2005
Location: Houston
Posts: 6,134
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Re: Distributor is moving out of its zone
You can get a rebuilt for rockauto but It may just be a $0.50 roll pin that needs replacing.
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08-30-2017, 12:30 AM
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#19 |
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Registered User
Join Date: Dec 2012
Location: North Carolina
Posts: 4,989
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Re: Distributor is moving out of its zone
Thank you
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1971 GMC Sierra 1959 GMC 100 |
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