Carb issue

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Carb issue

Post  jpierce55 on Mon Aug 21, 2017 5:19 pm

My secondaries are sticking when no return spring is attached. It's a slight hang up. I tried removing the butterflies and took sandpaper to the edges and lightly to the base. I haven't pulled the shaft out. Never had this issue before. Should I try replacing the shaft, or just get a new baseplate? I'm not sure how much effort goes into lining up the butterflies exactly correct again?

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Re: Carb issue

Post  norm on Mon Aug 21, 2017 5:50 pm

Sure it's not hanging up on the pump cam?
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Re: Carb issue

Post  supervel45 on Mon Aug 21, 2017 7:50 pm

You never want the secondaries fully closed on the seat. There is a slotted screw on the bottom side of the base plate that makes contact with the accelerator pump cam retaining bracket arm on Double Pumpers and the Vacuum Pod shaft rod attachment bracket on Vacuum Secondary models. It is Locktited from Holley. If it has been adjusted much before and not re-Loctited it can potentially un screw and loose it's setting. If the screw is missing replace it. You can hold the base plate up to the light and center the blades for the least gap or evenness. Pay attention that both transfer slots are coming out as evenly covered as possible. Do not center the throttle blades with the previously discussed bracket attached to the throttle shaft unless the stop screw is removed or backed off of the contact point fully.

PS: This is ASSUMING it's a conventional Holley Four Barrel.

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Re: Carb issue

Post  supervel45 on Mon Aug 21, 2017 8:15 pm

Make Model and List Number would help greatly on this deal. The Old Holley Competition Roller Linkage and others have different Hiccups.

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Re: Carb issue

Post  supervel45 on Mon Aug 21, 2017 8:38 pm

jpierce55 wrote:My secondaries are sticking when no return spring is attached. It's a slight hang up. I tried removing the butterflies and took sandpaper to the edges and lightly to the base. I haven't pulled the shaft out. Never had this issue before. Should I try replacing the shaft, or just get a new baseplate? I'm not sure how much effort goes into lining up the butterflies exactly correct again?

Had a almost brand new Holley DP doing almost the same thing you describe. It turned out one of the rear throttle plates was not likely tightened properly from the factory and it could move around and stick at random. It was kind of hard to catch at first as I was not expecting loose throttle blade screws on almost new carburetor.

I would check for the same deal also on all eight screws to be safe and it should always be a firm rule if you take a base plate off. It's a major vehicle safety concern about like loose lug nuts not to mention potential engine damage.




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Re: Carb issue

Post  jpierce55 on Tue Aug 22, 2017 12:28 pm

It's the coil spring on the shaft of the secondaries.

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Re: Carb issue

Post  supervel45 on Tue Aug 22, 2017 3:07 pm

jpierce55 wrote:It's the coil spring on the shaft of the secondaries.

Did it break or just come out of one of it's attachment points?

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Re: Carb issue

Post  jpierce55 on Thu Aug 24, 2017 4:51 pm

It was pulling loose, it was slightly unraveled and a pulled thecwindings tighter

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