Holley doesn't look right

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Dec 21, 2016 | 01:47 PM

POPAJON

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Fleet Mechanic

Joined: Aug 2010

Posts: 1,574

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From: Cranbrook, Ont., Canada

Holley doesn't look right

Ok I have a 600 cfm Holley that I have replaced the vacuume diaphragm in. Something is telling me it isn't right. It looks like it is pulled down into the bowel like the old one was. The stems are the same length. Am I doing something wrong here.

It was just a simple replacement.

Dec 21, 2016 | 04:10 PM

Filthy Beast

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Joined: Mar 2011

Posts: 2,698

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From: Taxachusetts

The vacuum secondary diaphragm when installed correctly should look like a blown up inner tube, facing up as you hold it, and facing the spring and spring cover.

Dec 21, 2016 | 08:38 PM

jakeharp

Fleet Mechanic

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From: Nevada

Dec 21, 2016 | 09:49 PM

DB429SCJ

Laughing Gas

Joined: Apr 2016

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From: Buffalo NY

http://documents.holley.com/199r7948-5rev6.pdf Page 14 has good pics.

Dec 22, 2016 | 11:42 AM

POPAJON

Thread Starter

Fleet Mechanic

Joined: Aug 2010

Posts: 1,574

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From: Cranbrook, Ont., Canada

Yup when I install the rubber diaphragm into the housing it looks like that. Put it all back together and hook the rod up to the secondary throttle plate and it gets pulled down into the housing and the secondaries are still closed . I am starting to think that the rod is too short.

Dec 22, 2016 | 12:25 PM

DB429SCJ

Laughing Gas

Joined: Apr 2016

Posts: 858

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From: Buffalo NY

Once you tighten the cover screws and release the rod, the diaphragm will be pushed down by the spring. Do the secondaries open as they should? If they do ,you got it right.