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By 55vickey - 13 Years Ago
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How easy should the vaccuum advance plate move on a 57 & up dizzy if you suck on the hose to it. Mine barely moves and I seem to remember it moving much easier. Thanx, Gary
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By Moz - 13 Years Ago
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you should be able to get it to full advance sucking on the hose easily sounds like the breaker plate needs a little lubrication
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By oldcarmark - 13 Years Ago
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The later ones use nylon pads instead of the old style steel rollers.Possibly the pads are worn allowing the plate to tilt and hangup.Depends on how much use the distributor has seen.Or it ould just need a little lube as Moz indicated.
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By GREENBIRD56 - 13 Years Ago
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Just be pretty sparing with the lubricant when shining it up - goo in there is not good. For a grease type lubricant that doesn't spread out - the Motorcraft silicone caliper grease is high temp and stays put. Is the vacuum can one of the "newer" type (with the adjustment screw down in the vacuum port) - or the older variety one with the hex nose nut for the entry of the vacuum fitting? A little WD40 or other rust blaster will help free up any sticky stuff on the vacuum side of the diaphragm.
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By aussiebill - 13 Years Ago
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55vickey (7/21/2012)
How easy should the vaccuum advance plate move on a 57 & up dizzy if you suck on the hose to it. Mine barely moves and I seem to remember it moving much easier. Thanx, GaryTo make sure diaphram is not leaking thus not pulling plate around, suck hard watching plate and put tongue over hose to hold pressure, if it goes back, its leaking, or disconnect arm and check plate movement by hand.
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By 55vickey - 13 Years Ago
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Ok, thanx for all the suggestions, I tried it off of the dizzy and it still pulled hard, I'd think it wouldn't work at all with a hole in the diaphram...mine is the offset arm, non-adjustable....WD40....how?? Gary
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By oldcarmark - 13 Years Ago
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Just because it does not look adjustable it may still have the allen key type adjustment through the vacuum opening.It may be turned all the way clockwise which makes the tension very tight on the spring inside preventing it from moving easily.WD 40 squirted through the vacuum opening will make it easier to turn the adjuster inside.
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By GREENBIRD56 - 13 Years Ago
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This is the style with the 3/32 hex key adjuster - goes in through the vacuum port. Same spot you would squirt something in to free the mechanism a bit. 
Take care with the adjuster - if the hex key fits but the screw is frozen - it is easily stripped.
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By oldcarmark - 13 Years Ago
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Suggest squirt some wd-40 a couple of times and leave it for 24 hours.Not worth rushing and stripping the screw.
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By 55vickey - 13 Years Ago
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Did the WD40 last night, this morning the allen screw turned very easy, both directions, am I suppose to feel something with this, does it get tightened somehow? Gary
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By oldcarmark - 13 Years Ago
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When you turn it clockwise you are compressing a spring.You should feel resistance as the spring compresses.If you turn it CC it releases tension and the advance should move with little resistace when vacuum is applied.
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By GREENBIRD56 - 13 Years Ago
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Mark - I think you have this backwards - take a screw in your fingers - with nut engaged and turn the screw clockwise. It should move the nut toward you - and inside the housing of the vacuum chamber, the nut that preloads the spring will be backing up toward the nipple as the screw turns clockwise. The instructions that come with the (adjustable) chambers usually tell you to turn the screw clockwise on your old chamber and count the turns until the nut seats at the nipple end. Then you take the 'new" chamber and preload the spring the same number of turns counter-clockwise - as a calibration. You check the calibration by operating the engine at idle (high vacuum) and deliberately watching the advance you get by turning it "on and off" with a hose attached to manifold vacuum.
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By oldcarmark - 13 Years Ago
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You are correct Steve! In Canada its backwards just like Australia where its upside-down! LOL!
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By Moz - 13 Years Ago
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actually over here being upside down makes it way harder to adjust everything every time i try to do my valve lash the feeler gauge falls up into the sky
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By oldcarmark - 13 Years Ago
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Well Moz at least you dont have to worry about dropping small parts into the motor when you are working on it.Just catch them before they disappear skyward.
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By Moz - 13 Years Ago
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your right mark it also makes it easier to change the camshaft you dont need clothes pegs for the lifters hahaha
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