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You can test the vac. advance by removing the rubber hose from carb and sucking on it.
If bad it won't holed any vacuum once you suck all the air out of it. You can also watch the points move while doing it. Sometimes the dizzy points plate will **** that affects the points opening gap.
Also check dizzy ground wire is good and not broken.
Orich
Now how do I word this.... Ah hell, just yank it out and suck on it. Hahaha. If you get air coming through it then it's shot, and you have found your vacuum leak. If you can't suck air through it, it's ok.
Also, make sure you are Hooking it up to ported/timed vacuum and not full manifold vacuum.
Oh crap! my bad
I was in the middle of reading a post on the accelerator diaphragm when I read Rasputin's suggestion for advance diaphragm. got it now
So I took the vacuum advance off, thing on distributor (busted a screw) and sucked it good and seems fine, in my opinion...no expert.Maybe I'll just order a new one anyway.
Removed the points plate and the 1 below it and everything looks in order, even the 3 little bushings look brand new. worn even and sit about 1/8" above the plate. shaft seems nice and snug with no play. weights and springs at bottom are free and clean. Sorry for lack of parts name in the dizzy(witch I'm guessing is the distributor)
Should I lube anything before I put it back in?
All this talk above... maybe I'm at the wrong site lol
Well its back to normal!Took the dizzy apart and cleaned thoroughly, lubed moving parts and reset the points, put it all back where it came from.
Then I check top dead center and found the mark on the fly wheel out by 45deg, so the timing that was set from the garage was way out. I have another truck ,same engine and checked the location of the dizzy and matched to troubled truck and it works perfectly. I'll have to find the actual mark or make one at tdc and fine tune it tomorrow.
I have never had to adjust the timing on that truck since I bought it in the 80's. The mark on the flywheel I have no idea where or how it got there but now i know its out now. How it got out of time is beyond me...I know I haven't touched it. Like I said I had just gotten off the hwy when this all started?
Well its back to normal!Took the dizzy apart and cleaned thoroughly, lubed moving parts and reset the points, put it all back where it came from.
Then I check top dead center and found the mark on the fly wheel out by 45deg, so the timing that was set from the garage was way out. I have another truck ,same engine and checked the location of the dizzy and matched to troubled truck and it works perfectly. I'll have to find the actual mark or make one at tdc and fine tune it tomorrow.
I have never had to adjust the timing on that truck since I bought it in the 80's. The mark on the flywheel I have no idea where or how it got there but now i know its out now. How it got out of time is beyond me...I know I haven't touched it. Like I said I had just gotten off the hwy when this all started?
Congrats!!!!!! Most of the time with the pre-computer engines the fixes are usually pretty basic...just takes some time to figure out what the engine is trying to tell ya