440 Dist. drive gear question

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Kendog 170

Let the boy go !
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So I've noticed considerable play turning my rotor back and forth on my 440/500 motor . I pulled the Dizzy and drive gear and it seems the slot on gear is wider than the end of the dizzy . I found a similar thread where someone had the same issue but he never finished the thread. I don't want to resurect it as it is a real old thread . My timing jumps up and down about 4 degrees consistently. I have yet to check for slack in the chain yet but thought I would ask if it has happened to someone here.
Thanks
 
The rotor will turn in the c/w direction but should not in the other. Points or electronic ignition?
 
Yup the rotor will turn about 10-15 degrees clockwise like Ray said. It will do it with the distributor OUT because that's the mechanical advance mechanism. Maybe the advance springs are too light?
 
I am thinking bad ground if it is points or a broken spring, also the MP spring kit will do that also, super light.. What distributor is it.
 
I am thinking bad ground if it is points or a broken spring, also the MP spring kit will do that also, super light.. What distributor is it.

It sure will if you use both the lightest sprAngs. I always use the lightest one and the next strongest.
 
I is a reman. stock electronic that I took the heavy spring out and put a Mr. Gasket light spring in. Also a limiter plate. When I say play back and forth it's while installed.
I'll have to check clockwise only. Springs are intact.
 
Might be the light spring if the drive gear is ok, The lighter spring in a distributor is for the lower RPM then the heavy spring with the loop takes over for high rpm. Usually when the slot is worn when it rotates it USUALLY keeps the dist shaft locked against it if that makes sense. No real resistance in the distributor to make it say walk backwards. Hope it helps.
 
Yes understood. Rotating force keeps it locked. So probably normal. Car runs good .
Thanks
 
Prob the light spring bouncing, also check the gap of the pickup is the same all around the reluctor.
 
The definitive test is an "old school" timing light and wind it up a bit and see what you have for spark stability.
 
Prob the light spring bouncing, also check the gap of the pickup is the same all around the reluctor.

I actually thot about making a stainless steel U shaped shim for it , but decided not to , if I needed to pull the dist , would probly drop down in the engine .
 
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