Ignition? (2 Viewers)

[Tigger72]

Ok here's a question for those of you who know the internal workings of the vacuum retard dizzy... is there a chance the vacuum retard plate could be moving around when running? Maybe diaphram went bad? Maybe tossed something loose in an adjustment or in the washboard. Just a thought.

 

[CruiserInProgress]

Ok here's a question for those of you who know the internal workings of the vacuum retard dizzy... is there a chance the vacuum retard plate could be moving around when running? Maybe diaphram went bad? Maybe tossed something loose in an adjustment or in the washboard. Just a thought.

I'm not familiar with the earlier Toyota vacuum retard distributors, but there is a common problem that can develop with age on the centrifugal advance mechanism, that I noticed on my 79 OEM small cap distributor and the big cap OEM that I upgraded to. This tip came from another member post here (JimC?).

If you locate the arrow in my 79 distributor, it points to the centrifugal advance stop pin. That pin affects the range of centrifugal advance, both min and max.

From the Toyota factory, that pin comes with a plastic bushing on it, limiting the range. Over time, that plastic bushing becomes brittle and eventually falls into pieces at the bottom of the distributor.

The fix for mine involved finding a suitable aluminum bushing (spacer) at home depot (for #8 or M4 pin, 1/4" OD).

You might have look under your breaker plate to see if this problem may apply to your distributor. Just a thought.

 

[charliemeyer007]

As engine rpm's go up so must the advance, vacuum declines so either your vacuum advance/retard must do the right thing or your rig doesn't run correctly. No plastic guts in my real Delco or the china unit.