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Author Topic: Vacuum advance unit change.  (Read 1193 times)

Offline fiddler

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Vacuum advance unit change.
« on: July 09, 2020, 09:58:50 PM »
So my truck went suddenly sluggish.  I checked the timing and when I gunned the engine I did not get as much of an advance as I remember seeing so I checked the vacuum advance and when I plugged the line to the carb the engine smoothed...Oh oh.  So I put my vacuum pump on the vacuum advance and I can't pull any vacuum.  The diaphragm unit needs replacing.  Is it possible to change that while the distributor is still in the truck or do I have to pull the distributor?  Have any of you done that?   Thanks for any inputs.

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Ricky

Offline fiddler

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Re: Vacuum advance unit change.
« Reply #1 on: July 09, 2020, 10:00:49 PM »
Sorry,  I forgot to post the truck specs.  1974 chevy C10 stepside.  350 engine with automatic transmission and factory air....  And yes the air works.   
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Ricky

Offline bd

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Re: Vacuum advance unit change.
« Reply #2 on: July 09, 2020, 11:18:23 PM »
The vacuum advance diaphragm can be replaced with the distributor in the engine and clamped down tight.  Two screws.
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Rich
It's difficult to know just how much you don't know until you know it.
In other words... if people learn by making mistakes, by now I should know just about everything!!!
87 R10 Silverado Fleetside 355 MPFI 700R4 3.42 Locker (aka Rusty, aka Mater)

Offline fiddler

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Re: Vacuum advance unit change.
« Reply #3 on: July 10, 2020, 01:27:24 AM »
Tomorrow then.  Thanks much...
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Ricky
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