| |
Click on image for the lowdown. 
====
| | | Forums66 Topics128,057 Posts1,055,815 Members48,426 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: May 2005 Posts: 215 Shop Shark | | Shop Shark Joined: May 2005 Posts: 215 | Hello all, after getting my truck running and driving after the tranny rebuild, I noticed my distributor is really close to the vacuum advance and I cannot rotate it counter clockwise I plan to remove it tomorrow and re orient Also vacuum advance is not moving when reving the truck http://i430.photobucket.com/albums/...28AED863-C027-43AB-8398-C6A226B20DDC.jpg | | | | | Joined: Apr 2005 Posts: 7,440 Bolter | | Bolter Joined: Apr 2005 Posts: 7,440 | Time to trace out your vacuum lines to make sure you are getting vacuum to the advance. If so, it's time for a new Vacuum Advance.
Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne (Emily)
‘39 Dodge Business Coupe (Clarence)
“I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line"! Hug a cop!
USAF 1965-1969 Weather Observation Tech (I got paid to look at the clouds)
| | | | | Joined: Apr 2009 Posts: 554 'Bolter | | 'Bolter Joined: Apr 2009 Posts: 554 | Agree with Justhorsenround. Especially check the carb insulator and base gasket to make sure you haven't covered the vacuum hole.
| | | | | Joined: May 2005 Posts: 215 Shop Shark | | Shop Shark Joined: May 2005 Posts: 215 | Yes I will
But what is the opinion of the distributor hitting the vacuum advance? | | | | | Joined: Apr 2005 Posts: 7,440 Bolter | | Bolter Joined: Apr 2005 Posts: 7,440 | As you suspected the distributor is not clocked right.
Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne (Emily)
‘39 Dodge Business Coupe (Clarence)
“I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line"! Hug a cop!
USAF 1965-1969 Weather Observation Tech (I got paid to look at the clouds)
| | | | | Joined: Dec 2003 Posts: 1,061 'Bolter | | 'Bolter Joined: Dec 2003 Posts: 1,061 | I dealt with this recently too. Bring the engine to the timing ball and pointer alignment for number 1 cylinder. Loosen the bracket holding the distributor in place and carefully pull it up until the gears disengage. turn the distributor clockwise until you can re engage the distributor drive gear. Slide it back in and bump the engine with the starter until the distributor seats in the oil pump. Then re time the engine.
1946 1-ton Panel
1952 1-ton Comml. W/Grain Body
| | | | | Joined: Mar 2010 Posts: 10,274 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,274 | There is absolutely no need to pull the distributor on this engine to gain enough range of movement to properly time it without running into something.
Simply pull the spark plug wires off of the distributor cap and relocate them one distributor tower off of where they currently are. Then you can put the ball on the needle, twist the distributor until the rotor is lined up to the #1 wire. You will then have all kinds of room to advance or retard the timing.
Carl
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
| | | | | Joined: May 2005 Posts: 215 Shop Shark | | Shop Shark Joined: May 2005 Posts: 215 | Thanks guys
I was successful with this today | | | | | Joined: May 2005 Posts: 215 Shop Shark | | Shop Shark Joined: May 2005 Posts: 215 | Also vacuum lines tight, vacuum advance not moving when revving | | | | | Joined: Mar 2010 Posts: 10,274 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,274 | Remove vacuum line from carburetor and apply vacuum to the pipe with a Mighty Vac to see if it holds vacuum.
You can use your mouth to draw vacuum and then plug the end with your tongue.
It should hold vacuum on your tongue until you are sure it is holding or until you hear someone coming to see why you are sucking on your truck.
If it holds vacuum, push/pull the flat metal actuator which goes into the vacuum advance to make sure it is free or bound up.
Carl
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
| | | | | Joined: Jan 2010 Posts: 4,263 Shop Shark | | Shop Shark Joined: Jan 2010 Posts: 4,263 | Also vacuum lines tight, vacuum advance not moving when revving The vac advance will not move . The distributor will move. In your pic the grease cup is hitting your vac advance preventing the distributor from moving. ...link... ...link... | | | | | Joined: Jun 2012 Posts: 1,747 'Bolter | | 'Bolter Joined: Jun 2012 Posts: 1,747 | DADS50 has got it. No need to remove the Dizzy. Just loosen the clamp screw on the vacuum advance. Pull the cap and locate the wire that the rotor is pointing at.Could be any where. Follow that wire to the plug so you know what place you are in the firing order(if that is confusing, just turn the engine by hand until your rotor points to #1 plug wire. Rotate the dizzy until the grease cup points to the back. Re-tighten the clamp screw. Now the rotor points to the location of the "new #1 location. Pull the wires out of the cap. Put the cap on and reinstall the wires starting at the "new" #1 location. Check the timing. Start and see if the vacuum advance will move now that it can. It moves? Good. It does not? Check for leaking.
Last edited by Steve_H; 04/24/2017 1:04 PM.
Steve H
| | | | | Joined: May 2005 Posts: 215 Shop Shark | | Shop Shark Joined: May 2005 Posts: 215 | Correct
Vacuum advance not actuating; distributor not rotating | | |
|
|
| |
