Originally Posted by May70
Picked up the new vac can this morning. Checked it and the diaphragm is good on new one (better safe than sorry haha). Installed it and rechecked it all.
Dwell still 31
Advance needed to be reset to 12 degrees
Before messing with carb it was idling at 710 rpm
As the manual calls I did the same thing:
L6 Engines • 20 and 30 Series
Manual Transmission
Disconnect and plug distributor vacuum line.
Turn mixture screws in until lightly contacting
seats, then back screws out four times.
Adjust Carburetor idle speed screw to obtain 600
rpm with manual transmission in neutral.
Adjust mixture screw in to obtain 550 rpm with
manual transmission in neutral.
Reconnect distributor vacuum line.
Mix Screw Adjustment (Rotations out from seated), RPM, VAC (in Hg), Notes
4, 600, 20.5
3.5, 600, 20.5
3, 600, 20.5
2.5, 630, 21
2, 670, 21.25
1.75, 695, 21.5
1.5, 720, 21.8
1.25, 720, 22 **Returned to this
1, 670, 21.5
0.75, ---, --- (Vac and rpm dropped off, very rough idle)
Backed it up to 1.25 because that was my highest vac and stable rpm (although maybe a little high).
Took the truck around the loop in my backyard and the same thing is going on. Get up to maybe 2 or 3 mph just barely past a roll and it boggs out. As soon as you let off gas it returns to stable rpm.
I got the carb cleaner out and sprayed the carb. (see pic) does that hole above the distributor vac line suck fresh air or something? It seems odd its just open. When i spray carb cleaner at it or on the back near it the rpms drop 25 or 30....
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