Once you rule out air leaks as described by others . . .
Sync dual SU Volvo carbs (prior to 1970's) [SU's are SU's]
1. warm up engine
2. Screw up mixture nuts all the way and then down 2 turns.
up = leaner, down = richer. (this is the nut at the bottom of the
carb)
3. loosen up throttle shaft couplings
4. adjust idles so carb air intake is the same, engine running (use
Unisync)
5. run adjuster nut down until smooth running; or up until rough running
and then back down
6. adjust idles so they are the same(repeat back and forth steps 4 thru 6)
Stall indicates other carb is too lean when you push up the piston
pin at the side of the carb (so you'd turn down on its richness adjustment
screw)
7. do a final idle check on both carbs using Unisync.
8. tighten nuts on throttle shafts
If you need to avoid blocking holes on face of carb with Unisync base, cut
off both ends of a can. I use and old STP Gas Treatment can (8 oz.) or a
Hunt's Tomato Paste can (6 oz.) Rubber tape around the card end can prevent
air leakage there if that appears to be a problem. . . . bill in oregon
----------------------------------------------------------------
-----Original Message-----
From: spridgets-bounces@autox.team.net
[mailto:spridgets-bounces@autox.team.net] On Behalf Of
ryan.kubanoff@comcast.net
Sent: Friday, August 13, 2010 9:04 AM
To: spridgets
Subject: [Spridgets] Carb issues...
so the car has been running really rough lately (enough that its shaking the
heater core). basically I think since my jet went on my front carb and I
replaced it with a new one and not the rear carb. I also noticed a serious
hiss coming from the back carb. so this morning i replaced the jet on the
back carb and tightened up the rear float bowl as it seemed to have rattled
loose.
I went to restart the car and its still running really rough and I noticed
that the front piston does not move up on its own but the rear does. I also
noticed that I can COMPLETELY cover the front carb with no affect to the
engine but the same on the rear carb kills the engine.
so since I am still mostly clueless. my guess is that my front carb is not
working at all and I have been potentially running around on my rear
cylinders only.
So how do i diagnose and fix this since it is now undrivable?
thanks
ryan
74 Midget 1275
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