H6 SU twin carbs on '67 Volvo 1800S. The car had been sitting for a while but was easy enough to start up. Decided to remove dashpot piston/needle and give it a clean and polish, removed the needle tube and cleaned. Also did float and chamber. Assembled all adjusted fuel control nuts up so tube was level with venturi bridge and backed them off 12 flats (as prescribed) topped up Dashpots (ATF) pistons all sliding well. Started up motor and lots of black smoke. wound the nut back in 6 flats still black smoke, wound nuts all the way up and no change. Have checked the choke lever is fully home, redid all the above again and there is some improvement but at 6 flats (only). It was running fine before the lay up period. Have used new fuel. Starts straight away just a skerrick of bypass. Plugs? any clues?
bjmh,
Oct 29, 3:10pm
can you refit the needle tubes upside down ? also if you had the needle out is it flush with the base.
bjmh,
Oct 29, 3:12pm
check float levels as well,could be just flooding
bwg11,
Oct 29, 3:14pm
Are the jets correctly centred? With the jet tube level with the bridge, do the pistons fall with a distinct "clonk" when raised and released? If not, re-centre the jets. If the needles are binding in the jets, the piston can't rise freely causing a rich mixture.
jmma,
Oct 29, 3:15pm
Agree with checking needle flush with base, also did you check float level (o: If all correct, sell and buy a Corolla Lol :oP
poppy62,
Oct 29, 3:55pm
Left the needle in the piston, so have not changed the position. Checked float level (3-4 X) fuel about 1/2 way in chamber. Tubes only go one way, pistons are falling Ok but will re -centre the jets, although the pistons do raise up freely. Noticed the lever on the carb, for the choke operation where it connects to the needle tube was quite difficult to reconnect after cleaning. may be holding the tube out of skew. Have to check that out too. Thanks guys.
poppy62,
Dec 22, 8:02pm
Howdy mate! just spent a week driving around Norfolk Is ( Isle of the Newly Wed and the Nearly Dead ) in one of your "fyne" T cars . Spastico or something. By the time I returned it I was as grey looking as the car. It's just that it lacked that "joie de vivre" that you only get out of a high class Euro. It actually reminded me of the feeling one gets when Going to work on a grey rainy Monday morning.
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