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200 Series General Forum for the Volvo 240 and 260 cars |
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Mixture screwsViews : 691 Replies : 1Users Viewing This Thread : |
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Sep 24th, 2020, 19:13 | #1 |
Master Member
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Mixture screws
Hi, a question on mixture settings .
On the intake manifold there is a screw that adjusts the air from the valve cover breather (number 2 ) On the carb (Pierburg 175 )there is the regular Air /fuel mixture screw (number 1). How is a balance achieved between the two ? The carb is running too rich at idle ,but when I reduce either it won't idle and when it does idle the plugs are black. Is there an initial setting ? It ran fine and clean ,but just as I finished getting everything else sorted (Driveline and engine mounts) ,it started acting up. A carb strip and clean rebuild will follow. " Fed up with Brrickk" (Father Jack) Bob |
Sep 24th, 2020, 20:42 | #2 |
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Last Online: Apr 16th, 2024 07:46
Join Date: Jan 2020
Location: Corby del Sol
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Hi Bob,
The screw (2) is the slow running adjuster, (1) is the anti-dieseling circuit adjuster. Usually it is best to leave (1) alone with its factory setting and use (2) to adjust the tick-over. They sort of do the same thing - just that the anti-dieseling solenoid only acts on the circuit controlled by (1). The mixture screw is the CO adjustment screw - an indented hexagon underneath the body, pointing directly upwards in the middle, I think a 7mm socket fits well (might be 8mm, I'll check my notes in the morn). It screws inwards to make the mixture leaner. It may have an anti-tamper plastic cap over it that you may remove and store in a safe place. There is a start point set up, you will find it here in the green book: https://1drv.ms/b/s!Ask6E_1jz4xIgYRg...Dnwzg?e=i5WFp5 It is a pretty simple instrument, just start at the beginning and work your way through. I'll leave the link up for a week or so - download a copy for yourself. Good fortune, Alan Last edited by Othen; Sep 24th, 2020 at 20:49. Reason: Spelling error. |
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