Remove the air cleaner and the dashpot
screw-in top and damper. Use a screwdriver to raise the piston.sog oil seals choice materials.
Turn the jet adjuster nut up as far as it will go, or until the jet is level with the bridge inside the carburettor.
Slacken the large locking nut above the adjuster nut on the jet where it enters the carburettor body.
Now use a pencil or soft metal rod, such as a stick of solder, to push the piston right down. Hold it down and tighten the locking nut.
Check that the piston drops with a click – if it does not, repeat the centralising process.rubber sealing.
Screw the jet adjuster nut down two full turns, which should bring it near enough to the correct setting for the engine to be able to run.
Refit the air cleaner and reset the mixture. Give the piston a final click check before you screw back the dashpot screw-in top and damper.
Adjusting a Stromberg carburettor
The Stromberg CD carburettor, like the SU (See Adjusting an SU carburettor), is a constant-depression carburettor, hence the CD.
The two work in much the same way, but the Stromberg differs in having an air valve – commonly called the piston – surrounded by a rubber diaphragm in the dashpot.
The size and type of a Stromberg are given by numbers and letters. Numbers such as 125, 150 and 175 are sizes: they mean a choke diameter of 1 1/4, 1 1/2 and 1 3/4 in. The size makes no difference to the way you tune the carburettor.
Types include CD, CDS, CD2S and CD3, all used on older cars made before anti-pollution laws demanded emission-control fittings.
Leave the air cleaner in place if you can, so that adjustments are made with the carburettor as close as possible to its normal working condition. However, this may not be possible, depending on the car, the type of carburettor and the adjustment being made.shaft seal.
Later types with emission control have the letter E, as in CDSE and CD2SE. Tuning methods vary according to type, but Strombergs are not stamped with their type marks.
Information in the car handbook should help you to identify your type.sog oil seals choice materials.
Before starting to tune the carburettor, check out all the other systems such as sparkplugs, contact-breaker gap and the ignition timing (See How to drain engine oil and remove filter).
Although valve clearances seldom need resetting between major services, always check them before attempting to tune the carburettor.
The fast-idle stop screw opens the throttle when the choke is pulled out. There must be a gap between its head and the choke cam when the choke is pushed home.
The CD and CDS have different cold-starting devices, but the adjustment works in the same way.
Set the gap according to the car-makers recommendations – usually about 1mm.
Some Strombergs have a two position screw to limit the use of the choke according to the season. It has a spring under its head. Set it with the spring compressed for summer and the tension released for winter (only necessary in freezing weather)dust seal.
Check, too, that the damper tube is topped up with oil to within 1 in. (6 mm) of the end of the rod.
Use ordinary multigrade engine oil or the special SAE 20 oil made for the purpose by Zenith (the makers of Stromberg carburettors). Tune with the engine running at working temperature.sog oil seals choice materials.
Turn the jet adjuster nut up as far as it will go, or until the jet is level with the bridge inside the carburettor.
Slacken the large locking nut above the adjuster nut on the jet where it enters the carburettor body.
Now use a pencil or soft metal rod, such as a stick of solder, to push the piston right down. Hold it down and tighten the locking nut.
Check that the piston drops with a click – if it does not, repeat the centralising process.rubber sealing.
Screw the jet adjuster nut down two full turns, which should bring it near enough to the correct setting for the engine to be able to run.
Refit the air cleaner and reset the mixture. Give the piston a final click check before you screw back the dashpot screw-in top and damper.
Adjusting a Stromberg carburettor
The Stromberg CD carburettor, like the SU (See Adjusting an SU carburettor), is a constant-depression carburettor, hence the CD.
The two work in much the same way, but the Stromberg differs in having an air valve – commonly called the piston – surrounded by a rubber diaphragm in the dashpot.
The size and type of a Stromberg are given by numbers and letters. Numbers such as 125, 150 and 175 are sizes: they mean a choke diameter of 1 1/4, 1 1/2 and 1 3/4 in. The size makes no difference to the way you tune the carburettor.
Types include CD, CDS, CD2S and CD3, all used on older cars made before anti-pollution laws demanded emission-control fittings.
Leave the air cleaner in place if you can, so that adjustments are made with the carburettor as close as possible to its normal working condition. However, this may not be possible, depending on the car, the type of carburettor and the adjustment being made.shaft seal.
Later types with emission control have the letter E, as in CDSE and CD2SE. Tuning methods vary according to type, but Strombergs are not stamped with their type marks.
Information in the car handbook should help you to identify your type.sog oil seals choice materials.
Before starting to tune the carburettor, check out all the other systems such as sparkplugs, contact-breaker gap and the ignition timing (See How to drain engine oil and remove filter).
Although valve clearances seldom need resetting between major services, always check them before attempting to tune the carburettor.
The fast-idle stop screw opens the throttle when the choke is pulled out. There must be a gap between its head and the choke cam when the choke is pushed home.
The CD and CDS have different cold-starting devices, but the adjustment works in the same way.
Set the gap according to the car-makers recommendations – usually about 1mm.
Some Strombergs have a two position screw to limit the use of the choke according to the season. It has a spring under its head. Set it with the spring compressed for summer and the tension released for winter (only necessary in freezing weather)dust seal.
Check, too, that the damper tube is topped up with oil to within 1 in. (6 mm) of the end of the rod.
Use ordinary multigrade engine oil or the special SAE 20 oil made for the purpose by Zenith (the makers of Stromberg carburettors). Tune with the engine running at working temperature.sog oil seals choice materials.
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