Cd 175 Service Manual
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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. Honda CD125 CD 125 Workshop Maintenance Service Repair Manual. Honda CD175 CD 175 Exploded View Parts List Diagram Schematics.
The Stromberg carburettor does not have a regular service schedule, but should be cleaned about once a year. Replace worn parts as necessary.
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Dirt which has penetrated the fuelfilter, and residues from chemicals in petrol build up inside. Needles and jets wear out after a few years' use.
The rubber diaphragm may become holed - and even a tiny hole causes loss of engine power. As the hole enlarges, the engine will eventually do no more than idle.
Remove the carburettor from the car to clean it. Keep it upright to avoid spilling petrol, then empty it safely. Clean all parts except the diaphragm by rinsing in a dish of petrol.
Unscrew the damper from the top of the piston chamber - commonly called the dashpot. Pour the oil inside it away.
Mark the dashpot top so that you can refit it to the chamber the same way round.
Remove the screws and lift off the top carefully, making sure that the piston spring does not catch and so drag out the piston.
Check that the diaphragm, which will come out when you remove the piston, is not stuck down around its edge: it is easily torn.
Lift out the piston, pulling it straight up so as not to bend the needle in its base. Note that on the diaphragm edge there is a tab that fits into a slot in its seating on the chamber base.
After reassembly, refill the dashpot with multigrade engine oil to just above the level of the brass piston inside the tube - or you can obtain a special SAE 20 oil made by the carburettor manufacturers.
A badly worn jet needle has a groove round it, but less severe wear is invisible.
Wear does, however, affect performance, so replace the needle every few years.
There are many needle sizes: be sure to get exactly the right one. Remove the needle by loosening the grub screw in the side of the piston.
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To remove the diaphragm carefully undo the screws of its retaining ring.
Lift off the retaining ring and diaphragm. Hold the diaphragm up to the light and check it minutely for the tiniest hole.
if it has become perished, hard or misshapen, renew it.
Be sure to fit the new diaphragm the right way round and the right way up. There is a tab on its inner edge that fits into a recess in the piston.
Take care not to get oil or petrol on the diaphragm, and not to nick or tear it.
Loosen the grub screw to free the needle.
The diaphragm is held on by a ring and four screws; do not nick the rubber with the screwdriver as you remove them.
Pull the diaphragm gently and hold it up to the light to show any pinholes.
Before removing the float chamber, pull the adjuster stop off the jet with pliers. Note that emission-control models (See Adjusting an emission-control carburettor) do not have such a stop.
Take out the six screws securing the float chamber. You should then be able to lift the chamber off — but the sealing ring around the jet may make it stick.
Pull carefully: a sharp jerk or twist might damage the float.
With the chamber removed, pull out the float pin to free the float.
Older models have a pin that you can usually remove with your fingers. If it is stiff, gently prise it out sideways with a thin screwdriver. Emission-control models have a pin set in clips: lever it out carefully with a screwdriver.
The float needle valve is screwed into the base of the float chamber. It is in one piece and cannot be dismantled for cleaning. If it is worn it must be replaced.
Stromberg 175 Cd Service Manual
If the float needle valve is blocked you may have to replace it.
A float is maladjusted, or is leaking so that it no longer floats properly, causes persistent flooding of the carburettor.
Shake it - if fuel splashes inside, it is leaking and must be replaced.
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If adjustment fails to cure the flooding, that too calls for a new float and a new needle valve.
With the carburettor upside-down, measure the height of the bottom of the float (now at the top) above the edge of the body.
The height should be 16 to 18mm long for a hollow float or 18.5 to 19.5 mm for a solid float.
Adjust the float by bending the tag that touches tho needle valve, or by fitting a thicker or thinner washer under the valve.
With the carburettor inverted, measure the height of the float above the body edge.
Bend the tag to adjust the float height.
Do not remove the jet of an emission-control model (See Adjusting an emission-control carburettor): a special adjusting tool is needed for its castellated adjuster nut. Do not even turn it: this alters the mixture. Clean it in place by washing with clean petrol; blow it clear with a foot pump.
Remove a conventional jet by unscrewing the holder, using a spanner on the lower of the two hexagonal parts. Do not move the jet-adjusting screw, as this will alter the mixture (See Adjusting a Stromberg carburettor).
Lift off the jet holder and pull out the jet. Wash the jet in clean petrol and blow through it with a foot pump to clear it.
Check the rubber '0' ring round the jet holder for signs of wear or cracking. A failed ring will allow petrol to leak from the float chamber.
Lever off the ring with a pin or thin screwdriver; take care not to scratch the surface. Roll the new ring on over the holder.