CARE OF CARBURETTOR

Shannon News, 4 November 1927, Page 4

CARE OF CARBURETTOR

HOW TO DETECT A TEAK.

The float mechanism of the carburettor which keeps the spirit ready for use at a level just below the exit from the jet, is a device which sometimes needs adjustment. The float, generally a thin spun-brass closed cylinder 4 may need adjustment. In the old days—but very seldom now — the float became punctured. How this happened .was a great mystery to the average motorist. But -it is generally due to some foreign matter in the sheet of metal while it was being rolled, and from which the two halves of the float were stamped op* spun. This foreign matter might remain in position indefinitely, or it might, by the constant jumping about of the float in the float chamber become dislodged, leaving a tiny pinhole in the float through which the spirit gradually—very gradually — leaked, thus increasing the weight of . the float and causing the level in the i float chamber —and in the jet to correspond—to rise'so that petrol flowed out of the jet. The trouble came on gradually. The cause was suspected when the float (which should, of course, be empty), was shaken near the ear. The petrol in'the float made a sound like shaken sand —a sure indication of petrol in the float. If/flooding of the earburettoy continues, due to too high level, and the float is found to have petrol in it, the remedy is to remove the petrol and solder up the hole. The hole is so small that it . cannot be seen by the~naked eye; al-

so the petrol oozes , through so slowX ]y that it evaporates as it comes through so that nothing is showing, and the location of the leak is diffi-

cult. , 1 The old method of finding out the

hole or puncture is still the best. The n float should be submerged in hot water. The heat vaporises any petrol in the float, sets up an internal pressure, and the resultant petrol gas | bubbles through the hole and up through the water.: The location of the hole is thus simple. The float should be kept submerged in the warm water till all the bubbling ceases. ,It will then'be clear of petrol, which will have all been evaporated , and forced through the leak. The

; float should be dried and allowed to t rest, so that it can become filled with air again at atmospheric pressure. Then the hole should be most carefully soldered up with soft so.lder, using a small soldering iron and scraping away the superfluous solder, so as not to increase the weight of the. float. '