“SUN” SERVICE STATION

Sun (Auckland), Volume III, Issue 633, 9 April 1929, Page 6

“SUN” SERVICE STATION

rptlES “Motordom" section of The Su X Queries and Answers Departmen accurate information regarding mecha ever the particular puzzle may be or motoring information of any kind, refer the point to men who are rec respective lines. All communications must be accoi address (not for publication). an 2 dom.” THE SUN.. Auckland. Answer "Entomologist”: Could you tf-11 me I about the German. motor-cyei "Hanomag,” which I believe a lot of interest overseas, particulaily 1 about its mechanical features. Th« “Hanomag” is a very interestin.B vehicle, and I am now collecting details for a special article next week. H L : Can you give me information regarding a Van Sickler speedometer, on k 1921 Cleveland Six? The portion on the right that is marked "Trip works, but only the first figure on, the cross registers. The present reading is “Gross.” 09997, and only the '7 changes. The speedo is slightly out of square, and the figures ai-e on an angle. Would this make a difference to its functioning. The movement of the mileage numerals on a speedometer usually is goveniea by a series of cams. When the first digit has made a complete revolution, a cam on its rim engages with a lever on the rim of the second numeral and forces it around and so on through the four figures. Obviously, the cam on your first digit is not engaging with the lever on the second and, therefore, further movement is suspended. • This may be caused by wear, or may be due * to the fact that the figures are not at the right angle in the mechanism, which may provide a gap between the first and second figures. A tiny gap would be sufficient to allow the cam to scrape past the lever. Another possibility is that the shaft which carries the revolving figures is fractured. "Ford Lorry": Could you tell me the reason why a Ford truck is hard to crank without jacking up the rear l wheelV. It is also hard at times to start

n includes In Its service to readers a it the object of which Is to give mical and touring subjects. Wliateither diagnosing Irritating troubles, ‘Headlight” will endeavour to help, 9r lognlsed automobile experts in their ►mpanled by the inquirer's name and to THE SUN ‘‘Service Station, Motorrs will appear weekly In this column. [ off the magneto. Sometimes she starts well, but at other times 1 have to start with the battery. I suggest your trouble is due to end play in the transmission, which causes the' distance between the stationary coil and magnets to vary, thus making starting difficult. The action of jacking up the truck facilitates matters owing to the fact that your back wheel acts as an extra flywheel, and enables you to crank the engine faster than under ordinarv conditions, together with the fact of the engine being in top gear, which throws the magnet nearer to the stationary coil. The remedy therefore is to take your car to the nearest authorised Ford dealer and have him overhaul your transmission. "K.”: Could you tell me why my engine gets very hot and water boils on a medium hill? The radiator is perfectly clean, and fan belt is fairly tight. What is the cause? As it is stated that all the points that usually cause over-heating are apparently in order, I am certainly of the opinion that the trouble is confined to the radiator itself, for it is impossible to determine that the core is clean and clear inside without inspection. A common mistake made with most makes of cars is that too much grease is forced into the water pump glands by means of the special greaser usually provided, for this finds its way into the radiator core, causing partial blockages, which of course gradually become worse as time goes on, and this is sometliing that is difficult to deal with on an old radiator. It may he possible for you to arrange to test the car out. with another similar radiator which is known to be in good order.