“SUN” SERVICE STATION

Sun (Auckland), Volume II, Issue 586, 12 February 1929, Page 6

“SUN” SERVICE STATION

rpHE "Motordom” section of The Su n includes in its service to readers a Queries and Answers Department, the object of which is to give accurate information regarding mechanical and touring subjects. Whatever the particular puzzle may be in either diagnosing Irritating troubles, or motoring Information of any kind, “Headlight” will endeavour to help, or refer the point to men who are recognised automobile experts in their respective lines. All communications must be accompanied by the inquirer’s name and address (not for publication), and sent to THE SUN “Service Station, Motordom,” THE SUN. Auckland. Answers will appear weekly In this column.

W.O.D. —After trouble with starting my car I found that the plugs had wide gaps and were dirty. I cleaned them and set the points closer and now the engine starts very easily, but has no power on hills. Do you think the plug points are too close now—l don’t lf.e touching them unless I’m sure.

Spark plug points set too close would cause "pinking” or pre-ignition on hills and this would very probably be your trouble.

A. B.—My ammeter will not show a charge of more than three amps., and its charging rate should be nine amps. 1 blamed the dynamo, had it tested, and it came back as O.K. Then I put on a new ammeter, and the charge is still three amps. If the dynamo is in good order, and a tested ammeter is provided, where does the current go?

Your problem is nice, but you have forgotten that there is more in an electrical circuit than a dynamo and an ammeter. There is a battery and quite a little wiring. If the dynamo is producing nine amps, and the battery is not receiving it, there must be resistance somewhere. The resistance may be somewhere in the circuit. Have you had the wiring and cables examined. The trouble, I believe, is in the battery itself. It may hee offering,

resistance through some fault. Get a replacement battery on hire and fit that, then see how the ammeter behaves. If it still undercharges, look to the wiring and find the resistance. P.S.S.— Will you please answer the following question regarding a 1024 Ford V I used to find the car would vibrate at 30 to 31 miles an hour and would run smooth again from 32 to 35 miles an hour. At speedo reading of 22,000 miles I had again overhauled and worn parts replaced and valves ground. 1 drove 500 miles at 20 per and 400 at 25 per, and thought that I would step up to 30 and 35 for long drive, but found that car vibrated at 29 miles an hour and continues to vibrate to any speed above 29. Any information for the remedy of this vibrating would be appreciated. * * » Have the car inspected by a recognised Ford expert mechanic, as there may be several things that cause this variation. E.L.L.—Would you kindly advise me through your query.column an answer to the following question? Overland sedan, equipped with disc wheels and 31 x 5.25 tyres, I want to change to smaller tyres, what other tyres can I use on the same wheels? Thanking you in advance. You can use 30 x 4.95 tyres, but it is not advisable.