From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Correction sheet with installation checks and tests for a faulty Hobson K-S Telegage.
| Identifier | ExFiles\Box 44\4\ Scan105 | |
| Date | 1st February 1930 | |
| Feb. 1930. X4038. Correction Sheet (3) FOR THE HOBSON K-S TELEGAGE MADE BY H.{Arthur M. Hanbury - Head Complaints} M.{Mr Moon / Mr Moore} HOBSON LIMITED 47/55, THE VALE, ACTON, LONDON, W. 3. Telegrams: "ASSEMBLAGE, LONDON." Telephone : CHISWICK 4231 (4 lines). BRITISH MADE Correction of a faulty Telegage installation is very simple. This is assuming that you will actually DO what is set down for your guidance; that you will make no substitutions, but do exactly as dictated, OR GET NO RESULTS. WARNING : Do not remove gauge from Instrument Board or start putting on new units until you have followed these instructions. FOUR INSTALLATION CHECKS MAKE THESE FIRST I—Remove tank filler cap. See that tank vent is free and open. Do not replace cap. II—Disconnect Gauge Line (Air Line) and Pressure Balance Air Line at instrument board end from Gauge Head and make Gauge read level with the bottom line on the dial. If necessary liquid can be added or removed at the top of the Brass Tube where the Air Line disconnects. To fill use a Medicine Dropper, being careful not to overfill. To remove liquid, use a wooden match to absorb some from the Brass Tube. USE ONLY HOBSON K-S TELEGAGE LIQUID, NONE OTHER WILL DO. III—Dry Air Line and Pressure Balance Air Line. Same procedure for both Lines. (Follow exactly or get no results). The Pump Air Line need not be disconnected. 1. Use a Hand Tyre Pump. We do not mean anything but a Hand Tyre Pump. 2. Cut metal connection from tyre pump hose (Positively). 3. Push hose securely over instrument board end of Air Line and Pressure Balance Air Line. 4. Give 50 good full strokes continuously. (At least). IV—Reconnect Air Line and Pressure Balance Air Line, being sure that connections are tight. Before you connect, inspect Gauge for traces of leakage at top of Glass Tube. Verify that instrument holds its reading and does not leak, otherwise the instrument must be changed. Try Tank Unit connections to be sure they are tight. Replace tank filler cap. You are now ready to test to see if the trouble is a defective unit or a faulty installation which you have corrected by the above adjustments. TEST I—Determine whether you can bring gauge up to proper reading by supplying air to the Tank Unit. Method—The right method of supplying air is by operating the Hand Pump until the red liquid no longer rises. If you can get a reading that will stay set with car standing, the Telegage is correct. If you cannot get a reading by pumping or if the reading drops and will not stay set with the car standing, locate failure by TEST No. II. TEST II—Determine whether the failure is in the Air Line, Pressure Balance Air Line or Tank Unit. 1. Disconnect both Air Lines front and rear. 2. Inspect connections for dirt and flaws. 3. Hold a finger over one end and suck on the other. If the suction created will hold the tongue for one minute, the Air Line is correct. 4. If either Air Line shows a leak, change the triple Air Line Assembly. 5. If the Air Line and connections are sound, the defect is in the Tank Unit, which should be changed. CAUTION : Whenever repairs are made on the Telegage, both Air Lines should be blown out from the instrument board end to clear them of any petrol which may have been driven into the lines when they are disconnected. (See installation Check 3.) SERVICE—HOBSON K-S Telegage liquid can be secured from H.{Arthur M. Hanbury - Head Complaints} M.{Mr Moon / Mr Moore} HOBSON Ltd., at cost. It is stocked in 1/8 oz., 1 oz., 2 oz. and 6 oz., bottles. Any Telegage parts which fail from manufacturing defects will be replaced, free of charge. (THIS IS THE CORRECTION SHEET.) | ||