DECARBONISATION

NZ Truth, Issue 1216, 21 March 1929, Page 19

DECARBONISATION

Any Austin Owner Can Do It For Himself Owing to the small • size of the Austin 7 engine decarbonising it is not a difficult job, and any owner can confidently undertake

it. FIRST drain the cooling system by opening the tap under the radiator. Detach the wires to the plugs, and mark them so that no mistake can be made m replacing them. ' ••-.'; Three short pieces of string, with one, two and three knots respectively tied m them, are useful as indicating the first, second, and third leads m order. •'-.',■ The -free wire will be the . fourth. . The top- water joint is freed by removing the nut screwing it to the cylinder head, and lifting it from the retaining stud without interfering with the hose connection. .-•'■.-. Be careful of the rubber washer * which forms the seat for the metal connection. Next remove the 14 nuts Which hold the he£d on to the cylinder block, and the head maybe lifted' clear. j When the carbori has been scraped from the head and top of pistons, the faces of the head, cylinder block, arid gasket must be scrupulously cleaned before, reassembling. ] ■''-„ In cleaning .but the carbon, care, must bet aken to keep it. away from the cylinder bores .and .-valve seats. . Any reliable gasket compound or .graphite grease may be used to. make 'a good joint for 1 the head. ;.'■;.- The nuts should be tightened m the order shown m the owner's handbook, a Httle at a time, until, all are right down. .■'•;,-. The wa,ter arid' high tension leads are replaced and the radiator filled.

'.%.'■ . ' . ■.''. The engine is next warmed up, when it is usually found that the nuts can be screwed down a little further. The crankcase should be drained every 1000 miles, and the gauze tray m the 1 sump cleaned about every 3000 or 3500 miles. * The washer between the crankcase and sump must be smeared with gold size .before reassembly, otherwise a leakage of oil is more than likely.