Post by dadbif on Oct 31, 2020 18:11:00 GMT
Discuss....
DECARBONIZING ENGINE
BY OXYGEN PROCESS.
The engine can be decarbonized without removing head by making use of the oxygen process. A cylinder of compressed oxygen is necessary, also a strong flexible tube with a metallic nozzle of suitable length and shape to allow it to be inserted through the sparking plug holes, and to be turned round inside the head so that the stream of oxygen can be directed on to every part of the combustion chamber and piston top. A piece of 1/4 in. external diameter copper pipe, curved about 3 inches from its end, is suitable.
First turn off the tap on Autovac (the fuel pump) controlling supply of petrol to carburetter, and run engine until carburetter is quite dry. Remove bonnet completely by lifting away from radiator and from clip on clash. Protect wings and dash with suitable coverings, as the carbon leaves the cylinders in the form of burning granules.
Next rotate the engine until the exhaust valve of. No. 4 cylinder (farthest from radiator) is just closing. (The position of exhaust valve can be seen through sparking plug hole.) The piston of No. 1 cylinder will now be approaching top dead centre, and, when exactly at top of stroke, No. 1 cylinder will be ready for decarbonizing.
Now turn on oxygen until a fairly powerful stream emerges from nozzle of pipe, and direct this stream at sparking plug hole for 30 secs. Then touch edge of sparking plug hole with a lighted taper, and the carbon will immediately catch fire. Gradually work the nozzle all round the interior of the combustion chamber. and on to piston head taking great care not to allow it to remain in any one position for more than a moment, until no more carbon emerges. During this process, the operator should stand well out of the path of the burning carbon.
When no more carbon emerges, the oxygen should be turned off, and a stream of compressed air should be directed into the combustion chamber just cleaned to remove any fragments. (A few strokes from a powerful tyre pump will accomplish this if no compressed air is available).
To prepare No. 2 cylinder for decarbonizing, turn engine until exhaust valve of No. 3 cylinder is just closing, and set piston of No. 2 cylinder on top dead centre, proceeding as before. To prepare No. 3 cylinder, set piston on t.d.c. with exhaust valve of No. 2 cylinder just closing. To prepare No. 4 cylinder ?. etc. ?
The entire operation can be carried out inside of 30 minutes and a 10 cu. ft. cylinder of oxygen should be sufficient for one engine.
DECARBONIZING ENGINE
BY OXYGEN PROCESS.
The engine can be decarbonized without removing head by making use of the oxygen process. A cylinder of compressed oxygen is necessary, also a strong flexible tube with a metallic nozzle of suitable length and shape to allow it to be inserted through the sparking plug holes, and to be turned round inside the head so that the stream of oxygen can be directed on to every part of the combustion chamber and piston top. A piece of 1/4 in. external diameter copper pipe, curved about 3 inches from its end, is suitable.
First turn off the tap on Autovac (the fuel pump) controlling supply of petrol to carburetter, and run engine until carburetter is quite dry. Remove bonnet completely by lifting away from radiator and from clip on clash. Protect wings and dash with suitable coverings, as the carbon leaves the cylinders in the form of burning granules.
Next rotate the engine until the exhaust valve of. No. 4 cylinder (farthest from radiator) is just closing. (The position of exhaust valve can be seen through sparking plug hole.) The piston of No. 1 cylinder will now be approaching top dead centre, and, when exactly at top of stroke, No. 1 cylinder will be ready for decarbonizing.
Now turn on oxygen until a fairly powerful stream emerges from nozzle of pipe, and direct this stream at sparking plug hole for 30 secs. Then touch edge of sparking plug hole with a lighted taper, and the carbon will immediately catch fire. Gradually work the nozzle all round the interior of the combustion chamber. and on to piston head taking great care not to allow it to remain in any one position for more than a moment, until no more carbon emerges. During this process, the operator should stand well out of the path of the burning carbon.
When no more carbon emerges, the oxygen should be turned off, and a stream of compressed air should be directed into the combustion chamber just cleaned to remove any fragments. (A few strokes from a powerful tyre pump will accomplish this if no compressed air is available).
To prepare No. 2 cylinder for decarbonizing, turn engine until exhaust valve of No. 3 cylinder is just closing, and set piston of No. 2 cylinder on top dead centre, proceeding as before. To prepare No. 3 cylinder, set piston on t.d.c. with exhaust valve of No. 2 cylinder just closing. To prepare No. 4 cylinder ?. etc. ?
The entire operation can be carried out inside of 30 minutes and a 10 cu. ft. cylinder of oxygen should be sufficient for one engine.