richard.goode(at)russiana
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 Posted: Mon Dec 10, 2007 7:35 am Post subject: No Title |
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Starting procedures
Too many people have problems starting the M14P, and many do not stop to think why.
In my view, the principal issues are:
- Clearly ALL oil needs to be out of the lower cylinders - and to this end a manifold oil drain system is really important.
- In any case the propeller should be turned through at least ten revolutions.
- Russian engineers will only turn the prop after priming IF the air pressure is very low - and in my view is seldom necessary.
- It is not logical to have a fixed number of primes to the "system" - i.e. carburettor, and to the cylinders, since air can be in the fuel lines, and so the amount of fuel cannot be certain until the lines are filled with fuel.
- An important point is to prime the "system" so that the carburettor is filled with fuel, and excess is returning to the fuel system. It does not matter how much the "system" is primed - the excess will always return.
- However, on priming the cylinders you can find that the first few primes are actually only pumping air - you can feel when you are pumping fuel.
- Priming into the cylinders should be done carefully to avoid over-priming. Once pumping fuel is felt, primes should range between four and eight, depending on the engine and the coldness of the weather.
- Importantly starting is with the magnetos OFF.
- Having primed as above, the engine SHOULD start within a couple of blades. If however it does not, there is no point in persisting to turn the engine.
- Typically, if it is too weak it will not fire, and so needs more priming.
- If it kicks back, then it is probably too rich, and in that case it is worth switching everything off including the master-switch; closing the throttle; getting out and turning the propeller in its normal direction for (say) three revolutions.
- If primed correctly, and in reasonable condition they will always start!
- Only when the engine fires, should you then switch the magnetos on.
- You should be prepared to give an additional one / two primes (depending on weather etc) into the cylinders immediately after firing to keep the engine going, or you can pump the throttle to give the same effect.
Richard Goode Aerobatics
Rhodds Farm
Lyonshall
Herefordshire
HR5 3LW
United Kingdom
Tel: +44 (0) 1544 340120
Mob: +44 (0) 7768 610389
Fax: +44 (0) 1544 340129
www.russianaeros.com
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