Les,
If you crank the engine with an air wrench (I assume you mean an air IMPACT wrench) you will do up the crankshaft pulley bolt way tighter than it is designed for. This is not a good idea.
On the other hand if you crank it for 2 to 3 mins with the starter and then it does start, that will very effectively pre lube all the bearings while putting very little load on them as it is taking that long for fuel to get to the carb and the engine will have oil pressure when it does start. If you keep an eye on the oil pressure light when cranking it you should see it go out quite quickly even if the engine has been stood for several years.
I agree with Rob Love that 6 months is just not a long time in this context. Don't worry about the wear on the starter, it will not noticeably shorten it's life to operate it for an extra 3 mins per year !
David
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30-01-19, 17:13
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