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Yanmar 3GM30F wont start

Could use of starting spray cause any damage?

Could use of starting spray cause any damage?
I have a 3GM30 Yanmar in a 1998 sailboat which I purchased two years ago. The previous owner acknowledged it had been rebuilt and wasn't always starting quickly. It is getting harder and harder to start sometimes requiring repeated cranking. I have had valves adjusted, compression checked, injectors replaced, fuel filters replaced, and of course fuel line bled. When it does start it runs fine. I have, at the suggestion of a slip neighbor, tried a very small puff of starting fluid, sold in spray can which says ok for diesel and gas engines. It doesn't require much and just a short puff in the air cleaner intake does the trick, and it immediately starts the engine every time on first crank.
 
Re: "Some info for those that have

Hi Hunter User, yes, before all this happened the engine would need about 5x30 sec cranks. however always starts, very reliable with instant start when warm. Our temps here in Western Australia vary from approx. 8c to 38c
 
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