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Thanks jkordzi and spook for you replies. I’m glad the recording was a help.
As a kid I can remember doing just as you mentioned with my bike using an old postcard, and from what I can remember the sound which my engine now makes is very similar to that of the postcard on the spokes.
I think the starter motor theory is one which is well worth exploring further. It had crossed my mind earlier, but I sort of dismissed it as I thought the sound may be coming from further forward in the engine. As there isn’t much left to look at, and knowing that sound can reflect is strange ways in a confined space, I’m sure that it could be a sticky solenoid or similar, I’ll have a further look and listen.
One point that adds to the theory, is that the previous owner had the engine compartment valeted (steam cleaned?) before putting the car up for sale. The car remained in his garage for 2-3 months before we bought it during this summer. I suppose that if some water got into the starter motor and it was then left idle, that there could be a slight build up of contaminants on the motor, solenoid shafts etc. resulting in sluggish action and hence the possible slow disengaging of the pinion. If after further examination (external) I find that the starter needed further examination (removal) is it possible to lubricate its main parts?
The dealer thought that the tensioner was the source of the noise. It sounded a bit dry, but was not particularly rough. The camshaft oil seal started to leak a bit more so I asked them to replace it along with the tensioner and also fit a new timing belt (and check for the belt rubbing on the case). I think they were convinced that this would cure the noise forever.
Alas no! - Never mind, we can rest assured that the problem doesn’t lie in this area anymore.
I had thought about a stethoscope, but it’s not something that I could find locally, but I’m sure it would be a worthwhile investment for the future. (perhaps I can also use it to check my blood pressure during trying times with the car!)
Many thanks for your help - Jonathan
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