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Engine indicators

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Maurice	13/05/2013 21:10:08
469 forum posts 50 photos	Can anyone please tell me the diameter and pitch of the threads in the bushes on full size engines, into which an indicator is fitted? I wish to add this feature to a model I am making, even though it will not be used, and would rather not guess the size. Thanks. Maurice
Gordon W	14/05/2013 10:16:55
2011 forum posts	Can't help I'm afraid, 'Ive only fitted 2 indicators to two engines and the threads were compltley different. and can't remember either of them.
JasonB	14/05/2013 12:15:10
25215 forum posts 3105 photos 1 articles	This book may throw up some sizes, not had a chance to look all the way through it. Prestons always have a few for sale but don't give sizes. J
Trevor Drabble	14/05/2013 14:44:09
339 forum posts 7 photos	My Dobbie McInnes indicator has a 1.064" dia x 16TPI male thread on the bottom of the body, which I believe may be a Pg 21 conduit thread. Included in the set is a separate threaded removable collar for fitting the body to the engine. This collar has a matching internal thread to the body for half its length, whilst the other half is threaded to accept a 1.171" dia x 10 TPI whitworth form thread. Hope this helps. Trevor.
Maurice	15/05/2013 19:05:22
469 forum posts 50 photos	Thanks for the feedback gents. I thought they would be about one inch diameter, so I think I will go with the size described by Trevor. Thanks again, Maurice

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