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This weekend, we were running my dad's 671 turbines with the streamlined tenders.  The whistle was working well, but it kept sticking on.  I popped the shell off the tender and the whistle relay was sticking -- the little metal "foot" was staying in the up position after releasing the whistle button.  I fearlessly sprayed some compressed air from a can -- the type you use to clean a keyboard -- on the relay assembly, and placed the tender back on the track.  Now the relay "foot" doesn't stick but the whistle is dead.  The motor doesn't spin.  What did I do?  I feel like Charlie Brown in the Christmas special when he kills the little Christmas tree . . . .  Any help appreciated, so thanks in advance.

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Thanks for the advice.  I went through and serviced the tender whistles some months ago, including new wiring, so this one was whistling up a storm, so other than the fact that the relay sticked it whistled quite well.  Once I blew the compressed air onto the relay it went dead.  I'll try to clean the contact points and check the connections but it is perplexing to me, to say the least. 

When servicing a whistle tender, I usually unsolder the wires going to the relay (digital camera is invaluable), remove the relay from the tender, and remove the screw holding the insulators and wire contacts on the side. I then remove the non moving contact and clean it with 1200 grit sandpaper, and clean the moving contact without bending it. I then spray the pivot area of the moving contact with CRC Electramotive. After everything is dry I reassemble it and make sure the gap between the two contacts is around .020 inch, about the thickness of a matchbook cover. This often improves the performance of a whistle motor, especially when combined with cleaning the armature and brush plate, and the brushes. 

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OGR Publishing, Inc., 1310 Eastside Centre Ct, Ste 6, Mountain Home, AR 72653
800-980-OGRR (6477)
www.ogaugerr.com

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