Colin Ayres Posted September 28, 2020 Share Posted September 28, 2020 I have just obtained a P2 Cock O The North, R3171. What a nice thing.The speedo drive seems unattached one end either side, is this correct? It rotates and the engine runs OK.Should it somehow connect to the moulded part of the valve gear?Any help would be appreciatedRegards Colin Link to comment Share on other sites More sharing options...
Chrissaf Posted September 28, 2020 Share Posted September 28, 2020 Whilst you wait for a reply, perhaps you would spend a few minutes reviewing the TIPs in the TIP page link below:.TIP: As a newbie poster on the forum, just be aware that the 'Blue Button with the White Arrow' is not a 'Reply to this post' button. If you want to reply to any of the posts, scroll down and write your reply in the reply text box at the bottom of the page and click the Green 'Reply' button..See also – further TIPs on how to get the best user experience from this forum.https://www.hornby.com/uk-en/forum/tips-on-using-the-forum/. Link to comment Share on other sites More sharing options...
ColinB Posted September 28, 2020 Share Posted September 28, 2020 I didn't even know it had one. It definitely doesn't attach to the valve gear on mine, but there again I didn't even see one. Link to comment Share on other sites More sharing options...
Colin Ayres Posted September 28, 2020 Author Share Posted September 28, 2020 Thank you for the reply.Can anyone else assist? Link to comment Share on other sites More sharing options...
WilliamDavid Posted September 28, 2020 Share Posted September 28, 2020 The P2 was in service before speedo cables were fitted. Are you referring to the moulded parts over the front wheels, which crudely simulates any connection to the wheels? Link to comment Share on other sites More sharing options...
96RAF Posted September 29, 2020 Share Posted September 29, 2020 I have had a close look at pictures of the prototype and the Hornby models and cannot see anything resembling a speedo drive attached to the wheel cranks. There appears to be what is likely to be a lubricator off the centre drivers and various other rocking links to the valve gear but nothing else that rotates with the wheels. Maybe if you posted a close up picture of the errant part as dangling we could help more. Link to comment Share on other sites More sharing options...
Colin Ayres Posted September 30, 2020 Author Share Posted September 30, 2020 Thank you everybody for your replies. Picture attached. Have seen the part advertised as a spare ' speedo drive ' , as stated I'm still stumped, unless the plastic part above has lost a rear retaining point/ lug /media/tinymce_upload/59bcbf2edbce31e1fef6b437f109ed5e.JPGto allow it to spin ? Link to comment Share on other sites More sharing options...
Colin Ayres Posted September 30, 2020 Author Share Posted September 30, 2020 Any ideas ?/media/tinymce_upload/55d1787a828cb644b39de374dcc59539.JPG Link to comment Share on other sites More sharing options...
96RAF Posted October 2, 2020 Share Posted October 2, 2020 The joggled crank arm secured by the driver bolt should have a slot in it to keep it rotating such that the open hole is stationary about a point, giving the impression the crank is turning something about that point. The speedo 'gearbox shaft' should locate to this hole probably by way of a (missing) spigot. Link to comment Share on other sites More sharing options...
walkingthedog Posted October 2, 2020 Share Posted October 2, 2020 I think it is part of the Caprotti valve gear. Is it on the front drive wheel. If so isn't there an identical part on the other side. Link to comment Share on other sites More sharing options...
96RAF Posted October 2, 2020 Share Posted October 2, 2020 I think it is part of the Caprotti valve gear. Is it on the front drive wheel. If so isn't there an identical part on the other side. Think back to Ken's live P2 steamer project where he made a similar such thing into a working shaft either side of the loco.Rotary Poppet Valve, spoken to on page 1 near the bottom.Worth a read of the whole project but there is a picture here of the prototype...https://www.hornby.com/uk-en/forum/post/view/topic_id/25633/?p=6 Link to comment Share on other sites More sharing options...
walkingthedog Posted October 2, 2020 Share Posted October 2, 2020 He did, thing is there may well be one on the other side so the OP can compare them. Link to comment Share on other sites More sharing options...
Going Spare Posted October 2, 2020 Share Posted October 2, 2020 Images of the cylinder block/valvegear assembly X6647 show there is a circular protrusion on the inside of the square black plastic moulding (covered on the outside by the representation of the circular bearing cover) which appears to be intended to locate in to the circular hole in the crank, which as Rob says, should stay in one position rather than rotate. By applying pressure between tweezer jaws, the metal and plastic components should come back together. If a crank is rotating, it may not be positioned correctly under the crankpin screw head or the screw has been tightened too much. Link to comment Share on other sites More sharing options...
walkingthedog Posted October 2, 2020 Share Posted October 2, 2020 I reckon there is a matching one on the other side of the loco to compare it with. Link to comment Share on other sites More sharing options...
jane1707819582 Posted October 2, 2020 Share Posted October 2, 2020 Thank you for the reply.Can anyone else assist?They are not connected .on either side . Link to comment Share on other sites More sharing options...
walkingthedog Posted October 2, 2020 Share Posted October 2, 2020 So they are as they should be. Link to comment Share on other sites More sharing options...
rpjallan Posted October 3, 2020 Share Posted October 3, 2020 That definitely looks to me like the drive for the Caprotti valve gear. I have no idea why it would be disconnected. I can't lay my hands on my P2 just at the moment. Link to comment Share on other sites More sharing options...
96RAF Posted October 3, 2020 Share Posted October 3, 2020 That definitely looks to me like the drive for the Caprotti valve gear. I have no idea why it would be disconnected. I can't lay my hands on my P2 just at the moment. Just poor alignment of the plastic bits with the drive gear. Maybe gentle manipulation would better align them. Link to comment Share on other sites More sharing options...
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