RMweb Premium OnTheBranchline Posted May 17, 2023 RMweb Premium Share Posted May 17, 2023 LNER Q6 cylinder failure Found this online - not by me. 3 Link to comment Share on other sites More sharing options...
RMweb Gold big jim Posted May 17, 2023 RMweb Gold Share Posted May 17, 2023 Was that an official engineers assessment at the end? 1 1 3 Link to comment Share on other sites More sharing options...
RMweb Gold Phil Bullock Posted May 17, 2023 RMweb Gold Share Posted May 17, 2023 48 minutes ago, OnTheBranchline said: LNER Q6 cylinder failure Found this online - not by me. Oh dear that’s a shame…. But best not to speculate, could be anything from relatively trivial to very serious. Link to comment Share on other sites More sharing options...
rogerzilla Posted May 17, 2023 Share Posted May 17, 2023 Call Piglet! 3 Link to comment Share on other sites More sharing options...
APOLLO Posted May 17, 2023 Share Posted May 17, 2023 34 minutes ago, big jim said: Was that an official engineers assessment at the end? Piston Broke !! Brit15 7 Link to comment Share on other sites More sharing options...
Bon Accord Posted May 17, 2023 Share Posted May 17, 2023 A couple of pictures on Facebook. https://www.facebook.com/photo?fbid=563454599239020&set=pcb.563459872571826 4 Link to comment Share on other sites More sharing options...
didcot Posted May 17, 2023 Share Posted May 17, 2023 That's unfortunate. Certainly looks like a split cylinder. Link to comment Share on other sites More sharing options...
rogerzilla Posted May 17, 2023 Share Posted May 17, 2023 Is it cast in one piece with the smokebox saddle? Looks too far gone for metal stitching. 1 Link to comment Share on other sites More sharing options...
RMweb Gold Bucoops Posted May 17, 2023 RMweb Gold Share Posted May 17, 2023 55 minutes ago, rogerzilla said: Call Piglet! Call him what though? Sad to see, hope it's repairable... 1 Link to comment Share on other sites More sharing options...
peterfgf Posted May 17, 2023 Share Posted May 17, 2023 It is a very odd failure mode. The circumferential stress is usually twice the longitudinal stress and high stresses should have blown the cylinder apart like a burst gun barrel. I suspect there is an unknown factor at work - corrosion or undiscovered casting defect. Unfortunately I think it means a new cylinder block but can't be sure at this distance. I don't really like metal-stitching (Metallock) on stressed parts - alright for holes in crankcases but not otherwise. Petertfgf 2 1 Link to comment Share on other sites More sharing options...
Aire Head Posted May 17, 2023 Share Posted May 17, 2023 7 minutes ago, peterfgf said: It is a very odd failure mode. The circumferential stress is usually twice the longitudinal stress and high stresses should have blown the cylinder apart like a burst gun barrel. I suspect there is an unknown factor at work - corrosion or undiscovered casting defect. Unfortunately I think it means a new cylinder block but can't be sure at this distance. I don't really like metal-stitching (Metallock) on stressed parts - alright for holes in crankcases but not otherwise. Petertfgf The right hand cylinder had a previously discovered crack which had been repaired. 3 Link to comment Share on other sites More sharing options...
peterfgf Posted May 17, 2023 Share Posted May 17, 2023 2 hours ago, Phil Bullock said: Oh dear that’s a shame…. But best not to speculate, could be anything from relatively trivial to very serious. Thtat's rather spectacular. Definitely a clean underpants moment. Link to comment Share on other sites More sharing options...
peterfgf Posted May 17, 2023 Share Posted May 17, 2023 8 minutes ago, Aire Head said: The right hand cylinder had a previously discovered crack which had been repaired. I had another look at the photos. The crack surfaces look corroded so the crack could have been present for some time. Link to comment Share on other sites More sharing options...
didcot Posted May 17, 2023 Share Posted May 17, 2023 A friend sent me the same pics from Facebook. My first comment was that's an old fracture as it isn't clean. He also mentioned it had been stitched. It was lucky that it failed where it was on the crossing as you can see something flying out as the cylinder let goes. Well away from people. Glad no one was hurt. 2 2 Link to comment Share on other sites More sharing options...
rogerzilla Posted May 17, 2023 Share Posted May 17, 2023 I like the way the train keeps going. That is the thing with steam - it sort of works even when mortally wounded. Would probably never restart on one cylinder, though - no torque at front or rear dead centres! Link to comment Share on other sites More sharing options...
RMweb Gold papagolfjuliet Posted May 18, 2023 RMweb Gold Share Posted May 18, 2023 13 hours ago, rogerzilla said: Is it cast in one piece with the smokebox saddle? Looks too far gone for metal stitching. A replacement cylinder was already in hand; drawings had been prepared and a pattern maker was being sought, the intention being to replace the cylinder during 2023/24 winter maintenance. 3 8 2 Link to comment Share on other sites More sharing options...
RMweb Gold Phil Bullock Posted May 18, 2023 RMweb Gold Share Posted May 18, 2023 That’s good to hear …. The issue was well understood then. At the end of steam a damaged cylinder would have meant a one way ticket to the scrapple…. Look at what the movement can do now, Bradley Manor a prime example. 1 Link to comment Share on other sites More sharing options...
RMweb Gold papagolfjuliet Posted May 18, 2023 RMweb Gold Share Posted May 18, 2023 Announcement from the NELPG, copied from elsewhere: CLASS Q6 63395 – RH CYLINDER FAILURE 16.05.23 Class Q6 number 63395 suffered a failure of the right-hand cylinder yesterday while working a train out of Grosmont. The failure is being investigated and it is too early to suggest the cause. The locomotive had passed all routine examinations and has been working well in the early part of the NYMR season, having run over 2000 miles. When we have more news we will let you know. NELPG Board of Trustees 1 10 Link to comment Share on other sites More sharing options...
RMweb Premium Dava Posted May 21, 2023 RMweb Premium Share Posted May 21, 2023 The J27 had a replacement inside cylinder block made & fitted around 9 years ago, they know what they’re doing. 4 1 Link to comment Share on other sites More sharing options...
RMweb Gold adb968008 Posted June 16, 2023 RMweb Gold Share Posted June 16, 2023 (edited) Whilst jumping ahead of ones self, the old cracked block could make an interesting museum exhibit in its own right, has a story (and video) to tell and educational about maintenance, as well as how the the inside design of how a cylinder works. I hope thye dont just toss it. Edited June 16, 2023 by adb968008 2 5 Link to comment Share on other sites More sharing options...
RMweb Gold Bucoops Posted June 16, 2023 RMweb Gold Share Posted June 16, 2023 37 minutes ago, adb968008 said: Whilst jumping ahead of ones self, the old cracked block could make an interesting museum exhibit in its own right, has a story (and video) to tell and educational about maintenance, as well as how the the inside design of how a cylinder works. I hope thye dont just toss it. A prime (ha ha - not that I am saying that is what happened) candidate for that is the block from Green Arrow. Construct a modern replacement using the same techniques that they used for the new build P2 and the old one would make a heck of an exhibit. 1 2 Link to comment Share on other sites More sharing options...
RMweb Premium Dava Posted June 17, 2023 RMweb Premium Share Posted June 17, 2023 The pattern for the J27 was made the old way, a work of craft by a young pattern maker, I saw it. Can now be done in CAD & 3D print. A disappearing art? You still need a foundry to pour the metal and machine shop to bore & finish it. Dava Link to comment Share on other sites More sharing options...
DougN Posted June 18, 2023 Share Posted June 18, 2023 On 17/06/2023 at 07:40, Bucoops said: A prime (ha ha - not that I am saying that is what happened) candidate for that is the block from Green Arrow. Construct a modern replacement using the same techniques that they used for the new build P2 and the old one would make a heck of an exhibit. I would love to see Green Arrow running again also. Interesting comparison with Flying Scotsman and the A4s as some are still running... 4 Link to comment Share on other sites More sharing options...
RMweb Gold chris p bacon Posted June 18, 2023 RMweb Gold Share Posted June 18, 2023 3 hours ago, DougN said: I would love to see Green Arrow running again If only there was a Finney kit of one....😂 Link to comment Share on other sites More sharing options...
DougN Posted June 19, 2023 Share Posted June 19, 2023 13 hours ago, chris p bacon said: If only there was a Finney kit of one....😂 Yeah, must get back to that.... been a couple of years since I did too much on the pair of them! 2 Link to comment Share on other sites More sharing options...
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