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Post by AndrewP on Jan 28, 2008 15:48:26 GMT
I've finally got my (bought!) Juliet 2 chassis running on air - albeit lumpy and only forwards I'm chasing a tight spot which doesn't show up in measurements and partial assembly so I thought I might run it on air for a while and see if it would 'bed in'. Since I haven't fitted a lubricator yet any advice on length of time to run? I can easily inject oil into the air line and obviously lube all the bearings etc.
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Post by ron on Jan 28, 2008 16:12:38 GMT
Hi Andrew I recently ran my Simplex chassis on air and if you can relube via the air line I would say you could almost run it indefinitely. The only problem I came across was the small compressor I was using doesn't have a water trap so I had to strip and clean the cylinder units of mayonaise after quite a short run. I've got a big compressor I use for paint spraying and gritblasting with good driers so once the weather impoves I'm going to give it a long run with that. Ron
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jackrae
Elder Statesman
Posts: 1,333
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Post by jackrae on Jan 28, 2008 17:02:44 GMT
Andrew, What's your cylinder and piston rings made from. If both are cast iron then you shouldn't need lubrication.
It's possible that the tight spot is in your con-rod geometry. Either way these and the axle boxes will need lubrication frequently to prevent damage
Jack
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Post by AndrewP on Jan 29, 2008 0:33:18 GMT
Thanks chaps, gunmetal pistons and cylinders with soft packing so no worries there? Ron, my small compressor (air brush type) won't get near it and the big ones (6cfm) are noisy aren't they - I've resolved to stop at midnight I found a couple of tight spots, basically connecting rod rubbing on wheelface/axle end as it passed over it - they have been, erm, relieved shall we say. I think the problem may well lie with one coupling rod which will only go on with all the play in the axle boxes taken up, it may be a few thou too long, I feel an offset bush coming on, or whip a bugs off the axle box maybe but that seems a bit like butchery to me. Ticks over fine at 30psi so it can't be far wrong, specially since there are no gaskets in it yet. Cheers, Andy
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Post by baggo on Jan 29, 2008 1:00:02 GMT
Hi Andy,
another possibility is that the quartering is very slightly out on one axle. Try the eccentric bush trick first though.
John
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Post by Shawki Shlemon on Jan 29, 2008 7:36:56 GMT
If the coupling rod/s or quartering are the cause , turn wheels by hand until you get to the tight spot , with a feeler gauge check all axle boxes and find which face on which one is in contact and slightly clean/file that face and I mean a few thous , recheck . If it is running on 30 psi ,it seems to me is OK . If it is excessive then the off set bush trick is the alternative .Hope this may help .
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paul
Member
Posts: 8
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Post by paul on Jan 29, 2008 21:33:13 GMT
Come on Andy, where's the video (or at least the pictures!)
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Post by AndrewP on Jan 30, 2008 21:58:07 GMT
Sorry Paul, it's in bits again. I don't think blurred pictures of Baker valve gear would be particularly informative anyway and video is beyond my abilities. Actually that's not strictly true, I could video it but none of the computers here have a slot that accepts the tape out of the camera Note to self, must research getting video into 'puter. Anyway having broken the reversing lever top off I've been side tracked by building an engine stand - lots of holes in B&Q angle and some old 1" square from a market stall (don't ask) so far - get the welder out tomorrow. Discovered Juliet is only 1 1/2" shorter than Rob Roy so one stand may do for both - that cheered me up. Cheers, Andy
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paul
Member
Posts: 8
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Post by paul on Jan 31, 2008 8:51:38 GMT
Note to self, must research getting video into 'puter. For quick little clips I use me digital camera -> USB. Resolution ain't great and sound is a bit dodgy but it does the job quickly - most of these clips were done this way... www.artefact-rescue.co.uk/albums/Steam%20&%20Rail%20Videos/index.htmlBack on topic.... you mean it won't run on an aquarium pump?!!
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Post by ianengr on Feb 1, 2008 5:03:03 GMT
Hello Andrew, You may find the "tight spots" are a little Exhaust compression, this will tend to show up more with air than steam.
Regards,
Ian.
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