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 Posted - December 08 2013 : 11:42:32 PM
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I forget which post it was, but I decided to order those o-rings someone mentioned. Got them Friday, and just did surgery Sunday evening on a GP-20 diesel. The o-rings are much smaller, and larger diameter. In order to even try to get them over the wheels would require removal of the side truck frame. So, I stole a pair of used 'tires off another MU-2, a Santa Fe F9 with cracked wheels, and they went on easily without having to remove the side frames. BElow are pictures of the differences and installation. So I'd say unless you're desperate I wouldn't use these fuel injection o-rings.
  
The engine moves much easier with Traction tires installed, both were missing from the PC engine at the time. One more Tyco back online again. 
Jerry
" When life throws you bananas...it's easy to slip up"
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Posted - December 09 2013 : 12:07:50 AM
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Hmmm, those O-rings are a lot bigger than the ones that came in the box I got with that part number. The ones in the picture look like the ones that I needed for the car job. I wonder if I got the correct part number for my car but someone put the wrong O-rings in the box? Looks like I need to check this out.
Randy
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Posted - December 09 2013 : 04:08:46 AM
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So how are the fuel injector rings? I've used number 5 ( I think ) 0-rings.
" Heck with counting 'em rivets, TRAINS ARE FOR FUN! Not called the Mad Scientist for nothing either!"
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Posted - December 10 2013 : 12:49:22 AM
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Tonight I undertook to rework an MU-2 motor assembly, so here's how it came down - I wanted to use the axles off the plastic MU-2 motor, but there is a difference in axle size. Puttering around with it, I got brave and pulled the plastic wheels off the axles - so far, so good. I then pulled off the old split ones off the old axles. The plastic MU-2 axle wheels have a smaller diameter opening, so wouldn't press on the older axle shaft. Hmm. Got to looking around, and pulled down my Dremel super-accessory kit, which I rarely use. I spotted the cylindrical reaming tool, not the ball end tool, and pulled it out. Casually, I stuck it in the old MU-2 wheels...dang, a near-perfect fit! Just slightly undersized, what I want, by a red hair.  I then tried it on the plastic MU-2 wheels, wouldn't go, so I carefully started reaming them by hand at first. Definitely doin' the job! So, I got brave, and stuck it in my 5-speed dremel, and found a deep washer to lay the wheel on. Turning it on as low as I could and keeping it eyeball-straight, I reamed the first one out with a quick in-and-out motion. cleaned it up with an Xact-0 blade, then the test - will it fit? YES!  WOO-HOO! I had to press really hard to get it on, but it's on GOOD, and rolled straight <whew!>. Grabbed the other, and did the same, same results.  So now I can use the old axles with the correct gears, no play in the axle in the housing, and with the newer flat traction tire design, it ought to pull ok. I held the whole MU-2 assembly together with one hand, and held two power leads to the motor connections - we have movement! So then I had to go upstairs to find my tap, as I decided to tap the two rivet shaft holes for 4-40. The hole is slightly oversize, but since I cut threads the whole length, I don't think it will pull out, from my initial tests. This rebuild is going by quickly! The guy whose Tyco F9A Penn Central I'm rebuilding it for will be happy to get his childhood diesel back in working order, albeit not in original condition, but nicely upgraded somewhat, and easier to do maintenance on with the screws rather than the rivets. So Tuesday night I will take pictures of the whole shebang-alang-a-ding-dong, and post it here. Getting late, and time to retire. I made great progress, and can't wait to send the guy a video of his engine running around my test track Wish I could find more of those plastic MU-2 units now! Those wheels are fantastic for reuse. I will be looking for those at train shows now. Anyway, time to put down the sewing needle and retire this thread for the night....droppin' steam now.
Jerry
" When life throws you bananas...it's easy to slip up"
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Posted - December 12 2013 : 7:14:13 PM
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Where are the pictures?
Edited by - thetramp on December 12 2013 7:14:58 PM
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Posted - December 12 2013 : 10:21:36 PM
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quote:Where are the pictures?
Originally posted by thetramp - December 12 2013 : 7:14:13 PM
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http://www.tycoforums.com/tyco/forum/topic.asp?TOPIC_ID=14089#73519
http://tycodepot.com/
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Posted - December 13 2013 : 8:16:32 PM
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quote:
Yeah, I kinda posted them in another area. What JNXT said... Link
Jerry
" When life throws you bananas...it's easy to slip up"
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Posted - December 13 2013 : 8:29:47 PM
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But, here's some pictures in THIS thread as well.
   
The newer plastic MU-2 was a great traction wheel donor, I wish I had more of those to cannibalize!
I contacted an O-ring supplier online this week, and found a source for 1/2 inch skinny MU-2 type O-rings (actual quoted dimensions .462 inch ID by .040 inch cross-section), but they want .88 cents each, minimum 100 quantity, and I have no idea if they'll work or not yet, couldn't get a sample. So that'd be an $88 gamble. I measured 11 mm ID and 1 mm cross-section. they're probably close. Just not sure I want to risk 88 bucks on this. Wish I knew what the original specs were for them.
Jerry
" When life throws you bananas...it's easy to slip up"
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