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HelicopterEngines Plugs Mufflers Fuel › Worth rebuilding?
12-02-2005 09:18 PM  12 years agoPost 1
Wazowski

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Portland, Oregon USA

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Well I finally did my first succcessful auto but it was a forced one. I have been running my Raptor with the stock TT39...had it really running sweet, but I had just switched to 20% nitro fuel. After making a few minor high needle adjustments (had gone lean with the new fuel or so it seemed) I was making a few FF passes and was heading back to the pits when I experienced a suddend loss of power. I managed to get stablized and hit the throtlle hold for a fairly in control auto (only one bounce!). I just knew she had over heated but checked the back plate and all was well! I noted lots of smoke before the problem occured so....what the hey? When I got back to the pits I tried to restart but she turned over 270 deg. and seized. I just knew I burned it up. I tore it down at home and found pieces of the back bearing cage throughout. A piece had gone up the intake and wedged itself between the piston and sleeve jamming the ring in the proccess. A new piston and ring fron Heliproz is $37 and a bearing set is another $19. This may seem like a dumb question but is the TT39 worth rebuilding? It would cost $140 to replace with anything else. What say you all?
Wazowski

Any sufficiently advance technology is indistinguishable from magic

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12-02-2005 09:22 PM  12 years agoPost 2
DOKEY

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Northamptonshire UK

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You do not mention the liner only the piston and ring, I would also change the liner if it was me, as well as.

Ryan.

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12-02-2005 09:23 PM  12 years agoPost 3
BarracudaHockey

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Jacksonville FL

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Save yourself the trouble and get an os37

Andy
AMA 77227
http://www.jaxrc.com

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12-02-2005 09:30 PM  12 years agoPost 4
Wazowski

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Portland, Oregon USA

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DOKEY...the liner is so hard...I could not see or feel any damage to it but your suggetion is noted, Thanx!

Any sufficiently advance technology is indistinguishable from magic

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12-02-2005 09:34 PM  12 years agoPost 5
Wazowski

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Portland, Oregon USA

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barracudahockey, It may be more trouble than I know to try and rebuild the 39. When I pulled it apart and all the bearings fell out I was unable to get the bearing race out even after heating the casing. It's a press fit but with no pry point or anyplace to knock it out I may be out of luck...Thanx, I'll consider the OS37 if this proves troublesome. On the other hand if anyone out there knows how to get the bearing race out I'd sure appreciate knowing!

Any sufficiently advance technology is indistinguishable from magic

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12-03-2005 01:32 AM  12 years agoPost 6
crowfly

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Pleasant View, TN U.S.A.

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Heat it in the oven again to about 300°f.. This time, as soon as you get it out of the oven,,,, slam it down onto a 2X4 or cutting board or something similar. Get it HOT & slam it FAST & HARD.

ps Slam it with the rear cover opening down against the board. The engine block will stop, the bearing race will not.

If God had meant for man to fly, he would have given him more money

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12-03-2005 06:27 PM  12 years agoPost 7
Wazowski

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Portland, Oregon USA

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Thanx crowfly...that worked! I guess I'll bebuild and give the TT one more chance...I had it running so well...musta got a good one!

Any sufficiently advance technology is indistinguishable from magic

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12-03-2005 06:36 PM  12 years agoPost 8
crowfly

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Pleasant View, TN U.S.A.

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I really like these ceramic bearings.

http://www.mcintoshcentral.com/rc-b...2f21ad47b2bc909

If God had meant for man to fly, he would have given him more money

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12-03-2005 08:29 PM  12 years agoPost 9
BarracudaHockey

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Jacksonville FL

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http://www.rc-bearings.com ceramics for under 30 bucks.

edit: nevermind its the same site.

Andy
AMA 77227
http://www.jaxrc.com

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HelicopterEngines Plugs Mufflers Fuel › Worth rebuilding?
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