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Post by krmckay "Bombs away" on Jul 1, 2019 20:08:49 GMT -4
Bought my first gas engine a few weeks ago, a NGH GT9, it is a direct form / fit replacement for my ASP 52 Glow engine. The engine bolted directly into the existing hole in the engine mount, even the mufflers are have the same bolt on pattern. Finally got the engine running after playing with adjustments all day. After the first 1/2 an hour I broke down and read the instructions (MISTAKE) the Chinlish was terrible. no setting for high or low throttle adjustments, just measurements on how many 'mm' the throttle position opening in the carb had to be. Went online and downloaded direct from the company (same thing). finally noticed on the fuel tank installation diagram found what I needed and got it running in minutes. I've now run 1/8th of a 8oz tank of gas thru the engine at recommended RPM for break in, still need more run in time and have to fine tune the top and bottom end adjustments. Thank God for my Futaba 7C radio and all the sub-menus and settings, etc. It would have been extremely hard to manually get the throw adjustments for the throttle right without all those features.
The trainer (Eagle II) should be maidened and ready for the Fun Fly Mid month. Weather permitting over the next two weekends.
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Post by krmckay "Bombs away" on Jul 1, 2019 20:13:21 GMT -4
Here is what I was dealing with see the attached PDF. Look at the lower right side of the diagram and by the way the word "Rings" = 'Turns'
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Post by krmckay "Bombs away" on Aug 26, 2019 13:51:07 GMT -4
Well for those at the field this past Sunday you know my gas engine on the trainer refused to start. it ran briefly for a few seconds and when I closed the throttle back to idle it stopped, I now know why after taking the whole engine out of the plane I disassembled the backplate and removed the cylinder head only to find pits in the cylinder head upon removing the cylinder liner I found my problem. The piston wrist pin retaining ring had snapped and jammed the piston, cutting off pieces and embedding those pieces of the retaining ring into the cylinder head and cracking the cylinder liner. In order for this to run again I'll need a new piston, piston ring, back-plate gasket and cylinder liner and of course a new retaining ring for the wrist pin. All parts are not expensive except not a single piece is in stock at Hobby King. Every piece is back-ordered with no estimate of restocking time.
So since this engine carries a one year warranty it looks like I'll have to get a RMA number and return the engine. So I'll be putting the Glow engine back into the plane in order to fly it this season.
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Post by krmckay "Bombs away" on Aug 26, 2019 19:48:41 GMT -4
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Post by krmckay "Bombs away" on Aug 27, 2019 18:58:51 GMT -4
replacement parts ordered from China ( Not Hobby King) and should be here in 3-4 weeks. It was cheaper to repair than the return cost for warranty.
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ET
Silver Member
Posts: 64
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Post by ET on Aug 28, 2019 6:33:18 GMT -4
That really sucks. At least you are getting the spare parts and will fly again with that engine.
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Post by krmckay "Bombs away" on Aug 28, 2019 6:48:16 GMT -4
That really sucks. At least you are getting the spare parts and will fly again with that engine. All because the retaining 'G' clip broke and a piece got fowled between the piston and liner. At least now, I'll be putting it back together and know the clip is installed correctly.
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Post by krmckay "Bombs away" on Sept 11, 2019 17:11:11 GMT -4
Replacement parts arrived today and 20 mins later the engine was back together pre-oiled and ready to be bench mounted and broken in again. The Piston was a much improved version but has two retaining clips for the wrist pin vise the original piston that had only one. Twice the chance this will happen again but at least I know they are properly installed and seated in their groove.
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Post by krmckay "Bombs away" on Sept 12, 2019 20:47:03 GMT -4
Mounted engine on test stand today and filled the fuel tank with gas, primed the fuel line and with a single turn of the electric starter the engine roared back to life. ran about 1/4 tank of fuel thru the engine until the screws securing it to the mount started to back off and I had to shut it down. it is now ready for transplant back into the trainer. but that will have to wait until next week as I will be busy with the fall fair at Shearwater over the next few days.
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