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03-11-2003 03:59 AM  14 years agoPost 1
gwallace1

rrVeteran

Susanville, CA

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Ok I posted this in the engine section, but was hoping someone here might shed some more light on the subject:

I was flying my Hawk IV today doing climbouts and at about 60 ft the engine just stopped without any warning. I autoed straight down, a little hard but only cracked a landing strut, which is only the second auto I have ever done, the last was a t/r failure with pirouetting auto, but never on purpose. Thanks G2!!! No other damage what so ever, thankfully because I just put on new 550 glass blades.
Well I tore the engine down which only has two gallons of Byron 15% with 20% synthetic through it and six months old, and found the rod end (crank end) was completely gone. There was a ton of aluminum shavings from it and the crankcase was scored really bad. All bearings were still smooth, but I have no idea what caused this. I am not running lean, main needle out 1 1/2 turns, low needle at factory. Has anyone had this happen? It is still under warranty and I sent it off today. How is hobby services on these, and what can I expect for a turnaround time?

Also...The carb is just about at the factory setting, maybe three clicks to the lean side, no more and the mixture control screw has not been touched.... The cylinder was not scored, just around the crank from where the broken rod peices got chewed up. The cylinder looks brand new, not a mark on it, piston is clean and not discolored or pitted and the glow plug is not burnt white. Other than the rod falling apart the rest looks perfect. I am running a bit more rich than anyone else I have flown with. They keep telling me it is time to lean it out.... . Either way as long as the engine will be replaced or repaired I will be happy

Greg

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03-11-2003 06:43 AM  14 years agoPost 2
heliman100

rrApprentice

CLOVIS CALIF

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hobby services turnaround

i live in california ,and it took about 10 days last time i sent a motor in to get it back,pretty fast i thought.

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03-11-2003 05:12 PM  14 years agoPost 3
gwallace1

rrVeteran

Susanville, CA

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Thanks. Glad I am working a ton the next week & a half, I won't miss it as much!!

Greg

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03-11-2003 06:37 PM  14 years agoPost 4
Lift

rrElite Veteran

Houston, TX

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Greg,
They usually have a 2 week turnaround. But, I have a question. When you installed the fan how did you get the crankshaft locked in place so you could tighten the fan nut?

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03-11-2003 07:13 PM  14 years agoPost 5
gwallace1

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Susanville, CA

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The kit was originally purchased as an arf, so I have never touched it. The engine, clutch and fan were already installed. But when it comes back what is the best way to install the fan & clutch? I do not have a piston locking tool and do not want to screw it up. Also the Hawk directions state to use red loctite on the clutch threads prior to installing, but when I took it off it came off much easier than if red had been used. Are there any alignment issues or other I shouild be concerned withwhen putting the engine back in?? Any help would be appreciated.

On the bright side I am getting in that autorotation practice that I am too afraid to do!!! This makes two forced autos in three weeks, both with ok outcomes.....other than a trashed engine

Greg

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03-11-2003 08:23 PM  14 years agoPost 6
Tron

rrApprentice

Morgan Hill, CA

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if you got the clutch and fan off the engine crankshaft, you must have found a way to lock the crankshaft in order to take them off.

Well, w/o a piston lock tool, you can do one of two things:

1. remove the backplate and jam a plastic handle toothbrush to prevent the engine from turning. Now you can tighten what you need to the crankshaft.

2. Same idea as 1. but now remove the carb instead and jam that toothbrush in the crankshaft to keep it from turning as you tighten down.

As far as alignment, that is one of the benefits of the "dark side" design. You don't need to worry as it is self aligning when assembled.

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03-11-2003 08:27 PM  14 years agoPost 7
Lift

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Houston, TX

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Yup, Tron is DEAD SPOT ON! Read up....

Let me add that IMHO anything you use to jam or lock the piston is taboo for a glow motor. I know that there are those that will say "I have been doing it for years...." but it's not a good idea. You put ALOT of pressure on the crankshaft wrist pin and can cause a slight bend to it or even break it off. Either way the engine is toast!

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03-11-2003 08:41 PM  14 years agoPost 8
gwallace1

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Susanville, CA

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Thanks to both for the info. When I pulled the fan I opened the backplate and used a toothbrush to block the crankshaft. Looks like I will do the same to reinstall it. I'll let you know how it goes once I get an engine back.

Greg

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03-11-2003 09:01 PM  14 years agoPost 9
jimmyhua

rrVeteran

Guam

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You put ALOT of pressure on the crankshaft wrist pin and can cause a slight bend to it or even break it off.

Based on the latest greatest pictures here on RR, I wouldn't worry about the wristpin so much as the thin piston head itself!!!

Jimmy

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