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Home✈️Aircraft🚁HelicopterHIROBOOther › Glow plug issues
11-26-2018 08:01 AM  10 months ago
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Hirobo aus

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Queensland, Australia

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Glow plug issues
Hi all. So, went flying this past weekend, went through roughly 5 tanks of fuel on my SDX 50, and ended up going through 2 glow plugs in 2 days (OS #8). After each tank of fuel, I removed the plug and found that there was a fair amount of black "stuff" on the element. Removed it with a small flat tip screwdriver, re-flew, and the same thing again. Can't quite work out the issue. I'm running an OS 50 SX-H. Fuel mix is 25% nitro, 20% oil (Klotz 198), and the remainder is methanol. I have the needle on the carb dialled out at 1.5 turns. Any hints would be great. Am I running too lean, too rich??? I've never had this issue before, so I'm kind of at a loss.
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11-26-2018 10:35 AM  10 months ago
dgoss999

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UK - Lancashire

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Possibly caused by a Crank Bearing failing..

Are the bearings rough or noisy when the crank is turned by hand??

DG
"Believe none of what you hear, and only half of what you see." • Benjamin Franklin
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11-26-2018 11:09 AM  10 months ago
fastflyer20

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N. Tonawanda, NY

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I agree, typically it’s due to the crankshaft bearings needing to be replaced.Tom
CAUTION - my posts are based on my experiences, yours may be different.
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11-26-2018 12:52 PM  10 months ago
ICUR1-2

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Ottawa, Ontario

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How many shims are you using?
Are you sure it's not metal?
Possibly bad fuel?

Too many shims would do it.
spending time, paying attention
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11-26-2018 01:41 PM  10 months ago
wjvail

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Meridian, Mississippi

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https://rc.runryder.com/t821734p2/

A deposit on the element is not at all uncommon. Almost all engines and fuel do the same thing. Above is a similar thread. In that thread the OP was using a unique oil but much of what was discussed is typical for all fuels.
"Well, nothing bad can happen now."
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11-28-2018 09:04 AM  10 months ago
Hirobo aus

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Queensland, Australia

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Hi all. Thanks for the tips. Turns out it is the rear crank bearing starting to fall apart. Front bearing is still ok, but will replace both at the same time.
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11-28-2018 09:47 AM  10 months ago
dgoss999

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UK - Lancashire

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Good you caught it early and the plug didn't disintegrate in flight!

DG
"Believe none of what you hear, and only half of what you see." • Benjamin Franklin
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11-28-2018 10:25 AM  10 months ago
Hirobo aus

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Queensland, Australia

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Good thing indeed..... Had a similar thing happen to me years ago running a Thunder Tiger redline heli engine. Two great lessons that day -
1. Avoid TT redline engines (weren't that reliable).
2. Don't ever pay off auto-rotation practice!!
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12-07-2018 11:37 PM  10 months ago
wjvail

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Meridian, Mississippi

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Have you replaced your bearing? Has it solved your issue?"Well, nothing bad can happen now."
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