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08-08-2016, 07:19 AM
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Join Date: Apr 2010
Location: Covid Country-SoCal
Posts: 1,081
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Is the failure the mounting bolts to the engine, or the assembly bolts that hold the starter together? I wish I had heard of this last week before I changed my oil.
-Marc
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RV-10
N814RV
2020 Donation Made
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08-08-2016, 07:30 AM
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Join Date: Feb 2008
Location: Largo, FL
Posts: 1,027
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Assembly bolts
the ones that hold the drive motor to the gear box on the starter.
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RV-10 Co-built, maintained, flown (sold)
RV-8A Maintained and flown (Sold)
RV-6A Bought and Flying (N177RV), upgrades $$$
IO360, 180HP/CS, AFS 5600T, D10A, G650, G430, G327, ADS-B, VIZ385 AP
Very Happy Contributor
Comm, SMEL, CFII, A&P
Based at KCLW (Clearwater, FL)
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08-08-2016, 07:45 AM
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Join Date: May 2006
Location: Houston
Posts: 2,010
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I have found various fasteners loose on my Skytech starters over the years. Always addressed with thread locking compound. They have never recurred.
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Bryan
Houston
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08-08-2016, 08:13 AM
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Join Date: Sep 2007
Location: Central IL
Posts: 5,514
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Short M5 bolts?
Do you mean the short M5 bolts - D in this image?
Some background for your solution. Read this : http://www.hexagon.de/rs/engineering%20fundamentals.pdf
Edit:
Quote:
Originally Posted by Low Pass
I have found various fasteners loose on my Skytech starters over the years. Always addressed with thread locking compound. They have never recurred.
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Likely due to the lubrication of the threads resulting in higher applied tension (see reference above). Excellent data leading to a durable solution - it says, the bolt and threads are strong enough. It might be enough just lube the threads for torquing, maybe a clue for SkyTec engineers. Locking does not hurt though.
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Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
Last edited by BillL : 08-08-2016 at 09:36 AM.
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08-08-2016, 09:06 AM
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Join Date: Oct 2005
Location: 08A
Posts: 9,476
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Quote:
Originally Posted by BillL
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Bill, The Master of Understatement 
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Dan Horton
RV-8 SS
Barrett IO-390
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08-08-2016, 09:28 AM
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Join Date: Oct 2007
Location: Sacramento, CA
Posts: 3,343
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Does any one has a picture of these bolts? Since Skytech replaced my first starter under warranty, I have not had any issues with mine and have been checking the two long bolts that hold the case together with no looseness. It has been over 500 hours since mine was replaced.
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Mehrdad
N825SM RV7A - IO360M1B - SOLD
N825MS RV14A - IO390 - Flying
Dues paid
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08-08-2016, 10:35 AM
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Join Date: Feb 2008
Location: Largo, FL
Posts: 1,027
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Skytec has a new one on the way
My buddy talked with Skytec and they have shipped a new unit. Good for them. Always great service! But, this will be the second replacement, for the same problem. We will inspect it at the next oil change (and subsequent).
I will take a look at the old one, before we ship it back, and determine if I can put a bushing in the motor flange bolt hole, to take up the extra space. If so, we will do the mod on the new starter, before we install it.
Ron
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RV-10 Co-built, maintained, flown (sold)
RV-8A Maintained and flown (Sold)
RV-6A Bought and Flying (N177RV), upgrades $$$
IO360, 180HP/CS, AFS 5600T, D10A, G650, G430, G327, ADS-B, VIZ385 AP
Very Happy Contributor
Comm, SMEL, CFII, A&P
Based at KCLW (Clearwater, FL)
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08-08-2016, 12:52 PM
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Join Date: Sep 2007
Location: Central IL
Posts: 5,514
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This is a funny thread, I had a Saturn . . . my daughter had a Saturn, and it developed a large rust hole under threshold plate on the sill under the left side back door. She found it just 2 months past the 8 year rust through warranty, the service manager said - "I'm sorry your warranty has expired . . . . we have never seen that before. "
I went directly to parts (100 ft away), the parts guy said -yeah it happens all the time, we have a special kit for that. Yeah, funny. Ever so happy to sell that car. I wonder that happened to that company 
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Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
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08-08-2016, 01:06 PM
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Join Date: May 2006
Location: Houston
Posts: 2,010
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Even with 2, maybe 3 occurrences of finding a loose fastener on my Sky-Tecs in 1839 hours and 16 years, I am *really* glad I wasn't hauling around one of those ~15-20-lb Prestolite starters.
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Bryan
Houston
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08-09-2016, 08:38 AM
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Join Date: Jan 2005
Location: KPYM
Posts: 2,686
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My SkyTec NL starter did the same thing. That is why I replaced it with a B and C.
The two cheeseball metric M5 bolts that hold the starter motor to the drive stretch, bend and deform. I was replacing them all the time and finally got rid of it to Mike Bullock to deal with!
Good luck Mikey!!! 
CJ
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RV-7 Flying - 1,200 Hours in 5 Years!
The experiment works!
TMX-IO-360, G3i ignition & G3X with VP-X
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