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12-23-2014, 07:45 PM
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Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 2,820
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Do a good ROTAX pre-install inspection
One thing that surprised me when I installed my ROTAX 3 years ago was that not all the items designed to be safety wired were in fact wired, and my manifold pressure hose did not have a hose clamp where it attached to the balance tube. It seemed tight so I left it as is. Today (after 250 hours on the tach) while fixing an EGT probe connector I found the sensor hose had slipped off the balance tube nipple (which may explain some performance degradation).
Pretty simple stuff and I feel a little naive, but I wanted to post because some builders might make the same mistake I did in assuming the factory would have every safety wire and clamp in place. Be a skeptic!
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12-23-2014, 08:29 PM
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Join Date: Jan 2014
Location: IA
Posts: 56
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As I recall the plans call out for zip tie it to the over head coolant bottle supply line only, I think for flying 12's when check the carbs for every 25 hrs check something etc to be on safe side 
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12-23-2014, 10:44 PM
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Join Date: Feb 2010
Location: Perth, Western Australia
Posts: 1,647
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There's also the mag plug, which should be safety wired. Some also put a clamp on the oil filter and safety wire that, although I've been told it's not necessary if it has been properly installed.
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rgmwa
RV-12LR 912ULS
120346
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12-24-2014, 11:02 PM
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Join Date: Nov 2009
Location: Independence, OR
Posts: 316
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I have 400 hours on my 912ULS powered CT and the oil filter has never budged. I don't know of any that have.
__________________
John Horn (donated for 2020)
Independence, OR
LSRM-A, CFII
Rotax Service, Maintenance, and Heavy Maintenance Trained
Building an RV-12, N7878H reserved
Flying a Flight Design CTSW
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12-27-2014, 07:50 AM
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Join Date: Oct 2014
Location: Marysvale, UT
Posts: 53
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An engine from Rota needs to have the oil magnetic plug and the oil pressure regulator plug safety wired. It does not come from Rotax that way and most aircraft MFG's don't do it. If the oil filter is installed properly it WILL not come off. The only ones to have ever done that was because it wasn't installed properly. If you can take it off with just your hand it may be too loose.
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12-27-2014, 09:55 AM
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Join Date: Oct 2012
Posts: 421
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Quote:
Originally Posted by RFSchaller
One thing that surprised me when I installed my ROTAX 3 years ago was that not all the items designed to be safety wired were in fact wired, and my manifold pressure hose did not have a hose clamp where it attached to the balance tube. It seemed tight so I left it as is. Today (after 250 hours on the tach) while fixing an EGT probe connector I found the sensor hose had slipped off the balance tube nipple (which may explain some performance degradation).
Pretty simple stuff and I feel a little naive, but I wanted to post because some builders might make the same mistake I did in assuming the factory would have every safety wire and clamp in place. Be a skeptic!
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The KAI says that did not have to be wired if I recall correctly, I remember throwing a good tie wrap on it anyway. One of my AP buddies suggested pretending I was engine vibrating for 1000 hours and anything near it that can become loose should be wired or secured with a clamp, and anything that rubs needs to protected against rubbing.
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12-28-2014, 10:23 AM
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Join Date: Dec 2011
Location: Hackettstown, NJ
Posts: 459
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Hoses, zip ties and safety wire
I'm just wrapping up my first annual. Just prior I completed several of the fuel tank upgrades, canopy latch switch install, ADAHRS stiffener, misc other service bulletins so its taken several weeks. (I do need to move my annual schedule to a warmer month)
On advise from DAR last year I added multiple zip ties and RTV sealant in and around the Rotax coolant, fuel and oil hoses. While Van's had identified a few of these spots in previous updates he had seen and maintained a earlier built 12 and was familiar of a few places that has show some wear from vibration. While I removed several of the zip ties to complete the inspection/check fasteners etc..., I could not find any signs of hose wear. Only minor engine compartment issue has been the lower right cowl hinge pin which keeps riding up due to engine vibration. Added safety wire to hold it to the firewall stiffener. There are a lot hoses on the Rotax and I'd recommend securing them in as many places as possible. Zip ties/RTV are cheap.
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12-28-2014, 03:26 PM
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Join Date: Sep 2006
Location: Windsor, California
Posts: 924
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Funny about that "lower right cowl hinge pin" vibrating up -- mine does the exact same thing. All the other pins seem happy to remain in place. I added a little clip at the top of the "lower right cowl hinge pin" to keep it properly corralled. Must be some unique vibe thing going on down there! 
__________________
David Heal - Windsor, CA (near Santa Rosa)
EAA #23982 (circa 1965) - EAA Technical Counselor and Flight Advisor; CFI - A&I
RV-12 E-LSA #120496 (SV w/ AP and ADS-B 2020) - N124DH flying since March 2014 - 940+ hours (as of September 2020)! 
V AF donation through June 2021.
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12-28-2014, 05:37 PM
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Join Date: Dec 2008
Location: Lacey, WA
Posts: 1,365
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Lower right cowl pin
Here is one more idea to secure the lower right cowl pin from floating up. Make a new pin with the top bent as shown so it can be rotated and hooked under the bottom of the oil tank bracket:
If the top right cowl pin wants to vibrate up, just make it longer. Then once the top cowl is on it can't come up:
P.S. I may have posted these pics before in another thread, if so please forgive the duplication.
__________________
Tony
E-LSA RV-12 ULS
Last edited by Tony_T : 12-28-2014 at 05:45 PM.
Reason: Added a P.S.
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12-28-2014, 08:13 PM
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Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 2,820
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I have no idea why, but my upper and lower cowl pins stay put.
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