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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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 Posted: Wed Dec 01, 2010 10:19 am Post subject: FYI -- Rotax Info to help the owner |
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FYI
My 912S does not start, what’s going on?
All of the Rotax 9 series engines are known to start quickly and readily. (Many people report their engines start within 1 revolution of the crank).
The 912S/ULS is a high compression engine and that can cause the engine to move (shake) in the engine mounts if the engine mount is not strong enough. Many 912S installations are designed for the lower compression 912UL engine and are not “beefed up” when the 912S is installed. This is the root cause of many 912S starting/operating issues and must be cured before proceeding with any other actions.
Here are the factors related to hard starting:
Engine shaking during the start cycle. This causes the fuel in the carbs to froth and spill into the venture and/or the vent lines. With the fuel system disrupted the engine cannot start.
Carb shaking; even with a proper engine mount you can still have carb shaking problems. The best solution is installing the Rotax 912S airbox as it rigidly fixes the carbs, preventing most shaking. A side benefit is that SB-912-030 (inspection of the carb flanges) is not applicable with the airbox installed.
Loose gearbox; If the gearbox is allowed to lose its spring pressure (see Gearbox related FACs) the engine will not want to start as the prop will be fighting the compression strokes. Basically the engine gets into a cycle of kicking back and forth between the compression/ignition pulses and the prop forces hitting the dogs in the gearbox. Remove and send your gearbox for re-shimming of the springs.
Tips for hard starting in cold weather:
• Increase starting jet size to allow more fuel. (SI-03-9 It may be necessary to switch back to small jets in warmer weather.
• Modify choke rotary disc (SI-03-9
• Reduce spark plug gap to minimum.
• Make sure you have a good battery. Does jump starting help? If it does you may want to change batteries.
• Battery wire size, connections and grounds. Check for voltage drop between battery and starter.
• Preheat is always a good idea. Avoid rapid methods that can damage your aircraft.
• Check to see if the choke is full on and both are equal. Proper set up of the cables is critical.
| | - The Matronics RotaxEngines-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Last edited by Roger Lee on Wed Dec 01, 2010 11:00 am; edited 1 time in total |
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Wed Dec 01, 2010 10:34 am Post subject: Coolant flow route |
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FYI
Coolant flow route
| | - The Matronics RotaxEngines-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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Coolant flow route.pdf |
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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056 |
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Wed Dec 01, 2010 10:37 am Post subject: Oil Flow Route |
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FYI
Oil Flow Route
| | - The Matronics RotaxEngines-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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Oil Flow Route.pdf |
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223 Time(s) |
_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056 |
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Wed Dec 01, 2010 10:56 am Post subject: maintenance Documentation |
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FYI
Here is something to help you maintain your high tech engine and keep your re-sale value up.
| | - The Matronics RotaxEngines-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RotaxEngines-List |
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| Description: |
| Maintenance Documentation |
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Maintenance Schedules.pdf |
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20.71 KB |
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241 Time(s) |
_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Last edited by Roger Lee on Wed Dec 01, 2010 11:00 am; edited 1 time in total |
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Wed Dec 01, 2010 10:58 am Post subject: Rotax 912 Maint. Inspection Check List |
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Here is the Rotax Maint. 912 inspection check list. Use it, it will keep you safe and keep your re-sale value up.
| | - The Matronics RotaxEngines-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RotaxEngines-List |
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| Description: |
| 912 Inspection Check List |
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Download |
| Filename: |
Inspection Check List.pdf |
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71.58 KB |
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301 Time(s) |
_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056 |
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