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kitfoxsport(at)verizon.ne
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 Posted: Fri Dec 11, 2009 6:27 pm Post subject: 914 Intake valve stuck? |
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The motor has sat for awhile; okay a long while. It was suppose to have had bearings and piston rings replaced but everything else was within spec. I noticed when I hand propped the engine just for oil purging that I had a little drag at one point but could not figure it out. Now two engines run later with the first for a very short time to check everything and then a run for 10 minutes. Today I almost could not turn the prop by hand because of an intake valve was stuck or it just would hardly move. I removed the air intake to the offending valve and sprayed everything in my garage to loosen it up. Finally it works some what free. Any thoughts?
George
Sport Model(7+)- Rotax 914- almost, but not yet!
do not archive
[quote][b]
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Sat Dec 12, 2009 5:17 am Post subject: Re: 914 Intake valve stuck? |
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How many hours on the engine and do you use 100LL? If it sat a real long time and oil purge would be a really good idea.
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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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kitfoxsport(at)verizon.ne
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| Posted: Sat Dec 12, 2009 9:38 am Post subject: 914 Intake valve stuck? |
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Roger,
I have no idea how many hours are on this engine. That is why I believe the guy I picked the motor up from had the lower end checked and replaced the bearings and put in new piston rings. He claims he did not touch the valves because the appeared okay. I didn't know about the part of not doing the valves until recently. And yes, I would say it has burned 100LL a good portion of its life. I had sitting in my garage for at least 1 year and yes I did purge the oil system. During hand prop to purge the system is when I first heard the faint popping and a little resistance. It was after two run-ups and then two days of sitting that I went to rotate the prop that I found it very difficult to rotate. I should note I checked valve clearance after the second warm up and nothing seemed wrong with offending intake valve. As I said I sprayed some LPS directly to the valve stem through the removed intake pipe and it helped it free it up but still not perfect. What do you think? Major or put a little lube in the gas for a while.
George
Sport Model(7+)- Rotax 914- almost, but not yet!
do not archive
From: Roger Lee <ssadiver1(at)yahoo.com>
To: rotaxengines-list(at)matronics.com
Sent: Sat, December 12, 2009 5:17:09 AM
Subject: Re: 914 Intake valve stuck?
--> RotaxEngines-List message posted by: "Roger Lee" <ssadiver1(at)yahoo.com (ssadiver1(at)yahoo.com)>
How many hours on the engine and do you use 100LL? If it sat a real long time and oil purge would be a really good idea.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center
520-574-1080
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=277290#277290www.homebuilthelp.com
[quote][b]
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Sat Dec 12, 2009 4:00 pm Post subject: Re: 914 Intake valve stuck? |
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Some of these 914's have been military surplus. It is what is used in the Predator aircraft. If I bought a used 914 it would help to get a history on the engine.
If it has had a long life of 100LL then it probably needs a valve job and have the seats reamed. You can not do a valve job like a car. The valves are armored. (too hard). Valves need replacement, the seats can be re-worked.
Have you done a compression test. This may tell a more complete story. Do a compression test first thing and at operating temps.
All this said this can be hard to diagnose over email.
| | - 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 |
|
_________________
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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kitfoxsport(at)verizon.ne
Guest
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| Posted: Sun Dec 13, 2009 11:45 am Post subject: 914 Intake valve stuck? |
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Roger,
I pulled the head last night because the valve was still sticking. I will take valves apart later. Thank!
George
Sport Model(7+)- Rotax 914- almost, but not yet!
do not archive
From: Roger Lee <ssadiver1(at)yahoo.com>
To: rotaxengines-list(at)matronics.com
Sent: Sat, December 12, 2009 4:00:29 PM
Subject: Re: 914 Intake valve stuck?
--> RotaxEngines-List message posted by: "Roger Lee" <ssadiver1(at)yahoo.com (ssadiver1(at)yahoo.com)>
Some of these 914's have been military surplus. It is what is used in the Predator aircraft. If I bought a used 914 it would help to get a history on the engine.
If it has had a long life of 100LL then it probably needs a valve job and have the seats reamed. You can not do a valve job like a car. The valves are armored. (too hard). Valves need replacement, the seats can be re-worked.
Have you done a compression test. This may tell a more complete story.
All this said this can be hard to diagnose over email.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center
520-574-1080
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=277365#277365
www.homebuilthelp.com
[quote][b]
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