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Jimmy Young
Joined: 24 Nov 2007
Posts: 182
Location: Missouri City, TX
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 Posted: Fri Apr 18, 2008 5:30 am Post subject: decarbon check advice |
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I need some advice as to what it is I'm looking for on a decarbon checkon a 503 DCDI. I've got the exhaust port open, and I see two very clean looking piston skirts. The piston tops have a little carbon build up on top, not much. The underside of the heads are very clean and shiny. Regarding the rings, they lok clean to me, but I can't get them to "move" very easily, more so because I'm afraid I'll break them than anything else. I only see one ring, maybe about a 1/2" down from the top. There is another possible ring right at the top, not sure. What is the best way to check their movement, and what with?
Thanks -
Jimmy Young
FS II
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Jimmy Young
Missouri City, TX
Kolb FS II/HKS 700 |
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lucien
Joined: 03 Jun 2007
Posts: 721
Location: santa fe, NM
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| Posted: Fri Apr 18, 2008 9:23 am Post subject: Re: decarbon check advice |
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| Jimmy Young wrote: | I need some advice as to what it is I'm looking for on a decarbon checkon a 503 DCDI. I've got the exhaust port open, and I see two very clean looking piston skirts. The piston tops have a little carbon build up on top, not much. The underside of the heads are very clean and shiny. Regarding the rings, they lok clean to me, but I can't get them to "move" very easily, more so because I'm afraid I'll break them than anything else. I only see one ring, maybe about a 1/2" down from the top. There is another possible ring right at the top, not sure. What is the best way to check their movement, and what with?
Thanks -
Jimmy Young
FS II |
There are two rings, the lower one is a regular "square" compression ring and the one at the top is a Dykes type ring.
To check for free movement, center the two rings in the exhaust port and then carefully rotate the crank. You should see oil squeeze out of the ring gaps, and the piston should move microscopically while the rings stay put.
Generally, the rings begin to stick at the gap, tho, which you can't see from the exhaust port. That starts at about 100 to 150 hours usually, depending on how often and how rich the motor is run....
LS
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LS
Titan II SS |
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gaman(at)att.net
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| Posted: Fri Apr 18, 2008 2:36 pm Post subject: decarbon check advice |
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Jim,
There is another ring about 1/16th from the top.I use a popcicle stick to push in on the rings.To see a little oil squeeze out would be best,but free movement is essential.There is considerable tension by the rings against the cyl walls,got to push a little.How many hours on it,and is it oil injected?
---
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Possums
Joined: 03 Nov 2007
Posts: 247
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| Posted: Fri Apr 18, 2008 3:00 pm Post subject: decarbon check advice |
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At 09:27 AM 4/18/2008, you wrote:
| Quote: | I need some advice as to what it is I'm looking for on a decarbon checkon a 503 DCDI. I've got the exhaust port open, and I see two very clean looking piston skirts. The piston tops have a little carbon build up on top, not much. The underside of the heads are very clean and shiny. Regarding the rings, they lok clean to me, but I can't get them to "move" very easily, more so because I'm afraid I'll break them than anything else. I only see one ring, maybe about a 1/2" down from the top. There is another possible ring right at the top, not sure. What is the best way to check their movement, and what with?
Thanks -
Jimmy Young |
Is it time to decarbon? I've got way over 700 hours without doing it,
but I run mine pretty regular. "What you should see is oil ooze in the ring groove if you rock
the piston up an down with the prop".I would buy a compression tester at you local auto parts dealer for
about $20 as an additional way to test weather your rings are sticking.
If you've got a starter, it works great. Mine still has 120 psi on both cylinders, believe it
or not.
Also read this article.
http://www.800-airwolf.com/pdffiles/ARTICLES/part47.pdf
[quote][b]
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Jimmy Young
Joined: 24 Nov 2007
Posts: 182
Location: Missouri City, TX
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| Posted: Sat Apr 19, 2008 2:12 am Post subject: decarbon check advice |
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Lucien, Gary, & Possums-
My engine has 190 hrs., oil injected, & elect. start (someone asked). I do have movement on the rings and oil flows when they are pressed, so I'm calling it good. Thanks for the tips.
I'm going to a 2-stroke engine class early in May at S. Miss. Light Aircraft, hopefully will learn most of what I'll need to know.
Jimmy Young
FS II, 503 DCDI
Houston
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296 Bytes |
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243 Time(s) |
_________________
Jimmy Young
Missouri City, TX
Kolb FS II/HKS 700 |
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