Today's Message Index:
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1. 12:24 PM - Tip of the day for an oozing valve cover (Roger Lee)
2. 01:20 PM - Re: 582 egt mismatch (Tom Beirne)
3. 01:29 PM - Re: Tip of the day for an oozing valve cover (Dan Billingsley)
Message 1
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| Subject: | Tip of the day for an oozing valve cover |
Do you have a leaky valve cover or it just oozes a little oil on the bottom edge,
but not enough to drip. Well the tip of the day for a fix.
I have tried new "O" rings, Loctite 574 and and Loctite 5910 and they still oozed.
The fix is to pull them off. Lay the valve cover flat on a piece of 220 grit
sandpaper and lightly sand the edge down. You will see when you do this shiny
spots where the sandpaper has touched and a dull flat looking edge where it
did not. Lightly sand the edges on the flat surface until you see a shiny surface
all the way around. You aren't trying to sand it to death. Take off just
enough for the dull color on the edge to be shiny. Clean the edges after sanding
with a good cleaner and clean the surface of the cylinder surface mating up
to the new surface of the valve cover. Then coat the "O" ring with a light coating
of white grease (compatible with fuel) and torque the screw to 90 in/lbs.
The sanding takes out any imperfections in the valve cover edge and allows more
"O" ring pressure against the mating surface.
Have a nice X-mas!!!!
--------
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=276493#276493
Message 2
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| Subject: | Re: 582 egt mismatch |
> Anyway, this is the guy with the "swelling Viton tip"...we think. When my carb
first started overflowing out of the vent tube, I found the the EGT on that
cylinder would rise about 200 EGT. It was a very reliable indicator of fuel
venting. Why? I don't know. But everytime the temp went up, I could see a stream
of fuel trailing me...(Trike). However it never got to 1300 like it did with
you....about 1200 max with me but kept running just fine...until it quit
from fuel starvation last week.
>
> Keep in mind this Viton tip swelling is just an idea so far...but what the
heck else can it be? We've done everything possible from compression checks,
visual cylinder inspections, complete changing of fuel lines, filter & fuel pump,
pump location & orientation. Everything but overhauling the damn engine!
We also know positive it's not electrical.
Just happened to be reading some light rotax informational literature when I came across this http://www.800-airwolf.com/pdffiles/ARTICLES/part2.pdf
Under the image of the carb on the first page in the section titled "What to do
if you have a fuel supply problem". The interesting bit is is where it says
"Test the fuel pressure output at the carb. It should be between 2.9psi and 7.2psi.
Below 2.9psi the fuel bowl will starve. Above 7.2psi the float valve will
be overpowered and fuel will start to flow out the vent tubes."
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=276498#276498
Message 3
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| Subject: | Re: Tip of the day for an oozing valve cover |
Thanks Roger,
That's a good one.
Dan B
Mesa, AZ
----- Original Message ----
From: Roger Lee <ssadiver1@yahoo.com>
Sent: Sun, December 6, 2009 1:24:03 PM
Subject: RotaxEngines-List: Tip of the day for an oozing valve cover
Do you have a leaky valve cover or it just oozes a little oil on the bottom edge,
but not enough to drip. Well the tip of the day for a fix.
I have tried new "O" rings, Loctite 574 and and Loctite 5910 and they still oozed.
The fix is to pull them off. Lay the valve cover flat on a piece of 220 grit
sandpaper and lightly sand the edge down. You will see when you do this shiny
spots where the sandpaper has touched and a dull flat looking edge where it
did not. Lightly sand the edges on the flat surface until you see a shiny surface
all the way around. You aren't trying to sand it to death. Take off just
enough for the dull color on the edge to be shiny. Clean the edges after sanding
with a good cleaner and clean the surface of the cylinder surface mating up
to the new surface of the valve cover. Then coat the "O" ring with a light coating
of white grease (compatible with fuel) and torque the screw to 90 in/lbs.
The sanding takes out any imperfections in the valve cover edge and allows more
"O" ring pressure against the mating surface.
Have a nice X-mas!!!!
--------
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=276493#276493
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