| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 1354.1 | Little scratches make big leaks | ZENDIA::REITH | Jim Reith DTN 226-6102 - LTN2-1/F02 | Sat Aug 31 1991 09:39 | 9 |
| Check the areas for nicks. A grain of sand in these areas can cause it.
The glow head area can be fixed with a new head and associated seal.
The crankcase/cylinder seal is a tough one. And you're right about
stripping the threads. I've seen it done in exactly this case. A thin
piece of paper gasket material MIGHT help. Anything too thick will drop
the compression. Take it apart and look it over very closely in the
seal area.
Good Luck
|
| 1354.2 | Cox help | FDCV25::P01YATES | | Tue Sep 03 1991 11:13 | 11 |
| Jim, thanks much for the tips on the Cox .051. I will try another glow
head to try and stop the leak in this area.
You also stated to try a paper thin gasket seak between the crank case
and cylinder head base to stop the leaking.
Can you tell me where I can obtain this material?
Regards,
Ollie
|
| 1354.3 | I've gotten several additional flights with these field repairs | ZENDIA::REITH | Jim Reith DTN 226-6102 - LTN2-1/F02 | Tue Sep 03 1991 12:07 | 23 |
| Take a hardcopy of this note with you and cut the proper sized hole
around the X below:
X
8^)
In other words, I've made successful gaskets out of all kinds of
materials including the cardboard label off parts packages and box
tops. These were all temporary repairs attempted at the field. The idea
is to put something soft (maleable) between the uneven surfaces which
can be compressed to fill in the voids (scratches). A more permanent
gasket can be made from the coated (wax?) paper that they sell at auto
parts places. Remember, you want very thin material to prevent dropping
the compression ratio too much (since you're moving the head farther
away from the reach (stroke) of the piston).
|
| 1354.4 | Or | SNAX::SMITH | I FEEL THE NEED | Tue Sep 03 1991 15:21 | 10 |
| One of the most common sealers used in the large RC engines is
HIGH TEMP RTV. I recently used this to seal up a Cox .049. It works
well. In my case, I just used it to seal the tank back plate to the
back of the tank, and between the tank and crank case. I don't have
a leaking problem around the glow head or where the cylinder head
screws into the crankcase. If you need to seal the cylinder head
where it screws into the crankcase, I just use something like Lock
Tite.
Steve
|
| 1354.5 | Cox help appreciated | FDCV25::P01YATES | | Tue Sep 03 1991 17:23 | 15 |
| Steve, thanks for the information. Since putting this note in the file,
I called Cox and they stated that I should tighten and untighten both
the head and the glow plug several times to set the seal and if this
does not answer the problem to send the head, piston and cylinder back
for a new one. Also, if that doesn't solve the problem then thay will
replace the engine. That sounds like a pretty good manufacturer
backing up his product.
I will try the Lock Tight and see if it works.
Thanks again.
Regards,
Ollie
|