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#21
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Cont O-300D oil leak problem
Well, I guess tightening up the through-bolts is OK, as long as you
don't over-torque them. I just rebuilt an O-300 and have worked on several of them. They are great engines, though at 145HP and 7 to 1 compression not behemoths of power. Crush washers on the rear case and on the oil sump are bad to leak, if they have been over-used. Buy new ones; they're cheap anyhow. Sometimes you'll have a leak on the rear case where a stud has been pulled loose from the magnesium housing, like at the seal cover for the tach drive. I see a lot of leaks around the pushrod-tube-to-crankcase boots, which are easy to get off their seats or not have their spring clamps seated properly. Those boots are tough and will last to TBO, but sometimes you'll have to adjust one to get it to do its work. To find a leak I always clean the engine and fire it up with the cowl off. Run it just long enough to get the oil warm and don't fry your cylinders. Leave your aircraft on the ramp so you can see where it's dripping. Invariably we have found our culprit leak and been able to stop it. I always paint gaskets like valve cover gaskets, and all the other gaskets, with High-Tack, front and back. If you get any leak around any of those gaskets the oil will be dyed red by the High-Tack, so you know generally where it's coming from. Of course, CA glue is great for stopping seepage around bolts and seams in the case. Put a vacuum cleaner to the oil filler and apply the glue. Finally, if people would handle cylinders gingerly and not hold them by their pushrod tubes, the damn things wouldn't leak. Having to use that beading tool to seal the tubes inside the cylinder head just means the cylinder was abused by someone. |
#22
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Quote:
maybe everyone besides me knows this, but what is "CA glue" - CyanoAcrylate glue? TIA, frank Last edited by clipclip : December 4th 05 at 01:01 AM. |
#23
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Cont O-300D oil leak problem
clipclip wrote:
maybe everyone besides me knows this, but what is "CA glue" - CyanoAcrylate glue? Contact Adhesive aka Superglue |
#25
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Cont O-300D oil leak problem
On 12/4/2005 6:36 AM, Darrel Toepfer wrote:
clipclip wrote: maybe everyone besides me knows this, but what is "CA glue" - CyanoAcrylate glue? Contact Adhesive aka Superglue Ummm, CA stands for Cyanoacrylate. It comes in different viscosities, basically thin, medium and thick (and possibly others?). -- Mark Hansen, PP-ASEL, Instrument Airplane Sacramento, CA |
#26
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Cont O-300D oil leak problem
Finally, if people would handle cylinders gingerly and not hold them by
their pushrod tubes, the damn things wouldn't leak. Having to use that beading tool to seal the tubes inside the cylinder head just means the cylinder was abused by someone. Amen to that. However, the aluminum head expands at twice the rate of the steel tubes (the coefficient of linear thermal expansion) and this tends to leave the tubes a little loose when things are hot. I don't know if Continental relied on the metal-to-metal seal when they manufactured them, or if there was some sort of sealant used that crumbles or disappears with age. That's why I use the Loctite, after the cylinders are installed so that the tubes won't be moved anymore, and the Loctite, being plastic and having a much larger expansion rate than even aluminum, keeps things sealed up all the time. Loctites reach their maximum strength at around 300 degrees, too. Dan |
#27
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Cont O-300D oil leak problem
Darrel Toepfer wrote:
Contact Adhesive aka Superglue Contact adhesive is completely different from Superglue. Superglue is a brand of cyanoacrylic glue. Contact adhesive is more viscous and resembles thin rubber cement. You apply a thin layer to two surfaces, let it dry, and put the surfaces together. It bonds as soon as the surfaces make contact; hence, the name. It's used for things like applying plastic laminate to substrate material for countertops. George Patterson Coffee is only a way of stealing time that should by rights belong to your slightly older self. |
#28
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Cont O-300D oil leak problem
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