O-300 Overhaul for '98C

Post by **GAHorn** » Tue Apr 25, 2006 11:45 am

The early Hawkers had a sump-jar system for their batteries. The battery vented via tube into a Mason-type jar, which was about 1/3rd full of baking soda, then the jar had an overboard discharge line from it's lid.
If the battery threw-up, it was directed into the jar where it was nuetralized by the soda before being tossed overboard. Helped keep down corrosion due to acid spills.
Whenever I remove my battery for service, I always plug the box-drain and fill it with soda/water solution and let it soak. Then I remove the plug and observe the solution drain. (It's hard to imagine why some bugs will still build a nest in that drain tube.) When it's dry, I reinstall the battery, but not before sprinkling some soda into the bottom.
Just keep that stuff away from the battery's vents. Only a tiny amount will make a mess if you get it near the vents (and it does your battery no good to nuetralize it's acid.)

If everyone had an Aircraft Spruce catalog, and if they'd just thumb thru it from time to time, you'd be amazed at what all is in there. About half of all calls I get can be solved with a referral to Spruce/WagAero/Univair.

Bill Hart · Post by **Bill Hart** » Tue Apr 25, 2006 1:00 pm

Our C-130â€™s have maintenance free batteries that the vent is sealed but we still have to have the vent jar.

johneeb · Post by **johneeb** » Mon May 29, 2006 1:45 pm

Miles

Have you run your engine? If so how have you flown the airplane?

Johneb

cessna170bdriver · Post by **cessna170bdriver** » Mon May 29, 2006 5:07 pm

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cessna170bdriver · Post by **cessna170bdriver** » Mon Jun 12, 2006 7:50 pm

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N2865C · Post by **N2865C** » Mon Jun 12, 2006 8:58 pm

cessna170bdriver wrote: 1) I'm a little concerned with high oil pressure, as I saw 50+ psi at 1800 RPM. I probably need to check gauge accuracy, but I don't have access to a calibrated gauge to check it against. In the meantime, I'm going to search through the forums and see what I can find on this issue.
Miles

Congratulations

I had questions about high (55psi) oil pressure when I purchased my plane. My gauge was green to 45 psi and redlined at 50 psi. Here is the answer....

http://cessna170.org/phpBB2/viewtopic.p ... highlight=

cessna170bdriver · Post by **cessna170bdriver** » Mon Jun 12, 2006 9:46 pm

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170C · Post by **170C** » Mon Jun 12, 2006 10:44 pm

Congrat's Miles on your first new engine run. I remember when I did my first one after OH & it sure is a great feeling to see it fire up and run. I also had a few leaks. First one was my AI forgot to install the small plug that is under the aft engine mount on the left side. That one showed up when I spun the engine over w/o plugs in the top of cylinders to see if we got oil pressure. The other one was in an area where the accessory case mated with the engine case and AI put some type of sealer on it and so far after 500 hrs it hasn't leaked there again (it has in numerous other places). Keep us up to date on how it runs again and after you get that carb exchanged we need to hear how it fly's!

Post by **GAHorn** » Tue Jun 13, 2006 1:07 am

Miles, I'm not at home where I might research this better for you. (I located a mfr for this item but can't remember who it was just now.) I'd like to make a suggestion. Forget about that copper oil line. It'll only risk vibration-hardening and breaking on you in flight and dumping all your oil.
Replace that line completely with a new, teflon-lined, steel-braided line mfr'd by one of the hose mfr's. It'll be a lifetime hose and you'll be happier. (I'm hoping to have one installed this annual next month.) Cleo can tell you about what happens when that copper breaks. (And Eddie Rickenbacker landed at night in the desert near El Paso due to a broken, copper oil line.) Copper is a bad material for that line.

cessna170bdriver · Post by **cessna170bdriver** » Tue Jun 13, 2006 1:21 am

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cessna170bdriver · Post by **cessna170bdriver** » Tue Jun 13, 2006 5:13 am

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lowNslow · Post by **lowNslow** » Tue Jun 13, 2006 4:40 pm

Miles, congrats on getting your motor running! Hope the debugging goes well.

I also have oil pressure that is 55psi, but have never seen any official document that says this is OK. It would be nice to have something to reference to confirm this with your friendly neighborhood FAA guy or your AI.

Post by **GAHorn** » Tue Jun 13, 2006 9:53 pm

lowNslow wrote:Miles, congrats on getting your motor running! Hope the debugging goes well.

I also have oil pressure that is 55psi, but have never seen any official document that says this is OK. It would be nice to have something to reference to confirm this with your friendly neighborhood FAA guy or your AI.

The TCM field rep who told me that oil press. up to 60 psi is fine is Corey Thompson, Colorado Sprgs.

lowNslow · Post by **lowNslow** » Tue Jun 13, 2006 10:11 pm

gahorn wrote:The TCM field rep who told me that oil press. up to 60 psi is fine is Corey Thompson, Colorado Sprgs.

Yes, I remember you discussing this, but it would be nice if TCM put out some sort of official documentation about this given that all the docs we currently have (i.e. AFM, overhaul manual, etc.) show a normal range of 30-40 psi.

n3833v · Post by **n3833v** » Wed Jun 14, 2006 11:22 am

My engine has always run 50-60 psi since my engine overhaul in Jan 01. My A&P told me not to worry. I never checked the gauge with a standard, but this was because before the overhaul, the pressure was 40-45 psi.

John

The International Cessna 170 Association

O-300 Overhaul for '98C

First Engine Run