O-300 Overhaul for '98C

cessna170bdriver · Post by **cessna170bdriver** » Tue Feb 21, 2006 7:12 pm

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lowNslow · Post by **lowNslow** » Tue Feb 21, 2006 7:52 pm

Miles wrote: I'll go with the "single coil spring washer", AKA "split lock washer", technically known as MS35338.

Miles, most of the exterior nuts use the single coil spring washers, at least thats what is shown in the IPC and what was used on my engine at Lycon.

By the way there was an article in the latest "Light Plane Maintenance" (Feb '06) about running a rebuilt engine in sans a test cell. If you haven't seen it is kinda interesting.

cessna170bdriver · Post by **cessna170bdriver** » Tue Feb 21, 2006 8:33 pm

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N170CT · Post by **N170CT** » Tue Feb 21, 2006 10:06 pm

Folks...back to the paint discussion for a moment. I painted my rusted valve covers after sandblasting and the darned things promptly rusted again

. Any suggestions other than chroming these things???
regards,
chuck

cessna170bdriver · Post by **cessna170bdriver** » Tue Feb 21, 2006 11:35 pm

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Indopilot · Post by **Indopilot** » Wed Feb 22, 2006 4:13 am

We are snailing along getting our Lyc 180 repaired and ready to install. One of the things I did recently was powder coat the rocker covers, intake tubes and push rod housings to match our paint colors using the shops Eastwood Hot Coat Powder coating kit. This do it your self kit costs $100.00 according to their catalog. 8 ounce paint powder bottles cost $9.00 in a host of colors. I set up an old oven to bake the powder( 400 degrees) and you need a regulator that will supply about 8 lbs of air pressure froma bottle or compressor. Looks better longer I believe.
They have a pretty good online site http://www.eastwood.com. Anyway it worked good for us . Brian

cessna170bdriver · Post by **cessna170bdriver** » Thu Feb 23, 2006 7:08 am

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Thu Feb 23, 2006 11:26 am

Yep Miles no doubt if you do another engine build up a month from now you be able to do it in half the time assuming you pocket book would stand it.

Hate to say this but the two typs of sealant used together doesn't sound right. I'm not sure I'd have done that without confirming it with an expert which I'm not. I have no doubt the SIL says this I just hope it's not a typo.

Anybody with first hand knowledge of this?

johneeb · Post by **johneeb** » Thu Feb 23, 2006 12:42 pm

Miles,

Great progress!

What is the lubricant you used on the Cam lobes and Cam followers?

cessna170bdriver · Post by **cessna170bdriver** » Thu Feb 23, 2006 5:20 pm

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Dave Clark · Post by **Dave Clark** » Thu Feb 23, 2006 5:21 pm

The only case sealer I've used along with the silk thread in the last ten years or so is Loctite 515 or Yamabond (thin) available at Yamaha outboard shops. Both are similar products and set up in the absence of air. Gives you a nice working time. Since then never had any case leaks. Mixing the Permatex in there is questionable in my opinion.

cessna170bdriver · Post by **cessna170bdriver** » Thu Feb 23, 2006 5:59 pm

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Post by **GAHorn** » Thu Feb 23, 2006 8:35 pm

I'll bet it was a curious day at the beer-joint the day the Continental guys on the assembly line got together and discussed their error when they assembled a bunch of engines using two different gasket-products, ... and swore to keep it a secret amongst themselves until they learned the results from future warranty claims.

steve grewing · Post by **steve grewing** » Fri Feb 24, 2006 12:13 am

Miles,
I had a similar conversation with a TCM tech rep prior to the assembly of my engine last year regarding typo's, vague instructions, sealants, etc. My call to TCM was prompted by an earlier phone conversation with a well-known engine overhauler who told me the best sealant on the case halves was the blue colored RTV and sold at auto parts stores. I don't remember it's name. The TCM rep was quite adament about following the SB which specifically lists the two sealants to be used on the case halves. I have had no problems with mine to date one year and 85 hrs.

Steve

Post by **GAHorn** » Fri Feb 24, 2006 1:01 am

One thing to consider, especially on case-halves, is fretting....the "working" of the case halves against each other over the years/hours of operation in which thermal expansion/contraction, vibration, and stretching/pulling/pushing of cylinders/rods/pistons etc.. This causes a great deal of stress at the case halves.
For many years, TCM recommended only Hylomar....a Rolls-Royce product, which resembles the blue RTV found at automotive stores....but is NOT the same. Automotive RTV's are usually silicone-based and do not offer much friction to combat fretting of the case halves. I would not use it.
RTV also has a bad habit of pressing out between the cases when they are torqued down, and bits of RTV can become loose and circulate within the lubrication system. Not a good thing.

The International Cessna^® 170 Association

O-300 Overhaul for '98C

Overhaul sealants