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Does anyone have any O-200 O-300 chrome or standard cylinders available?

an8pilot

Mike
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Does anyone have any O-200 O-300 chrome or standard cylinders available?

I'm back home for a month and a half and have disassembled my O-300-A engine on my 1956 172 because found the beginnings of a bad cam lobe.

So I had to take the engine down.
With my dial bore gage (which took 6 hours to take apart clean lube and make it work again after I found a new one of the same caliber / model was 500 used on ebay) I found that I have one 1 ea standard cylinder ans it is only standard because of chrome. 4.062 - 4.064 And would require cast iron rings.

There is one steel which was a newly overhauled one which was steel but
it was 4.069 which requires plus + .005 chrome rings. And I found the exhaust valve... (newly overhauled) with a lot of slop in the guide.

There are 3ea steel at 4.078 which is plus + .015

And the last steel one is at service limit of 4.084.

But........... it was running well.

The only reason I took it down enough to see the cam lobe was:

Changing to a key start instead of pull/electric spontaneous destrucatble starter that scared me. Which requires cutting off the original starter gear guide shaft. To make it easy I took the engine pont bolts out to move the engine forward. So I might as well replace the rubber mount bushings... So why not remove the engine mount and glass blast it and check for cracks and repaint. And why not clean up and paint the firewall. And then why not pull off number 3 jug and look inside my new to me engine. Why not pull off jug 5 as well and hget an even better look.

Then "Oh my whats that" The severity as affected by a service bulletin would let me continue 100 hours at a time. But after a while of thinking.... that's not me.



So.... anyone got some used O-200 or O-300 cylinders that are chrome that they took off for no reason other than those $780 dollar Titan cylinders sans $50 piston pins and rocker arm $22 overhaul. = $852 a set sans shipping, Bearings, ndt polish and cad std crank, overhaul rods, and get new rod bolts and nuts, already bought overhauled lifters, inspecting my own plungers... and need to get a seal kit and rings, and find an overhauled cam or a repairable one.

So if I could find some chrome standard bore cylinders that would be good, and some standard new pistons, I could get at least ONE airplane flying. It's easy to take cylinders off once in a while. Not so easy to take down the whole mashugana or enchalata'. Don't even know how to spell those.
 
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crankyklingon

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If you take them back to std you will need a set of new pistons. Anyway if that is the course of action you choose Aircraft Cylinders of America can do the bores with the latest Nickle silicon carbide for around $200 per hole. Not sure if they can make up for .015 over but a call will answer that question. I had bores .010 past service and they brought them back to new limits std.

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Don Adamson

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I have six first run Superior cylinders that I have already had nu-chromed by Aircraft Cylinders of America. $1800 for the set. No pistons, valves, springs, pins, etc.; just bare cylinders ready to build up.
 

crankyklingon

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Epic deal right there!

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an8pilot

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Both good suggestions.

Got me thinking. I could send out my own cylinders, 5 of them to get chromed.

They all have good seated valves and guides and new springs I had just installed before sliding down the rabbit hole of putting a key start starter on.

Except the cleanest most newly installed cylinder, installed just before I got the airplane, where I found the exh valve guide loose as a goose, or maybe a rabbit.... Same cylinder had way too long a rod on the exhaust. And is +.005 over standard meaning plus .005 over std rings.

But anyway, I guess I could send my own cylinders out for chrome and get back to standard matching ring sets and not have to worry about valves other than keeping them segregated and replace the keepers.

That would be just disassembling, sending the jugs through the glass blaster and std piston through the cleaning process. I have 4 new std pistons laying around so would need one more.

So for the cylinders would be 1000 for the 5 chrome thereabouts \+ shipping.

But 1st run superior cylinders sound good.... But then there is the valve match up issues and costs.... hmmmm



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planegene

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I have a bare cylinder sitting on the shelf. Dont know anything about it. Don't think it has a piston, could probably scrape up som rocker arms.


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an8pilot

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Yeah I'm still looking.

I don't have any valve seat cutting tools for the ones above. Always sent cylinders out for guides and seat cutting other than mundane lapping with lapping compound and a reversible drill.

Would be a different story if the 6 above cylinders seats were already cut to standard for my 6 cylinder O-300 . Then I could just put in my good valves. Get 1 or 2 more standard pistons as I have 4 new standard pistons for O-200 / O-300

If I had to send the ones above for valve seat grinding compared to the cost of new cylinders which come with new pistons and only missing 50$ piston pins which I already bought... they don't make sense money wise.

175 - 200 a cylinder to get chrome put on, plus shipping, buy 1 new std piston, and do one valve guide, which the seat for that one valve guide would then probably need replacing, unless that seat had enough meat on it to match the center of the new guide, due to the center of the guide being probably not exactly where the original was.

Mmmm chroming my own cylinders at 200 times 5 cylinders, one valve guide and maybe seat, which I don't know that cost today. One new piston. That's about 1300 or so for 5 chromed, and one piston. Not including rings shipping etc.

If I buy someone else's already chrome cylinders at 1800, which I then need to pay to get seats ground, plus buy 1 or 2 new pistons to match. About 2600 total maybe. Not including rings. Shipping etc.

Just using this spot for my notes and figuring.

Of course crank, rods, cam lifter/plungers etc, and bearings don't know what that's going to cost yet. Have an idea though. They are in the works at the shop right now. Sent them out last Monday.

One way or the other though. I'd much more be glad doing my own work. In fact I always wished I could go somewhere to get my hand on doing my own valve grinding. Not that I would make a living at it. Just would have liked to have had someone teach it to me. But that's never presented itself.

Just using this spot to organize my thoughts on it.


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an8pilot

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Have really enjoyed learning from Don Adamson on valve grinding on his cylinders above.

Have been really enjoying talking with him on this and other engine work stuff.
 

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