O-470-11B Continental

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unforgiven11B
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O-470-11B Continental

Post by unforgiven11B »

Work led me to stumble upon a O-470-11B, thought about it for a bit and then went back and bought it. I know it runs as it was just on a boat for all of 2 hrs. I have all of 500 bucks in it so now I need to see if it’s a simple issue or if I got a lemon. Previous owner is a wealthy guy he bought this to replace his engine this was installed and he ran it but it was burning some oil, the cylinder was pulled and inspected owner couldn’t get just cylinder in time so got a new engine.
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Hopefully I can get some information on this engine and get some parts.
unforgiven11B
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Re: O-470-11B Continental

Post by unforgiven11B »

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John Fenner
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Re: O-470-11B Continental

Post by John Fenner »

I would go ahead and pull the other 5 cylinders, have a good valve job done on them a true hone of bores, being sure that they are all standard or plus .015", buy a set of 640518 pistons and a new set of rings and a top overhaul gasket set, will be a great powerplant.
I never finish anyth,,,.
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Slidin Gator
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Re: O-470-11B Continental

Post by Slidin Gator »

You are probably aware, but here is the overhaul manual for that engine.

https://www.southernairboat.com/pdf/air ... 0_11_o.pdf

What's the piston look like on the bad cylinder? I agree with John, I would send out the full set for a valve job, hone and new rings so I know what I am starting with. But don't be afraid to reuse the pistons if they clean up and look decent. The original pistons in the 470-11 were low compression I think (Wikipedia says 213 Hp at 2,600 RPM), hence John's suggestion of a higher compression piston. But there is no telling what is actually in there?
I still think I-10 is the Mason Dixon line.
2013 Mike Stossel Boats, 13' x 7' deck over, IO-540, 74" NGQ less winglets.
unforgiven11B
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Re: O-470-11B Continental

Post by unforgiven11B »

Mr. Fenner, I will be picking it up later this week and will get more numbers and pictures posted.

Sliding gator- thank you I wasn’t able to locate that so very much appreciate it.

. Piston was black on top like cylinder, no damage, dished, skirt appeared in good condition as well as the ring lands. I thought I took some pictures of it but I must not have as I can’t find them.
As far as rings and pistons, probably have to wait on the a/c mech. to tell me what to get. Not sure if they are chrome or steel cylinders can’t remember the number of rings on piston.
Never done an aircraft engine. You think the valve job, hone and rings is going to be pretty pricey? Not familiar with any a/c shops near me. So I’ll do some looking and probably take them to the best recommendation. Only ever heard a/c are expensive to work on but so is this LS LOL.

Planning to toss it on a small Rivited hull, 12-13’. Mr Gerald (new old glory)has a green frogging boat, its light and small turns on dime feels like it’s on rails. Hopefully I can get my hands on something like that. Scoot along but not really a brush beater.

Thanks again for all the information I’ll update y’all when I get it loaded and in the shop where I can get more pictures.
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Re: O-470-11B Continental

Post by unforgiven11B »

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Ok well I said I’d post more pics well here they are. I’m unsure what SAIC means but it’s stamped into block at the hub snout with date 13-7-54 , 618.13hrs. I still need to get a price on getting the 6 jugs honed, valve job and seats. Hopefully can start this project soon.
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Re: O-470-11B Continental

Post by unforgiven11B »

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Re: O-470-11B Continental

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Re: O-470-11B Continental

Post by unforgiven11B »

One of the rings that came with engine was in pieces not sure if it happened prior to removal or it it was broken taking it off piston. If I read correctly I have steel cylinders cuz there is only 3 piston rings per piston thought I read chrome have 4? I’ll continue my reading of the manual provided by Sliding Gator and see if I can figure anything else out.
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Slidin Gator
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Re: O-470-11B Continental

Post by Slidin Gator »

With the cylinder off you can inspect the bore. If it is chromed it will look like broken glass. Try taking and posting a picture of the bore.

Chase the piston part number down, but that looks dished to me, making them lower compression.
I still think I-10 is the Mason Dixon line.
2013 Mike Stossel Boats, 13' x 7' deck over, IO-540, 74" NGQ less winglets.
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Re: O-470-11B Continental

Post by unforgiven11B »

I will get a picture posted of the inside of the cylinder. You can still see cross hatching all the way down the bore and it does not look like broken glass inside
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Slidin Gator
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Re: O-470-11B Continental

Post by Slidin Gator »

I had a chrome cylinder handy, here are a couple of pics. The cracks in the chrome are a feature, they hold oil, otherwise the rings will wear out quick. Getting the cracks right is a bit of an art form. Note that plain steel bores use Chromed rings. Chrome bores use iron rings. There is also a nitriting process used, but much more rare.

Image

Image
I still think I-10 is the Mason Dixon line.
2013 Mike Stossel Boats, 13' x 7' deck over, IO-540, 74" NGQ less winglets.
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Slidin Gator
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Re: O-470-11B Continental

Post by Slidin Gator »

This thread has good coverage on a 520, should provide some pointers, particularly regarding valve adjustment. 520 lifters have a pretty big adjustment range, close to 1/8". I would guess the 470 is similar.

viewtopic.php?f=47&t=71762
I still think I-10 is the Mason Dixon line.
2013 Mike Stossel Boats, 13' x 7' deck over, IO-540, 74" NGQ less winglets.
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Re: O-470-11B Continental

Post by unforgiven11B »

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Slidin Gator
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Re: O-470-11B Continental

Post by Slidin Gator »

Hopefully it hones out, looks like steel to me. More info for your future use.
Continental Magneto Manual.pdf
(2.5 MiB) Downloaded 6 times
I still think I-10 is the Mason Dixon line.
2013 Mike Stossel Boats, 13' x 7' deck over, IO-540, 74" NGQ less winglets.
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Re: O-470-11B Continental

Post by unforgiven11B »

Appreciate the info Sliding gator, my first aircraft engine so we’ll see how bad it gets one I start pulling the jugs off hopefully it will clean up good and run halfway decent.
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