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5 hp Myrick forge blower engine restoration


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  #1  
Old 12-15-2015, 10:26:05 PM
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Default 5 hp Myrick forge blower engine restoration

Been working on this on and off for the last 2 years and it is finally coming together. It is an unusual Myrick Eclipse 5hp forge blower engine made about 1918 or so. It's called a forge blower engine due to the large paddle fan on the side which blows air over the cylinder. The cylinder has perforated steel mesh fins cast into the cylinder and was patented by PJ Messer. When I picked up the engine, it was missing the correct flywheel and the spiral gears used to run the exhaust cam and magneto were very worn. This past summer a second basket case engine was acquired and I began salvaging the gears and flywheel off of it. The bore is 5-1/4 and stroke I believe to be about 6". The crankshaft of the first engine had the main crank journal badly scored so I sent it out for grinding about 20-30 thou undersized. The bearing is split bronze which I bored out about 40 thou, cast in a layer of Babbitt and re-bored to fit the crank. This engine represents the height of Myrick engineering including closed crankcase and Timken ball bearing main bearings.

I'll be posting more pix as the engine comes together, but here is what I started with. Picture of the forge blower side. Also had to mention that the three known examples of this engine are numbered 1858, 1859 and 1860 .
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  #2  
Old 12-17-2015, 11:46:20 AM
TomBall TomBall is offline
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Default Re: 5 hp Myrick forge blower engine resto

Paul,that is one unusual looking Myrick. What governor setup did it use? You have a knack for finding the oddball Myricks. Maybe I'll have to start looking again.
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Old 12-17-2015, 06:34:44 PM
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Default Re: 5 hp Myrick forge blower engine restoration

Tom, it has a single flywheel with two weights and a sliding coller on the crankshaft. The collar engages a lever with the governer latch at the other end. If you look at the pix with the push rod, you can see where the lever goes. It is kinda similar to the H model .

Last edited by PaulGray; 12-17-2015 at 06:35:32 PM. Reason: Forgot text
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Old 12-20-2015, 07:44:57 PM
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Default Re: 5 hp Myrick forge blower engine restoration

Here are the details of the drive which operates the exhaust cam and the new felt seal install. Luckily I had a sheet of 1/2" felt. A simple 3/8 strip did the trick. It is a bugger to put together as you have to slide in the shaft from the end with the bushing and get the cam, gear and spacer (all keyed) to line up. You can see the key on the donor engine and the inside of the housing. The spacer is then installed and held in place with a screw. There is a left hand threaded collar on the crank which rubs against the seal and preloads the ball bearing assemblies. Yesterday I was able to get the crank bearing scraped in and I am pleased with it.
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Old 12-20-2015, 07:47:09 PM
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Default Re: 5 hp Myrick forge blower engine restoration

Could only upload one pix at a time from my iPad. Here is pix 2
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Old 12-20-2015, 07:49:12 PM
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Default Re: 5 hp Myrick forge blower engine restoration

Bushing which has to come out to remove the keyed shaft.
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Old 12-27-2015, 04:02:14 PM
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Default Re: 5 hp Myrick forge blower engine restoration

Been off on Christmas vacation and working on the Myrick. When I posted the thread, I had most of the big pieces cleaned and painted. Over the last week or so I made cart for it, scraped in the new rod bearing and fabricated a new wrist pin from 1-1/8 drill rod. The rod took me about 3-4 hours of patient work to get it fitting nice. Assembling the engine was a bit of a puzzle. The crank is laid inside the block and one of the end covers with the ball bearing is inserted while the crank is then lifted into position. Then the other cover with bearing is installed. A left-handed threaded collar on the flywheel side provides the pre-load on the bearings and takes up the end play in the crank. The spiral gear is keyed to the crank. The rod and piston are then attached as the rod nuts are on the top side of the bearing. The cylinder is lowered onto the piston and fastened down. The cam drive housing with the other spiral cut gear is test fit on the crank moving the camshaft until the exhaust cam begins to open just before bottom dead center. When the timing is correct, it is bolted down. The blower housing is installed using silicone sealer on the attaching bolt threads since they go through the crankcase. I have to order some 7/16 keys for the blower fan and flywheel to permanently attach them. Next step is to seat the valves into their housings. Since the valves drop down into the cylinder I am going to drill a small hole in the stems about 1" above where they go into the head and insert a cotter pin so that if the keepers come off, the valve will not drop into the cylinder....cheap insurance.
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Old 12-27-2015, 04:04:16 PM
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Default Re: 5 hp Myrick forge blower engine restoration

Picture of the blower housing side
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Old 12-27-2015, 04:08:10 PM
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Default Re: 5 hp Myrick forge blower engine restoration

Here is detail of the governer, cam drive and magneto mount. This engine takes a Wico L1. Oh, and BTW, that big honkin thing sticking out of the crankcase is the breather/ oil separator. I call it the collection box...
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Old 12-28-2015, 09:33:54 PM
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Default Re: 5 hp Myrick forge blower engine restoration

Finished making a new handle for the fuel mixer assembly. The engine has a tapered brass gas metering cock which I had but the handle was missing. Fortunately, I had a picture of the other known assembly to copy. The sector for the gas valve was made from a disk of brass about 0.4" thick and hogged out from there. I made the rectangular holes with a 1/8" end mill and filed the corners square. The handle on the original was cast with the sector; mine has a screw in handle which also locks it to the square shaft on the tapered pin. I also made a new push rod for the exhaust valve and new keepers for both valves. I'll post the valve bodies tomorrow. In operation, fuel come in from the left, air from the bottom and a flat spring-loaded valve from the top. The fuel turns vertical inside casting and is held in check by the spring loaded valve. When the engine calls for fuel, the flat valve lifts metering in fuel and air delivering it to the engine on the top right.
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Old 12-29-2015, 12:37:48 AM
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Default Re: 5 hp Myrick forge blower engine restoration

Interesting engine. Nice work.
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Old 12-30-2015, 09:22:32 AM
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Default Re: 5 hp Myrick forge blower engine restoration

Installed the mag and drive and adjusted the timing so with the L1, I can get it to trip before and after TDC. New push rod also installed. Shroud to go on when all is running and adjusted.
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Old 12-30-2015, 09:28:24 AM
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Default Re: 5 hp Myrick forge blower engine restoration

Valve cages installed with new keepers and safety cotter pins. I tried to roll it over with a key partly stuck in the flywheel...it has an obscene amount of compression. When I get the fan on, the extra inertia may help when I engage the governer latch, roll it over a few times to build up speed and then release it. If not, I may have to put a compression release on it..!
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Old 01-02-2016, 04:19:00 PM
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Default Re: 5 hp Myrick forge blower engine restoration

This bugger had some awesome compression; so much so that I couldn't crank it over. And I made a compression release spark plug and now cranking it over is manageable. So I thought what the heck, let's hook up some gas and see what happens. Was able to get a few pops in spurts , But I think it needs an accumulator....stay tuned...
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Old 01-02-2016, 07:15:21 PM
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Default Re: 5 hp Myrick forge blower engine restoration

Paul,
Any chance you could rotate your pictures before posting them?
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Old 01-03-2016, 11:22:02 AM
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Default Re: 5 hp Myrick forge blower engine restoration

Paul, I restored a 5HP upright Bovaird Seyfang . I used new rings and it too has crazy compression. It is a hot tube engine and when it fired it would almost break your wrist. I never got around to messing with hot tube lengths and heat range, just set it in the showroom with the rest. Someday I'll get back to it. Good job on your engine.
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Old 01-04-2016, 10:00:35 PM
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Default Re: 5 hp Myrick forge blower engine restoration

Looks good Paul, cant wait to see it at june? Its very similar to the tall boy with the "collector box" and the screen cooling fins, how close in age would you say the two designs are?
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Old 01-04-2016, 11:13:32 PM
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Default Re: 5 hp Myrick forge blower engine restoration

With the designs that came out of that little Olean NY factory it's really amazing they didn't achieve a greater amount of success on a national scale. P.J. Messer was a mechanical genius. The designs he came up with were in most cases several years ahead of most others. Your forge blower 5 is a case in point.
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Old 01-05-2016, 05:50:53 AM
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Default Re: 5 hp Myrick forge blower engine restoration

Nate, date-wise, the tall boy and blower engines are contemporaries. Why Myrick made the two designs is up for grabs since they were of similar hp ratings. The tall boy would be an easier engine to produce since it did not have the spiral cam gears. Brian, as you know, the cast-in perforated metal cooling fins was Messers patented design.
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Old 05-30-2016, 05:39:05 PM
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Default Re: 5 hp Myrick forge blower engine restoration-it's alive!

Well, it was a good day. I got the engine finished and tried over the last 3 weeks to get it going...zip...nada...sore arm. Something was just not right with the fuel/air mixture. Tried putting a rubber seat on the mixer valve which draws in fuel and air thinking it was leaking too much fuel and flooding...nope. Then I got the idea to use a demand regulator hooked to the fuel line to drop the pressure so it only got fuel on the intake stroke. Viola...success. Ran it for about 5 mins to warm it up then stopped. Another crank, and it started right up. Still some extra oil in the cylinder crapping up the plug, but this will pass. At least now it runs.
Here is the video: https://m.youtube.com/watch?v=DyHwKfbcQEY

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