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Gray Double Cylinder Model "U" Gray F...

Old Marine Engine » One and Two Cylinder Gas Inboards » Gray Double Cylinder Model "U" Gray Flyer « Previous Next »

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warrene77
Advanced Member
Username: warrene77

Post Number: 32
Registered: 04-2013
Posted on Monday, February 18, 2019 - 12:06 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I bought my Double Cylinder “U” Gray Flyer from Richard Day approximately 2014 and have been trying (off and on) to get it running ever since. Recently succeeded! You can Google “gray flyer running 2 7 19” if you like.

I initially took it apart for inspection and to re-seal the patch on the bottom of the crankcase. After re-assembly, I tried to get it running without much luck. I had never heard of a 3 port engine so read everything I could about it and then became fixated on the vacuum/compression requirements of the crankcase so worked too hard on that. When turning the engine by hand I could detect only a very slight intake to the carburetor so my concern about the crankcase operation continued.

At some point I noticed that of 18 bolts fastening the block to the crankcase one was shorter and I realized it was for the point above the center bearing grease passage! Painted the head red and put it there so as not to block that passage.

In response to some of my questions on “Old Marine Engine” forum I was advised by JB to remove spark plugs and turn the engine and listen to the “poof” when cylinder full down (compressed air from crankcase entering combustion chamber) but I could never be certain that I was hearing it. Eventually, I replaced the piston rings and had to “run ‘em in” so tried belting the flywheel to my drill press and that worked (cheap, easy – doubted it would work - but it did!). Then, at 100 rpm I could definitely detect the carburetor intake and hear the “poof”. Happy boy!

Next was a trial run. It ran well maybe 20 seconds and died. What now? I noticed a bubble in the fuel line just below the tank but “assumed” fuel would flow past that. I tried again the next day with the fuel tank 2" higher and more fuel in it and it “started easily and ran well”. No bubble appeared.

Next, I’ll get the water pump working well, re-work the fuel supply line, and tidy up the ignition wiring (when the weather warms up a bit!).
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billschaller
Senior Member
Username: billschaller

Post Number: 699
Registered: 12-2003


Posted on Tuesday, February 19, 2019 - 07:59 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I have one or two of those waiting for a restore. Thanks for your info, and I liked your video. Also, I just happen to have the same weights on my snow blower.

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