When I put a short plug in the head it flipped with pretty good compression even with the crumbly gasket. For some odd reason I expected it to be 5/40. I finally put a prop on after rummaging around for a hex nut and a washer that fit. When I reassembled the engine it turned smoothly. I cleaned up every thing inside with the solvents on hand, q-tips, and soft cloth. I needed to cut a new paper gasket for that since the old one came out in pieces. 049 wrench that is sometime used to remove the Cox cylinder at the exhaust slots when there are no flats on the top fin. The gasket inside the head is a bit crumbly bit still seals I wonder what it is made of? Almost looks like ancient rubber! I opened the backplate with end of a Cox. Get ready to cringe, but since this engine already had some wrench marks on the aluminum head and the cylinder fins, I got the cylinder off with an old pair of pliers and a bit of chamois between the nut busting teeth and the fins. The wooden wrench trick might work on the cylinder, but it is very tight between the and intake stack and it will take some thought. 061 wrench a bit (its soft and easy to do) it can be used to take the head off. I found that by spreading the business end of an AP. Since I don't have any Wen Mac tools here's what I managed to do to free it up and take it apart:Īfter two weeks soaking in powersteering fluid and penetrating oil I could turn it over at the prop nut with my fingers. Here are some disassembly hints based on being sent a thoroughly gummed up Mk III by my nine year old son who bought it for $3 at a church rummage sale. (I used to use a shortened ball point pen spring ) but none of the ones I ever got had one either? I think there's supposed to be a spring on the N.V. to fit.I don't know if they were all the same size, or if there were variations?) The flywheel that's on there now is pressed on and yep, the crank is splined.(I hope the crank splines on yours and the hole on the flywheel/one way I gave ya is the proper dia. I think that lower pin is a locating pin.and I believe that rear recoil housing had one still stuck in it? There might be a hole in the front of the venturi, just above the spraybar where the upper rivet/pin (whatdidyacallit?) holds the R. There is also a copper gasket at the cyl. IIRC the gasket is black, and relatively soft, like perhaps asbestos treated with that black kind of slightly rubbery whateveritis? it's just basically the head that threads down over the steel sleeve. There should be a gasket up inside the alum. I wish I had a Wen Mac wrench for ya.but. is screwed on, as is the lower steel part, down into the case. When the backplate is off, do I drive out the crankshaft like on a Cox? Is it splined? Was there ever a spring to keep the needle valve tight on these early ones? There is nothing to keep the needle from free turning on this one. It must be just to keep the recoil from spinning and not to hold it to the case. If you look close you can see it in the first picture. It appears it is simply a pin, no type of head on it. There is a pin already in the crankcase casting. Is any of this possible with the Cox varieties like the backplate? I would hate to chew this thing up with the wrong wrenches. All that I have in my collection is just about every Cox wrench made, but no Wen-Mac style. I think I might have to hunt for a Wen-Mac wrench now. Is this simply an aluminum sleeve that is shrunk on or is it screwed into the steel? Another question would be where do you wrench this thing? Would I need a wooden block and a vise to grip the cylinder? After I cleaned it in the Hoppe's it brightened up a brass or copper gasket under the cylinder I hadn't seen also. The upper cylinder is all aluminum with the base of it being steel. I see there are two sections to the cylinder. Now comes the time to fit the parts you sent, but I would like to dis-assemble the case, cylinder and piston but I've never had one apart before and don't quite know whats involved. 9 gun cleaning fluid and it cleaned up very nicely. The eBay win came in yesterday and it spent a half day soaking in Hoppe's No.
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